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Fn 3,4 & 6 Ghosh 1st Attempt (All Cleared) ORAL @DG, DATED 12.04.12 SURVEYOR – INTERNAL- MR. BANARJEE, EXTERNAL-MR. GHOSH FN-3, 4B, 5 Function 3: 1)ship is loaded upto 90 to 95 %.now bad weather and ship is rolling n pitching, so what arrangement in oil tanker is provided to avoid this excessive sloshing on. 2) tank gauge and UTI? 3) What is MRCC? 4) draw rudder. 5) What is rise of floor, what is its use . 6) what is multigas detector and any other method of instrument for checking gas? 7) what are ambient limitation of using isotrope for co2 measurement? Function 4b : 1) pitting of main bearing, reasons? 2) Diagram - automatic air starting valve 3) If fuel injection starts late and ends early, what is the problem. 4) what is underslung crankshaft. draw and explain as to which component takes the load. 5) power diagram and indicator diagram 6) a/c and refrigeration expansion valve difference? 7) t/c casing hole and bridge not ready to reduce rpm, how will u manage? RESULT- CLEARED FUNCTION 4B AND 5 FIRST ATTEMPT 11 April,2012 Fn 3,4 & 6 All Cleared SURVEYOR - Mr. GHOSH Function 3 : 1)ship is loaded upto 95 %.now bad weather and ship is pitching (said specifically not rolling) so oil is sloshing on the forward side of the transverse bulkhead, so what arrangement in oil tanker is provided to avoid this excessive sloshing on the transverse bulkhead. 2) What is rise of floor, what is its use. 3) What is MRCC 4) In scrubber tower after IG passes through will the oxygen content increase or decrease and explain why. 5) How to check CO2 level by radio Isotope method. Function 4b : 1) Diagram - automatic air starting valve 2) If fuel injection starts late and ends early, what is the problem. 3) what is underslung crankshaft. draw and explain as to which component takes the load. 4) M/E bearing removal of RTA engine Function 6 : 1) How is the overboard valve connected to hull 2) P/V valve stuck, what will you do.too much cross questioning. 3) M/E T/C casing, water side leaking. how will you go about solving the problem.(CONDITION :- The load of the engine cannot be reduced) 4) While tightening TIE RODS, what lubricant will you use on the threads before tightening. explain why and what will happen if oil is used. 5) Ship in drydock you found that pipe after the boiler water circulating valve is corroded badly, you have to change the pipe what pipe will you use and lots of cross questioning. 6) ASKED ABOUT CHAIN BLOCK - FUNCTIONAL DRAWING AND EXPLANATION 7) TURNING GEAR MOTOR REMOVED FOR OVERHAUL ,TURNING GEAR INTERLOCK SWITCH ALSO REMOVED FOR OVERHAUL. CONDITION:T/G IS ENGAGED NOW AND IF SOMEBODY GIVES AIR START TO THE ENGINE WHAT WILL HAPPEN TOLD TO WAIT OUTSIDE, DUTTA SIR WILL COME AND ANNOUNCE THE ORALS, AFTER 1/2 HR DUTTA SIR CAME AND ASKED ME TO FOLLOW HIM TO HIS CABIN. THIS IS WHERE MY SECOND ORALS STARTED. 1) Propeller removal procedure 2) Propeller inspection 3) How will you check propeller drop 4) How will you carry out sea chest inspection RESULT: ALL CLEARED SOLUTIONS FUNC 3: 1) Deck transverse webs are provided to avoid this sloshing effect. Diagram - DJ EYRES sixth edition pg no 254. 2) RIse of floor - rise of bottom shell plating line above the base line. Diagram - DJ EYRES - pg no 13. its use is since it is a rise it will cause all the sea water in the ballast tanks to accumulate on one side from where the suction to the ballast p/p is provided.
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Fn 3,4b & 6 Updated April,2012 (MEO Class II)

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Arpit Goyal

Compiled Ques & Ans of Orals held in March-April,2012.
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Page 1: Fn 3,4b & 6 Updated April,2012 (MEO Class II)

Fn 3,4 & 6 Ghosh 1st Attempt (All Cleared)

ORAL @DG, DATED 12.04.12SURVEYOR – INTERNAL- MR. BANARJEE, EXTERNAL-MR. GHOSHFN-3, 4B, 5

Function 3:1)ship is loaded upto 90 to 95 %.now bad weather and ship is rolling n pitching, so what arrangement in oil tanker is provided to avoid this excessive sloshing on.2) tank gauge and UTI?3) What is MRCC?4) draw rudder.5) What is rise of floor, what is its use .6) what is multigas detector and any other method of instrument for checking gas?7) what are ambient limitation of using isotrope for co2 measurement?

Function 4b :1) pitting of main bearing, reasons?2) Diagram - automatic air starting valve3) If fuel injection starts late and ends early, what is the problem.4) what is underslung crankshaft. draw and explain as to which component takes the load.5) power diagram and indicator diagram6) a/c and refrigeration expansion valve difference?7) t/c casing hole and bridge not ready to reduce rpm, how will u manage?

RESULT- CLEARED FUNCTION 4B AND 5

FIRST ATTEMPT 11 April,2012 Fn 3,4 & 6 All ClearedSURVEYOR - Mr. GHOSH

Function 3:1)ship is loaded upto 95 %.now bad weather and ship is pitching (said specifically not rolling) so oil is sloshing on the forward side of the transverse bulkhead, so what arrangement in oil tanker is provided to avoid this excessive sloshing on the transverse bulkhead.2) What is rise of floor, what is its use.3) What is MRCC4) In scrubber tower after IG passes through will the oxygen content increase or decrease and explain why.5) How to check CO2 level by radio Isotope method.

Function 4b :1) Diagram - automatic air starting valve2) If fuel injection starts late and ends early, what is the problem.3) what is underslung crankshaft. draw and explain as to which component takes the load.4) M/E bearing removal of RTA engine

Function 6 :1) How is the overboard valve connected to hull2) P/V valve stuck, what will you do.too much cross questioning.3) M/E T/C casing, water side leaking. how will you go about solving the problem.(CONDITION :- The load of the engine cannot be reduced)4) While tightening TIE RODS, what lubricant will you use on the threads before tightening. explain why and what will happen if oil is used.5) Ship in drydock you found that pipe after the boiler water circulating valve is corroded badly, you have to change the pipe what pipe will you use and lots of cross questioning.6) ASKED ABOUT CHAIN BLOCK - FUNCTIONAL DRAWING AND EXPLANATION7) TURNING GEAR MOTOR REMOVED FOR OVERHAUL ,TURNING GEAR INTERLOCK SWITCH ALSO REMOVED FOR OVERHAUL. CONDITION:T/G IS ENGAGED NOW AND IF SOMEBODY GIVES AIR START TO THE ENGINE WHAT WILL HAPPEN

TOLD TO WAIT OUTSIDE, DUTTA SIR WILL COME AND ANNOUNCE THE ORALS,AFTER 1/2 HR DUTTA SIR CAME AND ASKED ME TO FOLLOW HIM TO HIS CABIN.THIS IS WHERE MY SECOND ORALS STARTED.

1) Propeller removal procedure2) Propeller inspection3) How will you check propeller drop4) How will you carry out sea chest inspection

RESULT: ALL CLEAREDSOLUTIONSFUNC 3:1) Deck transverse webs are provided to avoid this sloshing effect. Diagram - DJ EYRES sixth edition pg no 254.2) RIse of floor - rise of bottom shell plating line above the base line. Diagram - DJ EYRES - pg no 13. its use is since it is a rise it will cause all the sea water in the ballast tanks to accumulate on one side from where the suction to the ballast p/p is provided.

Page 2: Fn 3,4b & 6 Updated April,2012 (MEO Class II)

3) MRCC - MARITIME RESCUE CO-ORDINATION CENTRE. Centres are in UK AND SINGAPORE. During distress and alert signals, these centre are notified and they provide the information to the ships nearby agencies for rescue. They operate 24*7*365 days.4) In scrubber tower the o2 content increases because when s.w ( at around 30 deg ) cools the inert gas the dissolved oxygen get converted to gas by taking the heatt from the gas. (same is the reason why hotwells for boiler water tank are operated at high temp)5) CO2 LEVEL MEASUREMENT - http://en.wikipedia.org/wiki/Geiger_counter

FUNC 4B :1) DIAGRAM - Automatic air starting valve - Lambs pg no 296 - note the spring is not shown in the diagram. you have to show it while drawing in the exam.2) FUEL INJECTION STARTS LATE AND ENDS EARLY- Problems are fuel cam worn out- fuel p/p rollers are worn out- and in case of 4 stroke - push rods worn out, in some fuel pumps to adjust timings shims are added on the top of the roller arrangements, those shims are very small (different sets are provided 0.1 mm, 0.2 mm, o.3 mm) and since these shims are very thin, sometimes they break.3) UNDERSLUNG CRANKSHAFT:http://www.marinediesels.info/4_stroke_engine_parts/The_4_stroke_engine_frame.htm4) RTA - MAIN BEARING REMOVAL - As per manual

Geiger counter - Wikipedia, the free encyclopediaen.wikipedia.orgA Geiger counter, also called a Geiger–Müller counter, is a type of particle detector that measures ionizing radiation. They detect the emission of nuclear radiation: alpha particles, beta particles or gamma rays. A Geiger counter detects radiation by ionization produced in a low-pressure gas in a G...

y lubricant will have its own friction value and the tightening values are mentioned with respect to the lubricant used............if another lubricant is used the tightening value will change and you can overtighten or undertighten the tie-rod.5 - change the pipe. the pipe should be of the same dimensions as the previous one......same in thickness.....cross Q :how will you know the thickness, the pipe is corroded......my ans- sir will check the pipeline diag .......cross Q - ship is old dont have any diagrams......my ans - sir will check the inner dia of the pipe and compare it with the values from the IMPA CODE BOOK, and will come to know which schedule pipe is used........cross Q - IMPA CODE book not present what then .......my ans then from experience SCH 80 or SCH 160 .......cross Q - do you know the cost of SCH 80 / SCH 160.......you will fit any pipe anywhere.......my ans - sir this pipe has to withstand high temperatures and pressures and if the last pipe used was corroded so badly will certainly ensure that this should not happen next time during voyage and hammper the watertight integrity of the ship so goin to a higher schedule should not be a problem. no reply

The piece that connects the ovbd to the hull is called the stub piece...any sorta work to do with these pieces involves the class approval and the class surveyor to be present while the repair work is being carried out,we jst had a leaking stub piece rectified.il try n find out about the schedule of the pipe.shoudnt it be the same as the pipe that follows after the valve...probably we could jst remove the pipe ahead of the valve and measure its thickness although it would not be possible always...il still find out.

Fn 3,4 & 6 Ghosh

FUNC 6:1 - Overboard valve connected with the help of stiffeners and since you have made a hole in the side shell plating affecting the strength, means should be provided to compensate for that a insert plate welded on the inner side and then means provided to connect the pipe (TO MAINTAIN WATERTIGHT INTEGRITY - GIVE A STRESS ON THIS POINT) .....arrangement for my ship was......one pipe passing till the end of the bulkhead, one insert plate welded, then four strengthing members welded at right angles to this pipe i.e top, bottom,port n stbd sides. And if boiler blowdown pipe is fitted insert plate welded at both sides (inner side of the side shell plating and the outer side of the sideshell plating)2 - P/V valve stuck - i said manual indication is provided as the p/v is operating or not, and if stuck then lift it manually........but his cross question was what if all tanks P/V valve got stuck what wiil you do now..... my answer in each tank second means of protection provided P/V BREAKER so it will compensate for the overpressure or underpressure...cross Q - but on chemical tankers if you carry different cargo in diff tank then mixing of vapours will be hazardous so in that case what will you do.....my ans - sir now a days in new ship each tank P/V valve is incorporated with an HIGH VELOCITY VENT V/V....cross Q - if old ship dont have that arrangement what then ........and i was like sir good question....NEXT3 - M/E T/C Casing water side leaking - immediately inform bridge and tell to reduce the load.....cross Q -Captain says sorry not possible what next.....my ans - close the water supply to the T/C run it as uncooled T/C......drain the T/C ensure no water accumulation in the T/C....cross Q - so blades will be overheated what then .....my ans - sir make some cooling arrangement give control air supply line to the T/C CASING ......cross Q so you will allow to run the main air comp continuously.....my ans - (thinkin atleast till now the right approach) so after thinkin for a while answered ......sir tap a line from the scavenge air manifold and supply it to the T/C....agreed no more cross Q4 - the lubricant to be used will be mentioned in the manual.......bcos.....ever

First attempt 11 April,2012SUrveyor Mr Ghoshasked me what type of ships U hv done reply 1 oil & then 1 Gashe said I'll go out to lit a cgi meanwhile u draw x-section of gas carrier & AVR

fn 3

Page 3: Fn 3,4b & 6 Updated April,2012 (MEO Class II)

Fn 3,4 & 6 Ghosh & Dutta

1) X-section of gas carrier, I hv drawn a LPG tank but not shown secondary barrier told him no primary & secondar bariers. actually temp below -55 so hull can be secondar barrier so totally wrong in concept2) SCABA bottle wen do u pressure test? reply was during evry fire drill okthen wat is the speciality abt the compr ans was it will have canister filter at the delivery which turns frm green to red when filter is choked. satisfied wid that before that I told all bullshit that it is 3-stage compr at deliver ratings upto 300 bar not interseted in all this stuff3) what is the m/l of gasket/joint used in gas carrier? no ansactually this 1 q gave him the complete impression abt my gas knowledge that I know nothin. acc to my 2/e its a sin ot to know4)what is ship squat? told him in layman words but needs xaclty what is the conceptso told me u didn't got the concept right so wrong there5) radio isotope co2 level measuring: told him how it done & temp. I was having 2 temp in mind 32 & 40 but asked me to stand on 1. so told him 32 as it is the critical temp. but shld hv told him 32 is not possible as ambient T @sea, so 40 is used.correct me regarding this but he is ok wid my ans

fn41) indicator diagram & cross q's2) what is the use of regenarator & ref compr in IG of gas carrier--gone wrong wid thatafetr that there were some regular motor stuff which I did ans but no ans to gas carrier part like cat fines & their origins etc

fn61) centrifugal p/p clearance & show in fig.----ok wid that2) draw flaring tool & usage ---- showed him k wid that3) why slow turning of cargo p/p's in gas carrier--no idea its actually suicidal ans4) how will u test cargo condenser leakage --- told him the regular condenser stuff actually not that way

result is obvious --- washout he said I cant let a gas guy this wayactually got LPG x-section wrong there is a centre line blkhd to reduce sloshing wid a equalizing v/v didn't shown that

DATE: 10/04/2012PLACE: D G SHIPPINGINTERNAL EXAMINER: MR. DUTTAEXTERNAL EXAMINER: MR GHOSHFUNCTIONS APPEARED FOR: 3, 4, 5 & 6RESULT: Cleared Function 5 & 6

It all started @ 10 AM with Going to MMD n then signing the register n ended with Oral @ 5PM...The information stored in the brain for the last couple of days was wiping out very fast as the oral got delayed and the way Mr. Gosh was asking questions to candidates and their failing rate added to my nervousness. Anyways the end result was good…Opening acchi hui :)Mr Gosh was taking orals in a separate room, He is not like others who demoralise you or shout at you, so no need to panic, He asked me all the questions from his “QUESTION BANK” paper that he has got!As soon as I entered his cabin he told me that he’s going out to smoke, till that time to keep me busy he asked me 3 questions & told me to answer them in not more than 10 minutes.1) Draw CLASS B RudderI drew Spade Rudder but didn’t know the location of key as as far as I know then transmission is through bolt located below pintle but he said your drawing is wrong as you’ve not shown any key or rudder stock bolts so this answer was wrong2) Draw AVRI drew the one given in macgeorge, labelled the drawing exactly as given in macgeorge so no issues with it, my first right tick \m/3) 2 stroke engine, N- 1400 RPM, Fuel Inj start: 15.5 BTDC, Fuel Inj End: 5.5 ATDCWhat will be the Fuel injection time (Sec.) in 1 revolution?Ans: Total time to complete one revolution = 60/1400 sec.Total Fuel Inj Time: 15.5+5.5=21 degreesSo 360 deg is 1 rev then 21 deg will be 21/360 revTime of fuel injection in 1 rev is (60X21)/(1400X360)i.e Ans: 7/2800 sec He said its correct and made right tick against it.

Function 31) What is rise of floor? And after answering this next question was its use?Drew the diagram but didn’t know its use. So answer was wrong as I could not answer the later part.2) Have you ever been to dry dock?No.3) What is MERR (M not sure if it’s MERR or some other word)I said don’t know.4) What is heavy weather hold ballast?I answered as it is done in hatches to submerge propeller and for stability then started the cross questions series…any speciality? I said ballast pump line and strength is increased compared to other hatches & we can isolate alarm for hold flooding for that individual hold but he wanted more so again cross mark.5) SCBA bottle why it is not charged with MAC?I said its pressure is high then asked me what else I said air quality ‘cause MAC oil carryover but he said even the SCBA comp has got oil I said it’s the special filter cartridge that purifies air of dirt and oil then he was satisfied so that was the only correct answer in safety.

Page 4: Fn 3,4b & 6 Updated April,2012 (MEO Class II)

Fn 3 Pakrashi

6) How to check CO2 level by Radiation Isotope?This I answered with Gieger method but he wanted that fixed temperature so cross marked.

Function 4 1) Draw Indicator card, explain all the curves with atmospheric line and clearance volumeDrawing was perfect then told me to explain the 2 stroke cycle with indicator card.Then show what happens to diag if fuel valve leaking, piston ring leaking and then what happens with exhaust valve leaking I said for the exhaust valve I think its same he said wrong so again cross.2) If fuel injection starts late and ends early, why?I could not answer as whatever I said he said NO3) Draw diagram of Fuel Pump or Fuel Valve or Automatic starting air valveI said I’ll draw sulzer ka fuel pump, but as soon as I finished drawing spill valve side he said no need to draw other half as I could make out from this side the condition of your other side and showed me the drawing of fuel pump drawn Lokesh lamba. I could make out from it that how pathetic my drawing was so again a cross.4) Difference between expansion valve of A/C and that of Refrigeration plant?He wanted constructional difference as he is more interested in practical knowledge than the theoretical. I didn’t know. :(He said 2-3 times that I don’t like mugging up and m against asking Rules and regulations, you should know practical things so this way he took away my tension of answering all those rules regulations questions. :)Till now I had answered as per my ability but looking at the number of crosses It was damn disappointing but he said ki you have studied the things but you are still lacking somewhere.

Function 61) How is the overboard valve connected to hull?I showed him the drawing then he asked me how you order the pipe between the valve and hull if you know only OD of it? He said this answer is half wrong half correct as I could only draw it.2) How you’ll come to know that M/E air cooler tube is leaking?I said take out end covers and then fill the air side with water the he asked me how you’ll fill the water, my reply was by Air cooler cleaning line a FW connection provided then was his next question was how to check for lub oil cooler then? But I could not answer his cross questions3) Why and where Flash back arresters are provide and its construction?Got it right4) What is Hardness and how to check it? Its units? If I have one of 200BHN & other of 400 BHN then which is harder and why? I said its 200 as BHN no depends on area of indentation so less the area less the number & harder the material.5) How and where to check clearances in CF pump and after answering it the cross question was how to box back the rings and impeller in other half of the casing where my answer was not that correct.

So he said I have performed well from a freshers point of view. He’ll give me function 5 and put a question mark against 6 and said he’ll talk with Internal Mr.Dutta to see what can be done about function 6 & told me to wait outside. After 5 min Mr Dutta called me in his cabin and asked me engines I have worked on and only 1 question, where do we use paper, molycoat, grease? I said its some uses of them and said its for sealing then he told just to say for sealing no need of telling the other things and said I have to repeat 3 & 4 and m passing you in 5 & 6 :)Thank you all of you for posing your questions and matter related to it.Wish you all, best luck in your exams! Cheers!!

21/12 pakrashi/ banerjee ONLY PAKRASHI TOOK ORALSFunction 3

1) what q u could not answr lastime?told him CSR , what is the sealing between tank and hold space in gascarriertold me to tell the ans

2) csr comes under which code? ans- ispsinorder for issue of interim international ship safety certificate should CSR be present on board? told him no.CSR should be placed on bord during the 6 month validity of interim certificate.he asked is CSR mandatory? said yes. no ISSC will be issued without CSR. he asked when will interim certificate be issued? told himduring interim certification only the objectiives of isps to be achieved. then he said wat else requirements to be satisfied for interim certification? told the follans-An Interim International Ship Security Certificate shall only be issued when the Administration or recognized security organization, on behalf of the Administration, has verified that:

.1. the ship security assessment required by this Part of the Code has been completed;

.2. a copy of the ship security plan meeting the requirements of chapter XI-2 and part A of this Code is provided on board, has been submitted for review and approval, and is being implemented on the ship;

.3. the ship is provided with a ship security alert system meeting the requirements of regulation XI-2/6, if required;

.4. the company security officer:

Page 5: Fn 3,4b & 6 Updated April,2012 (MEO Class II)

EEDI & Propeller Designs (Pakrashi) compiled by Arpit

Goyal

Main Bearing Material Properties

.1. has ensured:

.1. the review of the ship security plan for compliance with this Part of the Code;

.2. that the plan has been submitted for approval; and

.3. that the plan is being implemented on the ship; and

.2. has established the necessary arrangements, including arrangements for drills, exercises and internal audits, through which the company security officer is satisfied that the ship will successfully complete the required verification in accordance with section 19.1.1.1, within 6 months;

.5. arrangements have been made for carrying out the required verifications under section 19.1.1.1;

.6. the master, the ship security officer and other ship’s personnel with specific security duties are familiar with their duties and responsibilities as specified in this Part of the Code; and with the relevant provisions of the ship security plan placed on board; and have been provided such information in the working language of the ship’s personnel or languages understood by them; and

.7. the ship security officer meets the requirements of this Part of the Code

3)ism validity of doc and ismc(12 mnths and 6mnths). what happens when a non confirmity is found? told him if non conformity it has to be downgraded and rectified and peventive action to be taken to prevent reoccurance. (use these words he is particular) what happens when MNC is raised in DOC? told DOC is withdrawn and all smc"s assocoated with it will be withdrawn. then he said what happens after that? told him MNC downgraded rectified and preventive action to be taken to prevent re occurance. then what certificate is issued? told him DOC and ISMC.( dont tell interim certificates will be issued)

4) told me to draw crosssection of gas carrier(as i had done gas carrier)types of tanks in gas carrier, insulation material and tank material(only basic in the drawing i showed)5) how bulkheads are attached? what is the name of corrugated bulkhead?what is the stiffening in a bulkhead stool?GUYS I WAS WELL PREPARED IN ISM AND ISPS HE WAS VERY SATISFIED. PLEASE READ THESE CODES WELL IF YOU GET PAKRASHI.CLEARED CLASS II THANKS TO GOD AND THIS GROUP KEEP SHARING..........

if you read csr it says it should contain at least the foll info stated under csr. any info other than that wil be as per the requirement of admin. as per bakral last 10 ports of call should also be recorded in csr

Lenon Colaço actually chapter XI requirements on safety and security began after september 11 2001 attacks and was divided in two parts safty and security and entry in force july 2004. both the chapters go hand in hand and deals with safety and security.

how propeller designs are modified to comply requirement of eedi?..... anyone?

Karthik ReddiarLarger propeller diameter involving:Higher propeller efficiencyLower optimum propeller speed(rpm)Lower number of propeller blades involving:Slightly higher propeller efficiencyIncreased optimum propeller speed(rpm) (from 6 to 5 blades means approximately10% higher rpm)

Karthik Reddiar that is where ultra long green engine known as G-ME was introduced.rpm reduced nd large propeller dia with optimum ratio ofthe propeller pitch and propeller diameter.

Ashish Agrawal kartik , he told me two method after i was finished with my reply...i.e. propeller boss fins and skewed propellers...also told there are other too...

3)EEDI- what is it, i said...ghg and concerns of co2 emission related to it...then asked how propeller designs are modified to comply requirement of eedi....i said may be an inclined geometry with larger dia.....not satisfied.

Page 6: Fn 3,4b & 6 Updated April,2012 (MEO Class II)

C02 Radio Isotope Method & HP,MP,LP Pipes

BRG MATERIAL

Properties of main bearing materials

It must be anti friction resistantIt must be of anti corrosive typeGood running in and grinding in abilityGood load carrying capacityGood embadibility propertyMust support the oil filmGood tensile and compressive strengthMust not react with the lube oilIt must have thermal resistant property to avoid any damage in case it’s running hot

Types of Main Bearing

1. Lead Bronze Bearing: This bearings consist of the following layers

Flash layer: It is the top most layer with thickness of 0.035mm made up of tin and lead. It is used to protect the bearing from corrosion and dust when not in use. This layer flashes off when bearing is running.

Nickle Barrier: It is the second layer made up of nickel with thickness of 0.02mm. Its main function is to prevent corrosion and avoid diffusion of tin into bearing metal.

Lead Bronze: The third layer composed of lead bronze which has an excellent anti seizing property and is the principle component which acts as a bearing out of all layers.

Steel back: Steel back is the last and backing part of the bearing used for shape and support over which all the layers are bonded together.

Gudgeon Pin bearing in a 4 stroke engine is usually made of lead bronze bearing and also used for main bearing for smaller engines.

2. Bi-metal Bearing: This bearing consists of following layers

Aluminium Tin: The first layer of bi metal consists of Al and Sn with thickness of 0.5 to 1.3mm and this is the main element of this type of bearing.

Bonding Layer: The bonding layer consists of aluminium and it is 0.1mm thick. The main function of the bonding layer is to obtain a good bond between the shell and the top layer.

Steel Back: The backing part used for shape and support.

This type of bearings are used in 4 stroke engine main bearings

3. Tri Metal Bearing: These bearings are called tri metal bearing because they consist of three main layers (excluding flash layer as it flashes off) and a steel back. It consists of-

Flash Layer: It is the top most layer with thickness of 1 micron made up of tin and lead and used to protect the bearing from corrosion and dust when not in use. This layer flashes off when bearing is in Running in period.

Overlay: The second layer made up of white metal (Tin Antimony Copper) which is the main component in this type of bearing. Its thickness is 20 microns.

Interlay: It is the third layer used as anti corrosive layer for overlay. It is of 5 microns thickness.

Lining: It is the lining layer between interlay and steel back with thickness of 1 mm made up of lead and bronze.

Steel Back: The backing part used for shape and support.

Used in 2 stroke Main bearing shell

Bhai log today had my orals and Mr Ghosh took da orals All the questions were almost similar for all candidates one special question was CO2 LEVEL checking by isotope method....My answer cud not satisfy MR. Ghosh I said one Gieger Method to check by isotope...if

Page 7: Fn 3,4b & 6 Updated April,2012 (MEO Class II)

Ref & AC Discussion

search on net u'll get the info about it...Till this he was ok bt what he told after that ki "in this method temperature is very important...u have to maintain temperature of bottles low...at low temp Co2 is in liquid form in the bottles so either you cool the co2 room somehow by putting a cooling arrangement or by any means. N i forgot to tell him da safety precautions regarding this method that we hv to blank da main line remove the links isolate the Co2 system n all dat stuff bt got a big cross cause i cud nt explain dat temperature part bt i hope this Gieger word will lead you somewhr!! Rest all questions U can find in others post for todays orals...m extreamly sorry i cant post you my orals question now as m havin severe headache tomm i'll pakka post thm...ths co2 guys giving orals tomm ...All the best n cheers!!!

PLS ANSWER..FOR..CO2 SYSTEM L.P. PIPE,M.P. PIPE, H.P. PIPE LOCATION PLS

(i) The piping must be pressure tested as follows: -1) The high pressure section up to and including the engine room, boiler room or pump room stopcock and up to and including the operating valves or cocks to the cargo holds:At a pressure of at least 190 kgf/cm2 using a suitable liquid.2) The medium pressure section (open ended pipes where they run through accommodation spaces, together with the section of the main supply line running to the engine room, boiler room or pump room between the stopcock and the room concerned):At a pressure of at least 80 kgf/cm2 using a suitable liquid.3) Low pressure section (other pipes with open ends):With air at a pressure of at least 6 kgf /cm2Pipes running from the pilot cylinders to the servo-cylinders and the sections of pipes to deep tanks, which can be shut off, must be considered as part of the high-pressure system. Pipe sections and valves tested hydraulically with water must be blown dry with air.

Why do we have differntial cutout in reefer comp? what r the values?

Capacity control of reefer compressor is done by pressure switch in the suction line of comp, when one of the room solenoid valve closes the refrigerant supply , this causes suction pressure to drop. the press sw senses this and activate unloader through a solenoid valve which supply LO to unloader. the unloader is inthe form of lever which lift the suction vlave of one of the unit of comp.

Navinkumar Rajput generally liq reft is charged at the charging connection before filter/dryer n after condensor. firstly start comp, close the outlet valve of the condensor and collect the reft in the condensor till LP cutout. connect one connection of tee joint with valve to the recovery bottle, one to the freon bottle and third to charging connection. hang the freon bottle on weighing scale. open the valve of tee joint connected to freon bottle n recovery bottle then open gas valve of the freon bottle to remove the air in the line to recovery bottle then close all vlave. open freon bottle liq vv and vv at charging point and start the compressor. check the level in the condensor n fill to half to 2/3 gauge level. then stop comp and close all the valve. check in the weighing scale how much is charged.

Navinkumar Rajput liq fill valve is painted blue and gas in red. never charge liq from gas charging connection in the suction side of the compressor

X Rayy Dawgg the return pressure acts on the luboil in your sump,so the pressure being shown on the lub oil pressure guage is the sum of the return gas pressure and the pressure developed by the pump itself,but what we need is the pressure being devoloped by the pump only,cauz it has to supply against the gas pressure inside the crank case too,while it is supplying oil to the crank pin and main bearings,and your differential pressure trip is for this purpose,to sense the actual LO pressure developed by the pump,which will be the LO pressure being shown by the guage minus your return gas pressure

X Rayy Dawgg i think the value should be above 1.5 bar

Mayuresh Upadhye any diff betwn ac and reefer systems?

Mayuresh Upadhye why the suction press acts on the c/c? is it connected, or due to piston ring leakage? where does the outlet of condensor relief v/v go to?

Shardul Parab Refrigeration and Air ConditioningWhile the principles behind refrigeration and air conditioning are similar, there are certain basic differences:• Temperature: For human comfort, air conditioning needs a standard temperature of 22°C. In refrigeration the temperature can vary from minus 30°C to +25°C, depending on the cargo

• Cargo: Humans and live animals use air conditioning, but refrigeration is used for non- living cargoes or live plants.

• Humidity: For human comfort, air conditioning requires a certain humidity range, but in refrigeration, the level of humidity required depends entirely on the cargo. For some cargoes the presence of humidity will even be harmful and they must therefore be maintained in a humidity-free condition.

•Air Purification: An air conditioning system requires that the air is filtered and purified continually to remove odours and dust particles, using enzyme, mechanical and bio-filters. Refrigeration systems only require the same volume of air to be cooled and passed through the cargo compartment in order to maintain the desired temperature.

Page 8: Fn 3,4b & 6 Updated April,2012 (MEO Class II)

Fn. 3, 4 & 6 Pakrashi

Ques. Fn. 6 compiled by Arpit

Goyal

Fn. 3 & 6 Pakrashi

• Fresh Air Requirement: An air conditioning system demands the circulation of a certain volume of fresh air containing 20.9% O2. If fresh air is not provided, after a short time the O2 in the room's atmosphere will be depleted and replaced with CO2. This makes it initially uncomfortable and then unsafe for human occupancy. Although the air conditioning is controlled with the correct temperature and humidity, at the end of the day the room will feel stuffy as the amount of CO2 will have increased significantly. A certain degree of fresh air (and air movement, see below) is needed to replenish the consumed O2. In refrigeration, the timing and the amount of fresh air required strictly depends upon the cargo, as some need fresh air and others do not.

•Air Movement: Air movement is required for air conditioning in a closed room, as to keep the occupants cool the air needs to be circulated continually. In refrigeration, air movement is controlled by the temperature that is needed to be maintained (ie the demand temperature or thermostat set-point). Once the desired temperature is reached, the air movement simply stops.

Mayuresh Upadhye thx, but i wanted to know any diff in the vapour compression cycle, like parameters, or other device..in addition to air handling unit..

X Rayy Dawgg Mayuresh Upadhye,The return gas is connected to the crank case yaar,This helps ur Luboil to be cooled..and the basic difference between AC and Refer Compressor is AC compressors usually have capacity control,which adapts the same method to cut off the units which i have mentioned earlier,rest all are the same

03/04/2012 External PakrasiFunction 4B:1. Turbocharging and superchargingDifferent types of superchargingand stuff2. Different models released by Sulzer before RTA3.Indicator cards various diagrammes and stuff

Function 3:Some stuff about all conventions dont really rememberMLC and ILO conventions and importance of thoseDifference between Statutory certificates and class certificates

Function 6:Air conditioning, how do you maintain temperatures and RH.What are medical implications of excessive dry air.What is the material of insulation of roomsAnchore chain, types of chain? can u draw a stud link chain?Checks right before flooding the dry dock and how to check pintle clearance.....

repeat all functions.

1.how refractory is connected,how many layer,material for refractory.2what is TLV-TWA,TLV-STEL,TLV-C

Ryan Monteiro TLV TWA- Time weighted average.-Conc of vapour in air which may be experienced for an 8 hr a day or 40 hrs a week throughout a person’s working life. Most commonly quoted TLV. TLV-STEL: Short term exposure limit-Max conc of vapour in air allowable for a period of upto 15 mins with not more than 4 exposures a day & at least 1 hr between each. Always greater than 1, not given for all vapours.. TLV-C: ceiling conc of vapour in air which should never be exceeded. Only substances which are fast acting are given this. Ammonia n chlorine are among liquefied gases assigned this....

Praveen Rawat Types of refactory material- acid, neutral and alkaline....material of each type..acidic-clay/silica, neutral-granite/alumina, alkaline-magnesiahow is it fitted to refactory-by hooks of U shape welded to the furnace and the last layer held by wire mesh.

2nd attempt, Prakarsi alone, Fx 3, 6

Page 9: Fn 3,4b & 6 Updated April,2012 (MEO Class II)

Fn 4 & 6 Pakrashi

Cleared Fx 6

Fx 31. ISM all 16 elements in detail..lot of cross questioning...ammendments2. ISPS & certificates.3. Anchor Chain, stud link chain diagram, how it is fitted material and checks to be carried out.4. Stern tube construction, method of fitting, material, dimension.

Fx 61. take over as 2nd Engineer what all statutory certificates to check.2. Sheer strake to be welded to deck plate how to surface prepare and welding method.3. Paint Scheme on ships...he wants to hear silicon based self polishing paints.how is thickness decided...by the ships speed and the period for drydock.Thickness...said 100microns of 3 coats.Structure...honeycombHow to measure...by ultrasonic gauge4. Types of refactory material- acid, neutral and alkaline....material of each type..acidic-clay/silica, neutral-granite/alumina, alkaline-magnesiahow is it fitted to refactory-by hooks of U shape welded to the furnace and the last layer held by wire mesh.

02/4/12pakrasi onlyfun4,6 att:4.askd abt wrtns, clear all..fun 41. wht is latest dev in t/c.vta...how it works? said it varies the turbine angle acc to load... didnt know in detail... how? said by using a pneumatic actuator... frm where it gets signal?? said not sure but i think it sud get frm gov or speed setting... why vary angle? said to get better efficieny at low load? why only low load? said its a const press turbine, it has good efff at high load, but to improve eff at low load, vane angle is varied and it behaves as pulse type tc, which has better eff at low load... but what type of turbine is pulse type? said impulse, what abt const p? reaction... whats reaction t? it uses the enthalpy diff of exh gases instead of press energy to run the turbine.. what abt impulse?? said it convertss the press energhy to velocity to run turbine....ok.. then how can u run an reaction t as an impulse t just by changing angle??said we dont convert it, but it improves the low load eff.. what was ther on ur rta engine? const press only.. why not pulse?? why companies r going for const press nowadays?? said since ship is mostly running at full speed, ccompanis r bothered more abt full load eff... started laughing..2. what types of engine dne till now.. 8rta84 ...ok tell me tell me cronological development in sulzer starting from RD engine... said didnt do rd or rnd engine.. ask u know abt rtflex? isaid yes.. how do u know abt it withut sailing?? tell how rotory ex v/v worked??improved efficeincy? why it was introduced? why removed??didnt know whats rotoy ex..told him abt uniflow and loop scav.. told some diff betn rnd and rta like exh valve, bore cooled liner etc.. askd to draw bores in liner..what type of compression do we have in cylinder? told abt adiabetic, isothermal etc.. went in toomuch details..definitions etc

3. solas reg abt blr gauge glasss.said 2 means of level indication...not exactly... he said he want as per solas... i sai i dont remember exactly,, he said no need to mug up solas, but u need to understand the underlyng principle or motto abt solas.. then i said one local and one remote indication shud be there... wrong.. he gave me 1 min to find the exact word.... i thought for 1 min and told him what he wanted... two "independent" means....... he was happy.. and me too.4.thrust brg inspection.. started directly with procedure... who will do RA?? went deep in RA... explained procedure.while taking measurements after removing pads, if shaft shifts axially what will u do? said jacking. askd to show location of jack..went too much deep.. didnt know correct position. kept guessing with reasoning. he said its not so easy.5. csm survey period.. after long debate abt internal survey, pms ect, and after 2 guesses found its 5 years..

Function 6.1. paint scheme. started with told from wrtns notes . not happy atall.. wanted composition of Si based foul release paint, how it releases (in layers) why in layers? what type of press pump used for painting?how the layers are determined? how u come to know if layer is released or not? how many layers? said depending on layer of painting.. 5,30,25 micro. said dont bullshit. how is it possible n all... total 60micron for 36 monts of ssailing betwn dry docs?? wear only 2microns/month?? shuld think b4 ans...2. preparations for 20m thick plate welding.. t joint weld, electrode etc.. didnt know much.sheer strake materia, welding of HTS and MS plates etc.got screwed here..3.a/c comfort zone. 21-26deg 40-70% rel humid. ok what is the insulation material ussed for accomodation for cold weather? how its fixed, what r the layers? culd name only glass wool as asbestos is banned.4. draw and explain qcv. drawing was not good enuf but was able to explain everything..

at time of result askd abt my performance, said i tried my best n all .. fun 4 i answered well, and 6 satisfactory! he said u tried well, but i can give only fun 4B. said culd have given fun 6 also if internal was there and if he was happy!. i told him to ask more qs in fun 6. he said he wd have asked if i was falling on boundry.

Page 10: Fn 3,4b & 6 Updated April,2012 (MEO Class II)

Fn 3 ,4 & 6 Dattar & Gadkar

lucky to get atleast fun4 from pakrashi but missed out chance to clear class2.

02-04-12 internal gadkar ext dattar...same patent question...(2nd attempt)

fun3;types of ship yu sailed on..-what is ism , ism amendments, ism chapters-how will yu deal with cargo tank hole in oil tanker-psc checks-damage stability criteria for oil tanker-safties in pumproom and the name of seal in between e/r and pump room bulkhead-cross section of double skin bulk carrier-solas chapter12-deck foam fire fighting system told as per fss code capter14-annex6 ammenments and where we are in nox and methods for controlling the nox-slective catalytic reactor working

fun4b and 6liner glazing and where it will be more either in 2s or 4s-differnce between rta and rta-u-sulzer tribopack-what is pulse jet lurication system-omd alram came and yur course of action and drawing of omdxhead bearing clearance increae will yu run engine-cranshaft deflection and significance of graph-difference between thin and thick shell bearing ,material of thin shell-con rod bolt drawing and speciality-running in prcedure for 2s and 4s engine-what is fatigue stress and what is residual stress is it good or bad for the component-2s crank case oil tbn increasing , viscosity increases reason , what will happen to viscosity of oil if it is emulsified by water-valve timing diagram for naturally aspirated and turbocharged engine-rta main bearing removal procedure and what should be the lift- what is micro seizure and reason for micro seizure-differnce betwwen x-head bearing in rta and b and w-what is load dependent lubricatin system in rta

Cleared all.

Subodh Singh for cargo tank hole i told we will follow sms checklist contact to company , inform nearby port state and more imporantly he want to hear that in return the company will give full support TO shipboard personnel as per ism chapter 8 emergency prepardness here he stopped me and proceed to next question..

Subodh Singh for seal between e/r and pump room i just told him it should be gas tight he accepted

Nikhilesh Nithin calaytic reactor working?

Subodh Singh for scr unit i just draw a rough diagram having hydrated urea tank having 60 percent urea and 40 percent water will be going to exhaust trunk by a pump and there in exhaust trunking hydrated urea will be supplied through nozzle and that will be going to scr having prefabricated steel structure having honeycomb shaped layers of titanium di oxide having vanadium pentaoxide as active substance which augment the process ... and for cleaning of nozzles a compressd air line is provided( REFER PONDER)

Subodh Pillai hey congrats....buddy can you pls post the ans for fun 4, 6.....all the imp pts he is looking for....pls bro ..it will be of great help...thanx in advance.....

Subodh Singh for liner glazing i told material for 2-s material of liner surface is softer than 4s engine so over period of time every time fresh surface layer of liner will come out which help to retain the cyl. oil which is not the case with 4-s engine thats why 4s engine require honning more frequently than 2s engine secondly in 4s engine compressed scavange air comes in from top so difficult to form oil film in 4s so glazing is more in 4s

Subodh Singh in rta for main brg oil comes from top as it is in smc engine while in rta-u oil comes from the passage provided in transverse girder secondly in rta-u they have increase the efficiency of stuffing box by increasing the no. of scrapper ring and increase the size of drain hole in the stuffing box itself which avoids the crank case to get pressurised...

Subodh Singh guys in tribo pack do not tell him load dependent lubrication as given in arahana except rest of the things i told as per arahana...

Subodh Singh in pulse type lubrication system all quills will be injecting at the same time in tangential direction

Page 11: Fn 3,4b & 6 Updated April,2012 (MEO Class II)

Fn 4 & 6 Pakrashi

Peter Juud Dcosta yaar subod running in for 4s only for running in gear rit

Subodh Singh runnuing -in for 2s and 4s told him as per manual and want to hear before taking generator on full load all trips need to be tried out and as given in manual of b&wSubodh Singh for residual stress i told they are locked-up stress which may generate during uncontrolled hot working or cold working process so they are tensile in nature so these locked residual stresses try to releive when comes under force so these tesile residual stresses are not good for engine componenets while residual compressive stresses are good as it is with case of semi built crank shaft and turbine blades(IN turbines by the process of shot pinning small steel balls will be directing on blades of turbines at control speed which induces the residual compresive stress which increases the strenght of material against fatigue)

Subodh Singh there was one more question related to lub oil analysis report what is the significance of insolubles in lub oil...

Subodh Singh so i told percentage of oil insoluble represents the rate of oxidation of lub oil they(insolubles) are solubles in benzene while they are not not solubles in heptane or pentane...

Mayuresh Upadhye

02/4/12pakrasi onlyfun4,6 att:4.askd abt wrtns, clear all..fun 41. wht is latest dev in t/c.vta...how it works? said it varies the turbine angle acc to load... didnt know in detail... how? said by using a pneumatic actuator... frm where it gets signal?? said not sure but i think it sud get frm gov or speed setting... why vary angle? said to get better efficieny at low load? why only low load? said its a const press turbine, it has good efff at high load, but to improve eff at low load, vane angle is varied and it behaves as pulse type tc, which has better eff at low load... but what type of turbine is pulse type? said impulse, what abt const p? reaction... whats reaction t? it uses the enthalpy diff of exh gases instead of press energy to run the turbine.. what abt impulse?? said it convertss the press energhy to velocity to run turbine....ok.. then how can u run an reaction t as an impulse t just by changing angle??said we dont convert it, but it improves the low load eff.. what was ther on ur rta engine? const press only.. why not pulse?? why companies r going for const press nowadays?? said since ship is mostly running at full speed, ccompanis r bothered more abt full load eff... started laughing..2. what types of engine dne till now.. 8rta84 ...ok tell me tell me cronological development in sulzer starting from RD engine... said didnt do rd or rnd engine.. ask u know abt rtflex? isaid yes.. how do u know abt it withut sailing?? tell how rotory ex v/v worked??improved efficeincy? why it was introduced? why removed??didnt know whats rotoy ex..told him abt uniflow and loop scav.. told some diff betn rnd and rta like exh valve, bore cooled liner etc.. askd to draw bores in liner..what type of compression do we have in cylinder? told abt adiabetic, isothermal etc.. went in toomuch details..definitions etc

3. solas reg abt blr gauge glasss.said 2 means of level indication...not exactly... he said he want as per solas... i sai i dont remember exactly,, he said no need to mug up solas, but u need to understand the underlyng principle or motto abt solas.. then i said one local and one remote indication shud be there... wrong.. he gave me 1 min to find the exact word.... i thought for 1 min and told him what he wanted... two "independent" means....... he was happy.. and me too.4.thrust brg inspection.. started directly with procedure... who will do RA?? went deep in RA... explained procedure.while taking measurements after removing pads, if shaft shifts axially what will u do? said jacking. askd to show location of jack..went too much deep.. didnt know correct position. kept guessing with reasoning. he said its not so easy.5. csm survey period.. after long debate abt internal survey, pms ect, and after 2 guesses found its 5 years..

fun6.1. paint scheme. started with told from wrtns notes . not happy atall.. wanted composition of Si based foul release paint, how it releases (in layers) why in layers? what type of press pump used for painting?how the layers are determined? how u come to know if layer is released or not? how many layers? said depending on layer of painting.. 5,30,25 micro. said dont bullshit. how is it possible n all... total 60micron for 36 monts of ssailing betwn dry docs?? wear only 2microns/month?? shuld think b4 ans...2. preparations for 20m thick plate welding.. t joint weld, electrode etc.. didnt know much.sheer strake materia, welding of HTS and MS plates etc.got screwed here..3.a/c comfort zone. 21-26deg 40-70% rel humid. ok what is the insulation material ussed for accomodation for cold weather? how its fixed, what r the layers? culd name only glass wool as asbestos is banned.4. draw and explain qcv. drawing was not good enuf but was able to explain everything..

at time of result askd abt my performance, said i tried my best n all .. fun 4 i answered well, and 6 satisfactory! he said u tried well, but i can give only fun 4B. said culd have given fun 6 also if internal was there and if he was happy!. i told him to ask more qs in fun 6. he said he wd have asked if i was falling on boundry.

Page 12: Fn 3,4b & 6 Updated April,2012 (MEO Class II)

Fn 4 & 6 Dutta

Fn 3 , 4 & 6 Ghosh & Dutta compiled by Arpit

Goyal

Abhinav Rajvanshi

orals 10-04-20122nd Attempt,Dgshipping Only Dutta Sirmy orals got postponed from 30th to 9th n then to 10th....n 2day i ws told to come at 0930hrs.....i thut orals wont start at that time n went late....I was thr in his cabin at 1000hrs but he asked me why was i late....so 1st impression was bad....why did u only cleared safety in 1st attempt and why not others....i said,i could not answer a few questions,ok.Function 4b1.Which type of engines have u sailed on.Hyundai Man B&W 6S50 MC-C Mk VIIMitsui Man B&W 6S50 MC Mk VI2.MC-C....Complete Lube oil system.i started from the ME lube oil sump tank-P/P-Auto Backwash Filter-Cooler(via 3 way thermostatic control valve)-Main bearing(explained complete lubrication,how it is achieved) and Telescopic pipe,from where it goes to X-hd n how lubrication is done of X-hd brng,Slippers,guide shoes,piston cooling oil,big end bearing.3.Slide Type Fuel Valve.I started with initially we had sac volume F/V....den Mini sac volume Fuel Valve now we have Zero Sac volume fuel valves.i told him by doing this we have reduced SOx,NOx and reduced to amount of unburnt carbon deposits.It ceases entry of fuel into the combustion chamber after injection,which reduces HC and CO emission and overall it has lead to reduction of NOx by 25% but increases fuel consumption by 1%.Also told it is a Patented design of MAN B&W.4.What is Slow Steaming?Running of M/E at Low Loads,from 10% MCR to 40% MCR continuously to reduce the Co2 emissions to fulfill the Requirements of Annex VI chapter 4....which talks abt SEEMP and EEDI.....and by this the present ship can fulfill SEEMP requirement,which talks abt the operational measures of reducing Co2 emissions....also told all the problems associated with running engines at low loads and for remedies told him abt Variable Exhaust Closing,Precise Fuel Injection(only in ME engines),Using fuel valves in rotation and VTA T/C by which degree of supercharging is increased and matchingof T/C at Low Loads also...and its working.

3.(My failing Question) What all checks do you do in DD on main BB....talked abt insulation checking,ckt breakers,and tie brkrs.....wents on wid wateva was cuming in my mind......what i 4got and he wanted to hear was CHECKING ACB TRIP BY CURRENT INJECTION......OVER CURRENT TRIP TESTING IS DONE ONLY IN DD.he asked me have u done DD,i said NO.

Fucntion 6:1.What all chechs do u do on Propeller in a DD.Crack repairing(if any),as per Saif Tole notes,Propeller Polishing,tlkd abt withdrawal of Tailshaft withdrawal.....and checks......this gave him the next question.2.How do u take propeller drop(this was my failing question last time).Told him using Poker gauge,and whr and why.3.A major Breakdown that you have seen.Told him a prob that i had seen,when i was a trainee....Exhaust V/V not opening fully due to teflon ring arnd the air piston leaking....oil escaping into air cylinder and it being incompressible caused this,then how we came to know,high exhaust gas temp for that unit,told increased cylinder lubrication in conventional Man B&W lubricator by increasing the stroke of steel ball.....and reducing the fuel rack by the help of the nuts on the fuel rack.....asked more the values....told normal rack 58...reduced one 44....talked abt imbalance and commercial pressure due to which we were not allowed to stop but were running at reduced loads,How much....arnd 60% MCR....what happened due to this....all 4 piston rings broken,asked why....told since the pressure was not getting relieved,generated due to combustion that caused mechanical overloading of piston rings(exceeding the design pressure that too for prolong period of time).....what did you do finally....Decarb,okay.

Said You will have to Repeat Function 5.....you are passed in 4b and 6.

Lube oil sampling/analysis,why done,what are the sampling points for ME....Inlet to ME,B4 & Aftr Pfr,B4 & Aftr Auto back wash filter(this is for the ship i had sailed on,i said)....What All Samples,name the Machineries.ME,AE,Stern Tube,SG,VRCS,Emgncy Gen,COP,Winches(last 2 i 4got to say) n Dont say FRAMO....According to him it Deck system and we have nthng to do.

oral 1st attempt 9 april 12ext ghosh.. dutta saab internal..fun 3

Page 13: Fn 3,4b & 6 Updated April,2012 (MEO Class II)

Fn. 3 ,4 & 6 Ghosh

1. rudder drwng.. was not able to satisfy his demands, He desires a very functional diag.2. co2 isotope testing. had not much clue abt his ques. he asked at wht press my reading wil not b correct.. what wil b the press at which liquid wil show false rdng3. what r the provision for the tranverse bulk head in tnkrs to relieve stresses in case of rolling.. he meant that in the ullage space, what arrangement.I drew him a corrugated bulk head, with stool.. all that. he was lik???how stresses r relieved.. again/ SORRY SIR4. squatting effect.. in detail.. main toh ittna he batta paya k jhaaj ki bottom lag jaegi..he is more interested in HOW??5. If C/O loads cargo in tnkr.. what is limit?? assuring it.. I said 90% or its as per ship condn..thats it.. no more ques in this secn.

Fun 4B1. underslung crankshaft. What it is. how is crankshaft located/ how is the load taken up. why is it provided in design..2. bearing.. what arrangement in 4 stroke for not havin relative motion.I told him abt the tapered protrusion. Actually,by now, I was really confused in the way that I was unable to draw ne diag for this. though I explained him the arrangement with hands.. but.. to no use..3. fuel timing numerical.. It goes like.. In an engine, the speed is 1400 rev/min. Fuel injected is 15.5 deg btdc and terminates 5.5deg ATDC. Calculate how many times pump delivers in a sec.. I made lengthy calculations as by the mean time he was having his lunch. My one eye went on wat he was havin as I was hungry by now.newayz,my calc came out to be a wierd figure of .000036 sec.. damn do I realized wat that figure is.. some how, he revealed n said. how hav u calc this.. Looked at him with a smile..4. by now my future was written.. still he asked me ..Wat r the limitations for sulfur.. in a fuel.. he was not asking me the figures in marpol annex6.. he was asking me wht limits the lower end of the sulfur content in a fuel. I cud not take his ques well and started in wrong direcn as sulfuric acid.. cold corrosion.. but he insisted.. Mr Singh, U r on the wrong track.. I said I hav not understood the ques.. Meanwhile ,Mr Durgesh Jha ,Internal Surveyor sittin beside came to my rescue.. he explained the ques to me in hindi.. Hehehehe.. he mus have thot that my Englis is weak hain. But sai mein frnz ,I cud not get the ques to the right direcn.. his meaning was k agar main kam sulfur fuel use kar rahan hoon ton kya hoga, aur kitne kam value tak use kar sakta hoon.. Then again main apni bewakufi se sir lo pooch raha hoonm.. Is it sumthing related to running in.. he said leave it..5. draw automatic starting air valve.. Main fir confuse aur pata nahi kya banane lag gea. mujhe bhi nahi samajh aa rai thi k watz this.. chalo..

6. waht is overlap in start air valve.I explained.. then he asked.. how provision for this is maid..I showd him the cam profile.. he was ok//

fn61 What is SCH40 andSCH80? wat is common in the both.2. flash back arrestor. whr,diag. explain. Sorry SIR.. drwng mat pucho..3. Interference fit. here he said tell me. Iwant to giv u atleast this funcn.I told him that when shaft dia is bigger than the hole in which it is goin.. then he said giv egs/. I told propellar shaft and propellar,camshaft coupling bolts.. he asked more. I said Morgrip bolts.. flywheel and intermediate shaft.. he said no.. dont tell ne1 else that they re interference fit .. they re bedded bolts.. with blablabla..4. Then last ques, Metal Locking. Thanks to my discussion group fellows. they explained me very nicely so,I was able to explain him and he was happy with it, .finally.. RESULT IS clrd fn 6..Thankx fellows. Deshmukh,Samson , Vanshi n Ravi bhai n all MEO group .Plz do post regularly. atleast ques if not the cross quess yaar..gud luk to all.

First attempt oral....ghosh

1)cargo tank of an oil tanker chief officer has loaded 85%...now ship is pitching, rolling...oil is splashing churning etc.....wat r all arrangement in tank to reduce it.....draw the diagram2)rudder diagram3)o2 is high before scrubber unit or after scrubber unit....if so why

4)draw sulzer fuel pump5)draw auto air start valve6)case study:im not concerned about marpol annexe six regarding sulphur emission....i dont care about sulphur regulation,i want to use high sulphur fuel oil....why....wat r advantages7)scaba air bottle pressure,speciality of scaba air compressor...why we dont use main air compressor for charging scaba bottles8)chain block lifting and lowering mechanism explain in detail....9)wat is overlap....explain...what is function of negative cam..10)when using hydraulic jacks why the cylinder head nuts are fully tightened and loosened back half round before applying hydraulic pressure11)draw indicator diagram explain it?12)maintenance of switch?

Page 14: Fn 3,4b & 6 Updated April,2012 (MEO Class II)

Fn 3, 4 & 6 Ghosh & Mishra

13)bottom end bearing bolt is not going inside....wat will u do put lube oil and try or will u try without lube oil? Reasons? Wat will u do if chief engineer ask u to put lube oil and fit it?(i really got raped here)....search for answer in internet thats wat he said?

.result wash out.....may like this situation do not occur again for you guyz....my best wishes to you all......

oral 1st attempt .ext- ghosh , int-mishra

fun31.draw rudder and stern arrangements ( DRAWN SEMI BALANCE RUDDER REEDS SHIP CO. PG. NO. 90) + how to connect nut in locking pintel ( TOLD FROM BOTTOM SIDE) + how to construct rudder (TOLD SAME AS IN SAIF TOLE) + hydraulic testing of rudder ( FILL HYDRAULIC FLUID AND APPLY PR. HEAD UPTO MAX. DESIGN DRAFT OF SHIP)2.tank sounding method? ( RUDDER GAUGE ) + how will you take sounding if rudder gauge fails ? (USING UTI GAUGE [ ULLAGE TEMP INTERFACE] ) + procedure of using it? (FIX THE UTI GAUGE ON SOUNDING PIPE THEN OPEN THE V/V)

3.what is d difference betn tank scope and hydro-carbon gas detector ?

4.how will you measure different gasses without using multi gass detector ? ( DREGER TUBE) what is d procedure of using it ? ( TOLD SPECIFIC DREGET TUBE IS PROVIDED FOR DIFFERENT DIFFERENT GASSES, KEEP ONE IN GREGER INSTRUMENT AND BREAK IT, USE ASPIRATOR FOR DRAWING OUT SAMPLE.)

5.what is the difference betn product tanker and chemical tanker deck foam fire extinguishing system? ( I HURD IT FIRST TIME SO WAS NOT PREPAIRED FOR IT ,, TOLD HIM WHATEVER I KNOW ABOUT LOW EXPANSION FOAM AND HIGH EXPANSION FOAM ,,, FRNDZ PLZ CHECK ITZ EXACT ANS. )

fn 41. CASE STUDY : in 2 stroke 1400 RPM engine, fuel injection timing from 15.5 degree BTDC to 5.5 dregree ATDC, calculate fuel injection per second? (CALCULATED BY ( 15.5+5.5)/360 ,... FUEL INJECTED PER CYCLE ... DAT FIG * 1400/60 ... TOTAL FUEL INJECTION PER SEC .... HE WAZ EXPECTING SOMETHING ELSE ... )

2.dram indicator diagrams.and explain ? fow to calculate mean effective pr.?( DAT WZ MY FAILING QUESTION )

3.what is hardness and how to find it ? ( TOLD ITS RESISTANCE TO WEAR AND EROSION... AND BRINILS HARDNESS TEST ..)if one element value is 200 and other one is 400 then which one is better ? ( I SAID 200 ONE ...) why ? (DONT KNOW)

4. what is catfins and what is d max value in fuel ? + who decides the value ?( TOLD ISO 8217:2010) + what is the first component of engine get effected ? (TOLD FUEL P/P PLUNGER BARREL , FUEL V/V NIDDLE GUID , LINER)

5. angle difference bet exhaust v/v and seat ? ( SEAT= 29.9 TO 30 DEGREE,,, V/V= 30.3 TO 30.4 DEGREE) + why this difference ( TOLD AS DURING RUNNING VALVE GET EXPANDED AND FORM PROPER SEALING)

fun 6.1.centrifugal p/p wear ring clearence where take, draw diagram ?? how wear rings are attach in verticle split type casing p/p ?? (COULD NOT ANS LATER PART )2.if pv valve gets stuck during loading .how will u continue?( HE WANTS TO LISTEN D OPEN CLOSE INDICATION TO CHECK FIRST AND THEN OPEN D CLOSE V/V MANUALLY)3.flaring tool draw ?4.stud extractor tool draw?

result - CLEAR IN 3, 5 AND 6 .....UNEXPECTED FOR ME .... BUT REALLY VERY HAPPY FOR DAT .... THIS HAPPENS JUST BECAUSE OF THIS SITE ... AND WITH THE HELP OF ABHINAV RAJVANSHI, SAMSUNG ROY, SARFARAZ CHOUDHARY, RAHUL, LOKESH ,,, AND FOR NOTES BALAJI, SAIF TOLE .. WITHOUT UR SUPPORT I CANT IMAGINE MYSELF IN CLASS 2 BATTLE ... THANKS A LOT GUIES .... THANKS GOD

FRIENDS PLZ WE CAN EASILY CRACK CLASS 2 ORALS WITH THE HELP OF THIS SITE ... SO PLZ KEEP POSTING GUIES AND HELP OUR OTHER FRIENDS TO CROSS THIS HURDLE.

Balaji Ganesh Shrikant Deshmukh fn.3 qn.5 the foam used in chemical tnkrs are Alcohol resistant foam dats the only diff..

Rohit Ghadgefoam diff crude oil,chemical n product tanker : 1. Protein foam concentrate. It is diluted with water to form 3% to 6% solutions depending on the type and, ingeneral, it is only used for crude oil fires.2. Fluoroprotein foam concentrate is very similar to protein foam concentrates. It may also deposit a vaporisationpreventing film on the surface of a liquid fuel. It is diluted with water to form 3% to 6% solutions dependingon the type, and is used for crude oil or refined oil products where a higher degree of protection is preferred.3. Special ‘alcohol type’ foam concentrate forms a foam that has an insoluble barrier in the bubble structurewhich resists breakdown at the interface of the fuel and foam blanket. It is used for fighting fires in water solution and

Page 15: Fn 3,4b & 6 Updated April,2012 (MEO Class II)

Ques. Fn 4 & 6

Fn 3 , 4 & 6 Ghosh & Mishra.

certain flammable or combustible liquids and solvents that are destructive to regular foam. Mainlyused for protection onboard chemical tankers.

Draeger-Tubes® are glass vials filled with a chemical reagent that reacts to a specific chemical or family of chemicals. A calibrated 100 ml sample of air is drawn through the tube with the Draeger accuro bellows pump. If the targeted chemical(s) is present the reagent in the tube changes color and the length of the color change typically indicates the measured concentration. The Draeger-Tube System is the world's most popular form of gas detection.

Rohit Ghadge Select the appropriate Draeger-Tube® according to the chemical hazard to be tested and the required measuring range.

guys plz help...1. how can cold corrosion or hot corrosion in liner or exhaust v/v be identifiable by just seeing it??2. how watertightness is achieve in holding down bolts of m.e.?3 what precaution should be taken while taking thrust block clearance??

Ashish Tripathi cold corossionis when temp. come below dew temp. then it form...hot corrosion form when sodium and vanedium is in 3:1..it form v2o5..which lead to hot corrossion..

Aditya Vardhan Gupta due to hot corrosion u will observe a 'cobble stone' effect.. where as due to cold corroson it will be more like pitting on a much larger surface area

Tushar Bakshi what is cobble stone effect

Aditya Vardhan Gupta when, due to hot corrosion repeatedly small small parts of the liner wall are removed then the entire liner surface gives the appearance of a cobblestone road.. jaise ki gaon ki desi bricks walli road.. this uneven surface of the liner is known as the 'cobble stone' effect

oral 1st attempt .ext- ghosh , int-mishra

fun31.longitudnal section of bulkcarrier cargo hold.2.draw rudder and stern arrangements3.rough weather cargo ballast .4.radio active isotopes principle for measuring co2.

fn 41.dram indicator diagrams.2. 4stroke engine stress on con rod bolt wid diagram of all strokes.3.wat are catalytic fins.what all parts of engine do they effect.4.draw auto start valve.5. centrifugal pump cross section .where to take clearances.

fun 6.1.engine room crane testing. where is strong point.?2.draw VJ coupling.3.exhaust valve angles4.if pv valve gets stuck during loading .how will u continue?

result - washout.

Nikhilesh Nithin its a hold which is used carry ballast in heavy weather..but he wants details like extra stiffening , corrosion resistant paint etc...i dint answe it properly

Samar Rustagi is this rough weather ballast tank only available in bulk carriers and not on other ships ? .

Nikhilesh Nithin as i had done bulkcarriers , so he asked me this question , i think its only for bulk carriers

Ashish Tripathi where to find V J COUPLING

Page 16: Fn 3,4b & 6 Updated April,2012 (MEO Class II)

Fn. 3 & 6 Pakrashi

Pakrashi Ques. compiled by Arpit

Goyal.

Rohit Ghadge guyz. .radio active isotope principle?

Varun Kodnani ashish its the same as ermato coupling. we used to use them for patchwork in broken pipes.

Mahesh Vvsn Tadi one cargo hold mostly at the centre is designated as rough weather cargo hold with extra plate thickness for blkhd's all around. frame thickness is increased & deballasting arranegement is provided.

2nd attempt, Prakarsi alone, Fx 3, 6Cleared Fx 6

Fx 31. ISM all 16 elements in detail..lot of cross questioning...ammendments2. ISPS & certificates.3. Anchor Chain, stud link chain diagram, how it is fitted material and checks to be carried out.4. Stern tube construction, method of fitting, material, dimension.

Fx 61. take over as 2nd Engineer what all statutory certificates to check.2. Sheer strake to be welded to deck plate how to surface prepare and welding method.3. Paint Scheme on ships...he wants to hear silicon based self polishing paints.how is thickness decided...by the ships speed and the period for drydock.Thickness...said 100microns of 3 coats.Structure...honeycombHow to measure...by ultrasonic gauge4. Types of refactory material- acid, neutral and alkaline....material of each type..acidic-clay/silica, neutral-granite/alumina, alkaline-magnesiahow is it fitted to refactory-by hooks of U shape welded to the furnace and the last layer held by wire mesh.

Guys any answers of these favourite questions of pakrasi:

1.)Sheer strake to be welded to deck plate how to surface prepare and welding method.2.) Sulzer engine main bearing..thick or thin shell and sulzer liner got stuck during removal...thn wat to do????

Ashish Tripathi in RTA THERE R THIN SHELL BRG...IN RND HAVE THICK SHELL BRG...IF SULZZER LINER GOT STRUCK U HAVE TO INCREASE HYDAULIC PRESSURE WHICH R USING TO LIFT LINER AT BOTTOMAshish Tripathi TO WELD SHEER STRAKE PLATE TO DECK PLATE..AS BOTH R SAME MATERIAL..SO MAKE V GROOVE AND USE FULL PENETRATION CONTINIOUS WELDING

Himanshu Bhambhani thanks ashish.....can u plz tel me where is the jack placed...n even aftr inc. hyd. press...n pulling by crane it doesnt come out....thn wat....????

Ranvir Raj how much is the limit for rising hydraulic pressure before giving up and start looking for other options, in case of liner stuck, and what are possible alternatives?

Mohit Khanna Some one told circulating coke through that particular unit jacket And even descaling liquid would help.

Aayushman Singh Chauhan P=F/A (pressure = Force per unit Area) depends on liner weight ... For trassi I guess its 60 Bar. Calculate with Approx area of the jack's (some sulzer manual say use two jacks (on the Diapdram where stuffing box is put and some engines one jack on the x-head to jack up the liner !

Ashish Tripathi JACK PLACE ON CROSS HEAD....REST SAME WAT U SAID

Ashish Tripathi I THINK PRESSURE IS NOT FIX ...U HAV TO RAISE TILL IT GET FREE

Ravindrakumar Mehta it should not be increased more than 10 percent of opening presure

Mayuresh Upadhye whats the material for sher strake and deck plate? both MS or HTS?since its a T-joint, how exctly will b the v groove?

Ashish Tripathi its HTS

Page 17: Fn 3,4b & 6 Updated April,2012 (MEO Class II)

Metal Locking

Kinghorn Valve

Boiler Bulging

Ashish Tripathi SHEER STRAKE IS 10...20%IS THICKKER

Himanshu Bhambhani ravindrakumar : u r right, not to b increased more than 10 % of opening pressure

Varun Kodnani cut the liner using arc cutters along the height on the port and STBD sides... the gap is made. hammer it inwards while keeping it suspended. long process but gets results.

Himanshu Bhambhani ashish do we use any particular type of welding.....i mean TIG,MIG or sumthing else..

Aditya Vardhan Gupta whatever the pressure, its reverse load on the cross head sud not increase more than the downwards acting pmax in the engine..it is around 70-100 bar.. the calculation has to be done similar to the what Mr Chauhan has said.. and remember that trassi accepts that there is no fixed pressure mentioned in the manual anywhere

Devinder Sharma in qus 21 locking material shld be such that can wthstnd high load high tensile strength ductile fatigue strength and same strength as parent material or more strength than parent mat. nickle fullfill this condition .......metal locking shld be in y axis(across the crack) and stud after drilling in x-axis (along the crack)

Devinder Sharma for drilling a pattern came in which drill bit pass .....kept that pattern on crack and drill it

Devinder Sharma first drill across the crack and put studs which come in continious shape so that crack will be in compression and than drill along the crack and put studs along the crack studs should be arrange in such a manner so that each stud overlap with another stud...it ll make gas tght seal geneally used in liner and cyl head t/c csng and sw p/p csng its life same till parent metal life

Praveen Rawat metalocking used for cast iron ,al n steel..first apertures r drilled ..dumbbell shaped keys r fitted

Praveen Rawat then studs r fitted in drilled holes around d crack so dat dey overlap to give a tightness almost equal to dat to parent material.

Kinghorn v/v

Aayushman Singh Chauhan Ya this is correct. King Horn is an old name. They are plate type valves. Mostly used in Bucket piston Arrangements ( Air Pumps ) ... They are unidirectional valves ! Just like the Air Compressor valve shown Above (TANABE 246H )Aayushman Singh Chauhan The ones Used previously like on Steam ships on Air pumps ; where the Air had to be extracted(Like what we use Air Ejectors these days, STEAM DRIVEN) from the Condensor (Vacuum Condensor)... These King Horn Valves used to be quite Big ... Guessing about 150 mm Dia just A guess but

i also dont know the exact answer for bulging but yes i heard few points from some guys outside ...... if bulging is small...then we

Page 18: Fn 3,4b & 6 Updated April,2012 (MEO Class II)

Compressor Overhaul Procedure

Cl. II All Functions Pass Karthik Reddiar by Trassi

have to put some jack system .. and then a wooden piece on the other side of jack which is resting on the other side of the ...boiler furnace ... then heat the bulging to the temperature not below than the critical temperature of the furnace material... that is it should be around 950 -1050 but not less than 850 . and then start jakcing it .... make the furnace normal... straight with the help of jack.. now remove the jack then again heat it to remove stresess.... BUT if the bulging is more -------- then remove the bulged part and take the same dimension , material and all other same properties... vala plate...make V groove in the plate as well as in the furnace also . and heat the plate first 4 stress removal and then weld (low hydrogen electrode) it from boiler inside and outside and again heat it for stress removal..then grind it to make it smooth ... also from both side... bus yaar agar mere se poonchta to main yahi bolta... but as soon as i started to speak his answer..he stopped me and directly asked about the temperatures and tick the questions.. by god grace ... so i dont know this procedure is correct or not... but yes atleast kuch to matter hai hi on bulging repair...

Comressor overhaul procedure, how vill u chk bumping clearance

Karthik Reddiar The convenient method is to take lead wire from the engine store and make a small ball based on the expected clearance and put it between the piston and the head from the valve opening. Then the piston is slowly turned to the top dead centre with the help of a Tommy bar. After that the piston is again turned down and the lead wire ball is extracted and the thickness measured with the help of a micrometer. This measurement would give the bumping clearance.

The caution which must be observed in these methods is that the clearances of the main and the crank pin bearing have not been taken into account. The correct method is thus that after turning the piston to top dead centre the piston connecting rod must be jacked up with the help of a crow bar. It is only after this hidden clearance has been accounted for, will the correct bumping clearance be found.How to Adjust the Bumping ClearanceThe bumping clearance once found to be incorrect would have to be adjusted. The methods of adjusting the bumping clearances are as follows:1. The cylinder head gaskets can be changed to a different thickness thus altering the bumping clearance.2. The shims between the foot of the connecting rod and the bottom end bearing can be changed thus changing the bumping clearance.However after adjusting the bumping clearance the clearance should be checked once again to make sure that there is no error and the clearance is within the range as specified by the manufacturers.

10/01/2012, Trassi and Datta...

fun 3

1)IBC AND BCH difference..ans: the dates as 1st july 1986 thing. and IBC mandatory under solas chapter seven whereas BCH only voluntary.also post 1993 edition of BCH are shortened as it asks the user to refer chapter 17 and 18 of IBC...he asked the difference in coloumns in new IBC and old one in chapter 17...i dont know..

2)air lock in lpg carrier..ans: only motor room presurized NOT the air lock space..compressor room under negative pressureand regulations as per IGC code.

3)vegetable oil -pollution categoryans: Y category and type 2 chemical tanker.

fun 4

1)SMC and RTA main brg detailans: i answerd as per RTA 58T-B..lub oil supply from side.i.e vertical bore in bedplate transverse girderclose to waisted studs...tightening procedure and angle to check ..also number of keeps as all know.bearing material RTA whitemetal,whereas SMC small bore 46-50 and all have thin shelled alsn40..not for large bore...only compact all bores thin shelled due to the twin stay bolt ..small bore i said coz mark 5 and 6 have this thin shell inspite of long stay bolts...SMC two brng keeps on top...oil supply from top shell...also add composition of brng material.

2)RTA fuel pump timingans:though never did RTA..detailed exlanation as per manual...cross question on pressure bush..answer he gave me that the valve seat is loose fit and not interferencefit..to prevent it from blowing out during delivery stroke,the bush holds the seat in place...Please read well from manual...his question was that two days later u got anchorage,wat u ll do for pump timing check?...i said

Page 19: Fn 3,4b & 6 Updated April,2012 (MEO Class II)

Understanding Capacity Control in Ship’s Air Conditioning and Refrigeration System

previous records,any abnormality,spares used etc.....said i ll check the tools,manual,data for adjustment..then briefing crew..risk assessment ..gave an example .

3)fuel oil bunker specs...ans:ISO 8217:2010....he wants this year 2010......

fun 5

1)alternator-MSB cable insulation.ans: what he wants: disconnect from stator..and then short all three from der.from MSB side ,clamp eath terminal of meggerto cable insulation and measure between each conductors...THIS IS WHAT HE AGREED..but the cable-cable insultionis still there,but he s not intersested in that...i asked him,and he gave some funda...let it be.pls answer as above only.

2)static electricity.ans: start with electric double pole layer...pls google for this..this is important for two materials at interface.he gave me this answer of what happens before charge separation..dont want muchh of Isgott..

3)motor in workshop for two mnths idle...what to check to put back in service..ans: said about OC and SC ,,then came thing about values...i argued stating that depending on point of failurebetween phases i.e the total length of coil as resistance proportional to length...he agreed but wanted some value.i said for 4kw motor,healthy resistance was 25ohms.(luckily there s a quetion in our eletrical which i said).he said for 50HP motor?...gave a shit as 1-1.2 ohm...but i assumed a case as failure very close at terminals,so hardly any lengthso value on meter 0 to 0.2 etc etc....don knw why he insited on value muchhh...so better took advantage of assumptions..

4) emcy swbd regulationsans: solas chapter 2-1 part d,reg no 45....all same stuff...0.6 mtr,insuation mats,deadfront,ebonite handles,no pipelinesco2 extinguisher....cross question type of battery for emcy gen start....nickel cadmium..startting regulations...said as perregulations i.e, hydraulic one, pneumatic one which should be dedicated to that only etc...all as per solas..pls read solas..

5)HRC fuse on busbar how to remove?ans: special tool is there to remove ..no need to have dead busbars...this answer given by him..i said its bolted arrngmt..he said no..ask batti saab...actually i answered this coz hve seen this roadside domestic supply red box...the big HRC fusesare fastened ...anyways anyone try to get this special tool detail......

fun 6

1) why drydock with trim?ans: started that trim can be ahead or astern..calculation remain same for 'P 'force...only thing stern stronger than bowalso easy to align when trim stern...said only slight trim or else virtual loss increases wid higher trim higher..any all theory...cross question -when stern on block,started pumping ,wat u do to avoid any capsize if any neg GM and heel due to external force also...cudnt answer this but said abt timber shores..i m not sure of this ...he dint said any..

2)stern seal-explain.ans:drawn the drawing..not much of cross question..only he askd wat if it leaks and wat r ur options,..again i took assumption as calm sea ,so not much change in draft...make arrngmt for equalising pressures at sealby calculation i.e height and density ....also i said go for cylinder oil...or that environmental friendly oil,some gard.dont remember name..said thts biological,,,no harm to sea if it leaks...

3)anchor not heaving up...wat u ll check..ans: check the performance of motor and pump...how?engage winch and chain drum..load the motor...check the pressure gauge on pump...if its increasing and relief valve lifts,no problem wid machinery ...if pressure is stutttering,hyd motor piston rings may be broken as i said Radial piston type hyd motor...or else working clearances for pump increased so unable to build pressure...or oil temperatures high...finally possible anchor blocked due to some foreign object,,,he gave an assumption that coupling between winch and chain drumis good ..no mucch of mechanical wear or friction......thats it..no questions further..

datta came ..asked me to stay outside...they spoke sumthing...trassi pointed my form and exn and telling sumthing..i was cald in...dutta askd my background...classs 4 wen and how many attempts...who gave u?..fortunately it was himselfwho gave me fun 4 and cleared class 4..then he started wid wat is SEEMP,solas amendments,why separate battery roomwhy not to have it in engine room,liner coatings for which i said only for rings-said liner dont know only honing is there-drew thathoning of semi wave pattern on MAN engines....exhaust valve overhaul..battery maintenance...thats it..

Page 20: Fn 3,4b & 6 Updated April,2012 (MEO Class II)

What is Capacity Control?

Capacity control of a refrigeration plant can be defined as a system which controls the output of the plant as per the load in demand. As the load (temperature) of one room is achieved, there will be no more need of the refrigerant for cooling. Hence, the solenoid valve supplying refrigerant to that room will shut. This functionality is called capacity control.

The refrigeration compressor consists of different units working in parallel to cope up with the load. As the load decreases, the capacity control system cut off one or more units (depending upon the load) and maintains the efficiency of the plant by reducing stresses on different parts.

Components and Working of Capacity control system

1. Compressor lube oil pump supply

2. Capacity control valve

3. Capacity control regulating valve

4. Un-loader assembly

The compressor lube oil pump supplies oil to all the bearings and one connection is provided to the capacity control valve.

The capacity control valve is provided with high pressure oil from the compressor lube oil supply pump. This valve has several grooves bored in to its periphery and connected to the un-loader mechanism of different units.

A spring piston is provided which controls the spreading of high pressure oil supply in to the bore chamber. The spring piston is pressed by the oil supplied through an orifice which pushes the piston and aligns the un-loader holes, supplying high pressure oil to the un-loader unit.

The un-loader assembly comprises of a un-loader piston held by a spring. The un-loader piston is connected to a rotating cam ring having lifting pins attached to th suction valve. The lifting pins always act on the suction valve i.e. un-loading the unit at stop condition.

Page 21: Fn 3,4b & 6 Updated April,2012 (MEO Class II)

Thermostatic Exp. Valve With Equalizers

External equalisers are used in installations where the evaporatorcoils are long, and hence there can be a large pressure drop.These eq.lines assist to provide the actual saturation pressure of the refrigerant, so the it can maintain the degree of super heat.

When the bores on control valve aligns with the un loader bores, oil will pass and press the un-loader piston rotating the cam and releasing the un loader pins from the suction valve.

The capacity control regulating valve is responsible to control the pressure (opening and closing of capacity control valve ports with un-loader ports). Its one end is connected to the crankcase and other end to capacity control valve.

As the pressure in the crankcase drops due to reduction in load, oil in capacity control valve is drained into the crank case leading to closing of un-loader ports, lifting of the suction valve, and cutting of the cylinder unit.

Page 22: Fn 3,4b & 6 Updated April,2012 (MEO Class II)
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