Sheet1Sr. No.Questions AnswersSurveyorFunction1Stroke / Bore
RatioEngine power developed =(P*L*A*n*k) of one cy) X no of
cylinders. multiply and divide by (2R) where R is the radius of
piston = P*(L/2R)*A*n*k*2R = P*(Stroke/Bore)*A*n*2R Hence total
power increases as stroke/bore ratio increases. And obviously power
reduces when no of cylinders reduces. Also, bearing friction
reduces as stroke/bore ratio increases.Trassi4b2Difference bw MECC
& AECCTBNTrassi4b3Boiler Cold StartingTrassi4b4Reasons for FWG
Vaccum Not coming upTrassi4b5Why air compressor cooler drain open
when we stop the compressorIt basically serves the purpose of An
Unloader while stopping the compressor to drain any trapped air
between the cylinders.It is done so that the trapped compressed air
above the piston does not add up to the starting load; the next
time the compressor cuts in.6Dischage method of EGE cleaning
water?Mixture is collected in soot collecting tank. D tank has
heating coils(steam). Once tank full put alkanity control chemical
n open steam. Once water evaporates collect d soot. Apart from dat
during washing a jute bag is attached to the pipe opening ofsoot
through which some amount of soot separation takes place. Apart
from all dis v have a connection to bilge tank. But we seldom use
it as it creates trouble for ows. Also in case of tank rupturing d
content of tank could be transferred to bilge tank.7Why air
compressor crank case breath pipe provided and why with flap?if ur
piston ring worn out or butt clearance is incresed so at tht time
our crankcase is pressurised so we want to avoid tht pressure with
the help of breather pipe.. flap is open only when crancase
pressure is more thn atmospheric pressure8How to know cyl oil feed
is correct?by calculating scoc and comparing it with shop trial
reports9VIT & supet VIT difference and how it worksBefore the
Super VIT was introduced variable injection timing was obtained by
means of a special profile on the fuel pump plunger. Hence there
was a fixed relationship between the injection timing and the fuel
index. Thus it was not possible to adjustthe fuel index of the
individual pumps without also altering the injection timing. For
this reason the Super VIT was introduced, where it is possible to
adjust the fuel index and the injection timing independently. Both
do the same function of maintaining pmax after the break point.
Only difference between the two is that VIT has a fixed break point
which is usually 85% load and super-VIT had variable break point...
Means break point can be changed from
85%...............................................................
but why the break point is to be adjusted? Well before that let me
explain break point, it is the reduction of vit index at a
specified load lets say at 85%mcr after that vit index reduces. As
is in fuel rack there is an index on how much fuel is being pumped
(you can see that in fuel rack) , just like that; vit index is the
adjustment in fuel timing (advancing or retarding). So in VIT this
break point is fixed may be at 85%; but in SVIT it can be adjusted
these are adjusted electronically; the adjustment of break point
depends on scavenge air pressure.Nowadays all man b&w have svit
i guess10Dead Man's Alarm11how to remove and check condition of
buttom end bearing of A/E without removing cylinder headRemove fuel
injecter 1st . . And frm that hold put eye bolt on piston top and
connect chain block . . . And nw open crankase door . . Turn the
engine to suitable position so that u wil open connecting rod bolt
and lower buttom half . . Nw all wt .on chain block . . Guide
piston rod and piston and crancase while turning engine so that its
top part doesnt damage . . And with flash lgt u can inspect top
part . . .612Andvantages of semi balanced rudder ??turning torque
is less bcz the force acting on aft part of rudder is counteract by
forward part of rudder 2) steering gear can be lighter and
smaller13Why flywheel provided in air compressorA flywheel is
provided to store rotational inertia and provide mechanical
advantage for manual rotation of the assembly. -Providing
continuous energy when the energy source is discontinuous.
flywheels are used in reciprocating engines and compressors because
the energy source, torque from the engine, is intermittent. The
amount of energy stored in a flywheel is proportional to the square
of its rotational speed14o.w.s probe working?It works on principle
of capacitance.... probe interface is filled with dielectric.
Dielectric constant of oil and water are different15Diff btw
unloader of mac and reefer(draw reefers dia)in case of air
compressor Der is a solenoid operatd drain vlv wich vl open d drain
durng startng for 2-3 Min der wud b no compression in dat case n al
d accumulated water + moisture wud b draind der by preventng d
compressor frm heavystartng torque.. In case of refer compressors d
purpose of unloader is to unload a particular unit wen d load
demand in evaporator room is less..it works on d principle wen say
if load demand is less in d refer room der is a pressure sensor
wich vl sense d pressure of d room n if pressure is less d pressure
sensor vl signal pressure switch to release d oil wich is actn on
each individual unit of refer compressor to d crankcase der by
unloadn any unit wen d load demand is less in evaporator
room.Despande16define scv efficiency. If L is de stroke wat s de
formula foer scv efficiency17if V is de total volume L is de stroke
give eqn for volumeteic eff of air comp18Why m alkalinity is double
dat of p alkalinity.. why it shud nt exceed19why do u need a
deaerator.. i said to avoid air lock.. dont u think expn tank can
do it.. den wat s de significnce20rudder pressure test21Define
critical rpm. Which all machines have dat...does a centri pump
posses criti rpm22trammel gauge how is it used..Whr ll u find dat
punch mark.. exact location23One gauge glass showing low level and
in the other the level is fluctuating.Action to be taken?u have to
consider the reading which is lowest and stop the boiler if no
corrective action take then lead to rupture of boiler tube24what is
differential pressure in ac comp? Why no diff pres in mac ?In mac
air is sucked frm outside nd in case of air refrigeration
refrigerant is sucked frm closed line itself n refrigerant acts on
d lubricant.....so to get d exact lube oil pressure diffrential
gauge is usedDespande25why injection pressure high in diesel
engines whereas boiler using same fuel but less injection pressure
?diesel engines are CI engines high pressure n temmperature are
required for selg ignition and fuel valves have to overcome this
pressure wheras no such pressure in boiler .Despande26reefer
compressor suction pressure is constant and rooms maintained at
different temperature how ??Despande27Why refergeration compressors
are single stage compressors?Becz critical pressure is low fr
refrigerant28fuel valve leaking , pax will increase or decrease ?FO
v/v leaking leads to after burning resulting in reduction of Pmax n
increase in high temperature.... Also black smoke from
funnel29Significance of having thrust block inside the engine &
as well as remaining outside?30How to adjust tappet clearance if no
marks on flywheel or camshaft and push rods are tightOpen the
crankcase door and check for the fuel cam to be on rise and the
remaining two cams of push rods on base circleTrassi31Why ph of
feed water in hot well less than in boilerBoiler water is more
alkaline than feed water because chemical added is carried back by
steam in reduced concentration.32What type of motor is there in
windlass or winchesIn electro hydraulic system winch/windlass motor
is hydraulic and pressure generation pump has induction
motor.Variable delivery pump .......Also external gear ;vane; axial
piston motor is also used..Trassi33how wil u know micrometer is
giving exact readings?micrometer is provided with a reference piece
that is of standard dimension..50mm i guess..calibrate the
micrometer accordingly.Sharma34Crankcase relief door
setting.Crankcase Relief Door Setting : Generally done by shore
party with Spring Balance Method. P = F/A. Force is found out by a
sensitive spring balance and area of the relief door is given in
the manual. Hence, pressure can be set.Trassi35Bumping clearance,
how it inc or dec, how to check.Air Compressor Bumping Clearance :
Increases if the crankpin bearings are worn out and decreases if
cylinder head is over tightened over the gasket. Clearance can be
measured with the help of a lead wire ball.Trassi36AUTOMATIC
COMBUSTION SYSTEM IN BOILER DIAG AND WORKING37Can Governor be
manually disengaged38why slipping clutch is provided in
windlass..?Windlass is supposed to slip incase of excessive force.
Otherwise rope will break and can cause accidents39How do you start
a compressor manually?40What is priming in fuel pumps?Removal of
air after replacing a fuel pump on the engine. We use the same line
that circulates low pressure fuel thru the injector when engine is
not running.41Your sea water line flange leking ur hief engineer
tols u to cut gasket for that how u will cut.U have to measure
outer dia of flange pcd n bolt dia n outer dia of
pipe.Shirish42Your hydrophouk pump was licking because there was no
gland on pump how will you select gland for punp.U have to measure
shaft dia, see the size of gland casing, while assembling gland
should put one by one n shouldn't have any twist, cut of glands
shouldn't in same line.Shirish43Ur aft bilge well not taking
suction possible reasonsFilter may be chocked,gasket licking,other
two valve no holding, level of bilge is low, hole in bilge
line,suction mouth chovked by clothes.Mishra44How will u rectify
that crank shaft deflectionIf deflections are out of range..take
main bearing clearance of all units...if mb clearances are not as
required..then need to change bearing..if mb clearances are all ok
and deflection is out of range...that's a clear indication of
distorted bedplate..then.u can check for loose tie rod and
foundation bolt..if that is ok..u cannot do anything..take shore
help.45Why diffuser if volute casing is there ??Diffuser is more
effective than volute casing ..it is used where high pressure is
required Its nulify radial thrust too46Why does the hydraulically
operated exhaust valve of the main engine not fall in the cylinder
if air spring pressure is removed ?Valve will not fall into the
combustion space as the spindle is located onto the air piston with
the aid of a split cotter which prevents the spindle from falling
down even if the spring air is vented completely47Why v r not
blowing down boiler to bilgewater flashes off to steam excess
possibility of burns damage to equipment... 2. boiler water has
chemical which will later effect OWS operations... 3. May result in
local heating and thermal stresses and later cracks in the tank
top..48Why distribution hole is not provided in clarifier plates?U
don't require interface to occur within the disc stack diameter,
clarifier is separating out solid within liquid phase. Not
required. Hence plugged49Bnkr line pr testing?Procedure...choose
any one same bk tk for suction and filling..keeping the valve open
which isolates all the bunker tanks from the bunker manifold..make
sure bunker manifold valve is also closed.. start fuel oil transfer
pump...now slowly slowly start closing the bunker tk filling
valve..this will increase the pressure in the bk line Bcz as u have
closed the valves for filling bk tk... one has to stay near the p/p
breaker with a radio set..the pressure is raised till about 4 bar.
..n remaining 0.7 bar (4.7 bar) with a hydraulic hand pump..time
limit I don't remember...I think it was 1 min50how to cut off fuel
from sprcific unit ? in manuevring if needed how to do it ?in Man
B& W: lift the roller up using chain; in Sulzer RTA: Turn the
knob below fuel pump. it can be done while engine is running Fuel
cut off lever...turned to 180 degree by hand..so roller lift up frm
the fuel cam.. .take air hose..and connect it to puncture valve..u
can cutoff when running also..51relief valve n Safety valve
differences atleast 51.SV: Fully opern at set pr. RV:Start open at
set pressure.Fully open at15-20%above the set pressure 2.SV: Close
at set pressure. RV: Set at pr. Lower than the set pr. 3:SV:
Relieve excess mass RV: REleive excess pr. 4:SV: Can open manually
RV: Can't open manually 5:Set to open 3% above the working pr RV:
Set to open at 10% above the working pr52how we can order a
pipePrepare the data for what u have to order. Like for pipe - its
nominal dia, shedule, material, legnth, pressure, etc. whatever is
known. Send these data to company through the software service
provided onboard for ordering, with CEO and captain approval. Other
method is to find respective code for what u have to indent in IMPA
or ISSA manual, and forward a spare request to captain through
ceo.53Exhaust gas boiler n Eg economiser ....Differencesexhaust gas
boiler is an integrated system having its own water and steam drum.
Economiser is a separate heat exchanging system getting water from
and putting steam into aux boiler water and steam drum54Wt is the
function of mixing collum in f.o system...??Mainly :1) Gradual
change over of fuel from Heavy oil to diesel oil and vice versa, As
name said it allows mixing of two grades of fuels 2) Any vapour or
air lock in sys is vented through top of column chamber 3) It
prevents return of fuel oil which isalready at injection temp to
again mix with comp low temp fuel in sevice tk...thereby saving
thermal efficiency of fuel ciculating sys. 4) An already counted
fuel through flowmeter is required to preserved from return line by
bringing to mixing column back rather than serive tk. 5) Maintains
postive press at fuel circulating sys55in cascade tank oil is found
and was is ur immediate action ???(boiler is firing now)..If u see
oil in cascade tank...stop main engine, change generator to diesel
oil, then stop boiler, change over all d heaters to stby heater. N
then check one by one which heater is leaking n
rectify.Shirish56wat r the safeties in steering gear and its
location..???3 level switches are present in system, relief valve,
manual bypass valve, low pressure valve, electrcial stopper, manual
stopper, motor overload alarm. level switch 1 will give an alarm in
case of loss of oil due to bursting of pipe, level switch 2 will
activate in further loss and resulting in activation of solenoid
valves which will operate both bypass valve and isolating valve
simultaneously as a result splitting of system such dat each power
system will operate 2 rams only, further loss of oil will results
in activation of 3rd level switch in such situation faulty system
willb isolated and one system will operate 2 rams as emergency
steering gear...RELIEF VALve IS PRESENT in system to release over
pressure in case of rudder shocks during rough weather location
unknown. MANUAL bypass valve is provided incase of isolating one
sysetem and rudder to turn mechanically. low pressure valve is NRV
which opens for oil filling from header tank57why the high pressure
line(eg.steering gear system) has square type flanges and not round
type?becz in high pressure lines v cANT put gaskets so proper
sealings and o rings v use sqaure flanges58from telescopic pipe ,
how does lo goes to xhead bearing , any othr conection is thr after
telescopic pipe??telescopic pipe is arrangement has one inner pipe
one outer & stuffing box at d lower end of fixed outer pipe
having floating bush. outer pipe is joined to the main oil supply
& inner one to the guide shoe for Mc c. floating bush is not
packed at bothsurfaces. man b&w crosshead journal has a central
axial bore which has connecting bores to upper shell. lower bore
has a transeverse slit at d surface which is aligned with the large
bore of the shell. large bore is longitudinally connected with
other grooves. design has certain features such that bigger journal
dia ,minimum play bw d surfaces, channeling through grooves. so
very largeload bearing area and better distribution of oil
therefore pressure required at the bearing surface during load also
does not exceed 3 bar59during manuevring, how to know if starting
air valve is leaking ?Thermal Patch, Relief v/v lifting, Paints
peeling off, Smoke from starting air manifold drain60fitted bolts??
can anybody explain??They have interference fit... U hav to tap
litl while fitting.... Used to join two stuffing box half...61what
u have done onbrd to control nox??how u know that nox are in
limit??Maintained the nox technical file.. The spares used were
according to it..62How to order nut n bolt?63Why settling tank temp
is not maintain above 60 degree celcius.convectional currents sets
in due to which its not settling anymore64Why we blow through
engine in ahead direction normaly?Generally cams at the time of
testing after the previous finsih with engine are in forward
direction , so first its forward is tested to avoid excess air use
and then , astern aftr abt 15 mins once air resv tanks are back 2
capacity .. If distributor cams are ahead after FWE than blow
through will be ahead and vice versa65How to check the trueness of
omd alarm??Check O setting= flushing omd with O2 frm O2 cylinder in
omd itself......check for Span setting which sends gas....don't
rembr name....havng highest LEL.....if alarm comes omd is properly
working.....corrections r welcum66How ll u remove broken tie
rod?1.pass a braided wire down the bottom half and pull it out 2.
if the break s midway then go for this method... pull the top part
out using chain block... for the remaining piece.... clamp it at
the bottom exposed side... use pull blocks and hold thetie rod pice
with clamp... now remove the bottom nut....and use a hyd jack below
the tie rod piece.. now use a spacer to push the piece up... repeat
procedure and use more spacers till broken piece emerges out from
top.. use e/r crane to lift it up by clamping top portion and using
a welded bead to prevent slippage67One generatar not taking more
than 50kw, why? any onespeed droop settings need to be altered. as
the load increases, the rpm tends to decrease before stabilizing
itself again. that means your generator speed is falling below a
certain rpm when load is increased more than 50kW. So what should
be done is, run the generator at no load and check its RPM. make
sure that it is within the limits prescribed in the manual. If not,
adjust it accordingly. Problem should be solved. Agar gen is not
taking load, check the governor setting, possible it's load setting
has been set at a lower level, then check droop, if these are
correct, check power management system.... Bcoz if problem is with
t/c dat can be seen by many other ways, t/c will start making
abnormal noice , also if aur faulty gen will not come on load....
Paralleling wud fail.68STP blower fails? What will do?service air
connection provided with pressure reducing valve...69one of the
plate heat exchanger is ruptured what will u do? nyone pleaseRemove
2 consecutive plates if new plate are nt available. and tighten wth
the same amount corrsponding to the thickness of the 2 plates
removed.70I.g oxygen high level..ReasonsCooling air given to uptake
valve leaking , blower seal leaking , air damper opened more71How
to test the relief valve of air compressor????????Remove relief
valve from compressor n fix it to hydraulic pump with a flange
..use water for testing ..now raise pressure ..n keep checking
pressure at which it lifts72In fuel oil service system for main
engine. ..why the heater is placed after the circulating pump why
not before the pump?fuel is a mixture of lot of products with
different boiling point hence if heater is placed before
circulating pump then it can lead to gasification ...so if it is
after circulating pump then due to increase in pressure boiling
point of products of fuel also changes hence prevents
gasification73why cant we turn generator in reverse directionthe
lube oil pump won't run in the other direction hence the engine
will seize74surveyor on board show him HP relief valve is working
.Close the discharge... Run the compressor in manual... If it lifts
at correct pressure it's working fine if doesn't lift stop the
compressor immediatelyTrassi75Scavenge space inspectionwhat you
will check before cleaning and after cleaning and before entery
what precaution you will take..Shirish76How u will calculate
compression ratio..Shirish77You have to make a pipe..how you will
make..78Gear pump, how does it generate pressure, cross
questioning; How is the discharge pressure of the gear pump
regulated?79On the fuel pump side, a pipe coming out of the fuel
pump with spring, I said SHOCK ABSORBER; Which is the point at
which shock absorption is needed?80Function and need of lamellas?
(cross questions)81Fuel pump overhaul of A/E? what is the most
important aspect while boxing back the fuel pump which can go
wrongshims and marking on the fuel rack and plunger to be
matched82Diff. B/w ref. Comp. Mech seal and pump mechanical
seal?83if water is mixed with lb oil viscosity will incr or
decr.??Decrease84what action after an a/e is tripped on low lub oil
pr?Keep the pre-lub pump running; Keep turning the engine using
turning bar...followed by Crankcase inspection after 45 minutes;
Simultaneously try to find the reason for trip.; But practically we
check the LO filter first85Omd alarm sounds Ur actionrun from
engine room as per man b&wTrassi86Why pressure test is carried
by water not by air/gas?If the system bursts under the pressure
Test the air or gas will expand, accelerating the broken pieces of
metal outwards.So, Pressure tests are always carried out
Hydraulically, this usually means water, because that is cheap,
safe and readily available87what is the cause of ext gases is
coming out from all cylinder head of aux engine?nozzle ring of
turbochargerTrassi88what will happen to the main bearing of aux
engine if lub oil pr is just near to the lub oil trip
pr?Exactly....there will not be a major problem as long as the
engine is operating at low loads....at high loads, the load on the
bearings will be higher which will require a higher lub oil
pressure at the bearings for the hydrodynamic lubrication to take
place.Trassi89Crankcase relief v/v lifting presure1.05
absolute90what r the advantaged of long stroke engine?1. Slow speed
2. Low grade fuel can burn completely 3. Moment of inertia is less
and hence flywheel of less weight can be used91during lub oil water
testing if i add reagent quantity half or 50%, what reading will
show by gauge??Trassi92What are diferrent euipment use in vapour
compression and vapour absorption cyclekamath93Measurement of
impeller of centrifugal pump94Where mouth seal is fixed95if
distance (clearance) between wear ring and casing ring is
increased, motor ampere increased or decreased.96Boiler water test,
full?97Difference betn boiler water and jacket water?For jcw i said
we usually dose Nitrate to stop corrsion, n in boiler water we do
phosphate test , pH for protecting the boiler tube for scale
formation.98What is diff betn cetan and octane
number?99T-Alkalinity test?Take sample from P-alkalinity test,
titrate it with N/50 sulphuric acid n add methayle orange( M-
alkalinity), the colour of solution should become colourless from
pink. It measures the whole carbonate concentration and hydroxile
ion...100What is performance curve?Orion101How will U calculate
power of main engine except power card method?for calculation of
power other than PLAN formula is, calculate the torque from torsion
metre and multiplied it by 2pieN/60. ie. P=2pieNT/60.Orion102hw
fuel pump is connected with governerOrion103air compressor valves
and how u will find out which side will be facing the piston ? draw
the diagram104why there is negative cam for air distributor &
positive cam for fuel cam?Negative cam ensures positive closing of
starting air vlv through air distributor...in negative cam the cam
remains mostly on base circle and only portion of cam at rise which
prevents cam from wear down...fuel cam is always in operation when
engine is running.105wat is meant by Boiler safety valve
floating?Floating of a safety valve means setting the safety valve
pressure.106Fuel pump and exhaust valve actuating sys in camless
engine107Was ur boiler medium or low press boiler108Capacity
control in ac.Diagram of unloader in capacity control109Air comp
not starting on Auto & ManualLO Pressure trip; overload relay
active110Purpose of turning gear1. Turning gear is a starting
interlock in an engine. Connecting the turning gear to the
flywheel, operates a switch, thereby starting becomes impossible.
2. To check the free rotation of the engine's parts, running gear,
chain drives, shaft, propeller.111Method of cutting fuel pp of a
unit in main engine112How you will keep crosshead bearing ready for
survey including method of bearing removal?113Method of removing
main bearing of main engine.114Wht all checks you will do in
gearcase of fuel oil separator?115How you will come to knw purifier
bowl has attained required speed?116If a stud is broken evenly with
head surface..how you will you remove it ?117Draw scrubber tower
and explain till IG reaches cargo tanks118What all possible reasons
4 incresed lub oil consumption after 1000 hrs of decarb of
generatorIf your piston ring damaged then they can cause large
consumption of oil. If o ring in your lo pipe line of turbochager
then oil will escape through that but no ex high temp will be
noted119hot & cold corrosion120draw stuffing box and
xplain121Air compress H.P side ka pressure 25bar hai to suction
side pressure kitna ho ga exactly?5 barTrassi122what is the purpose
of Mast riser, PV breaker and individual PV valves which are
located on each cargo tank???pv breaker is located in the line and
pv v/v is on the tank ... purpose is to prevent from overpressure
or vaccum Pv breaker is located in a line its work for a line
safety at a time of putting of ig for tank collapsing its 200 mm of
wter gauge and for vaccum its -700 mm ag of vaccumand pv valve its
indivisual tank safety .. Pv vv setting is 1400 & -350 mmwg for
individual tk, to compensate expn n contraction of cargo during
sailing.Pv breaker 1800 & -700 mmwg is a common sec safety fr
full ig line/ cargo tanks in case any pvv doesn't operate Mast
riser (manual operation) to allow gases to escape n thus prevent
overpressurisation of tanks while loading...when pvv cant cope
up123how to know injetion point of fuel pump124How to take butt
clearance of piston ring?? ...procedure and instrument used??For
new ring it is taken by placing it on the least weared area of
liner and for old ring it is taken on the most weared area of the
liner.. At that area for used rings there is more chance of
blowpast because of lack of sealing125why pulse type turbo charging
system is used in aux engineBecause of load variation126why
centrifugal pump not used for hfo ...while it is used for loThe pr
reqd is imp..For hfo we need pr. .For l o the quantity of l o is
imp127all things do you check during axhaust valve overhaul
??128what all checks you do just before mounting exhaust valve back
???checks v r doing after overhauling are leak test for air and
drop down test of the spindle.. in drop down test test v ll supply
air to the non return valve in exhaust valve assembly then v ll
remove the air connectn.. if valve fall down with in 1 hr then it
indicate leakages with in the sytem.....for leakge test v ll supply
air to the non return valve.. if air comes through a bore below the
oil drain pipe then it means ur stem seal is leaking..then remove
the oil drain pipe and check.. if air comes through oil drain hole
then it means either ur air piston is leaking or ur relief valve is
leaking..129which 1 is better mechanical seal or gland packing ?? y
??130how can v control cavitation ??v can control cavitation by
controling the temp of the fluid and also controling the suctn
pressure.. suctn pressure should not reach high vacuum.. this can b
controled by proper maintenance of sutn filter131why 4s stroke
governor faster than 2sAs d speed of governor increases its
sensitivity increase...it can detect small speed variations due to
change in load.As we know dat 4_t auxiliary engines r used as prime
mover for driving alternators...& load changes r frequent due
to starting & stopping of electrical equipments132Jacket water
line of genTrassi133How to show surveyor testing of bilge injection
valve?take a gunny bag...Fill with water...And put it near d
suction valave of the pump...And start the pumpTrassi134Fwg if 100%
vaccum?If vacuum is 100% boiling rate of water vl increase n
salinity increases..+ scalling in evaporater increases...Rapid
boiling,carryover of salt,adjust vacuume adjusting valve.. Shell
temp lowTrassi135aft bilge well not taking sucnleak in the
lineTrassi136you are about to do decab of one unit in main engine
,, so what parameters you gonna record before doing that ??? and
the precautions??check peak and compression pressure, exhaust temp,
jcw in and out temp, l.o pressure main engine, piston cooling oil
pressure and temp, scavenge air pressure and temperature, check the
stuffing box l.o tank level, make sure u have a safety meeting,
immobilization certificate, propeller clearance and work permit
before hand137m/e , a/e eng lubricationOrion138how you know AE
piston is in tdc ?flywheel marking,fuel pump marking...... by
checking the freeness of push rod and rocker arm.... by checking
the position of cam shaft... extreme case by putting head inside
crankcase and looking inside liner ....remove fuel injecrtor and
fix a gaugethere ...when piston is coming to tdc it will rotate in
one direction at one point it will stop and rotating in opposite
coz it started moving to bdc..by this way also u can
find139Decompression lever of a diesel generator operates(opens)
which valve. exhaust or suction??exhaust140Why do we use storm
valve in sewage system instead of non return valve?what is the
advantage of using storm valve?If we use non return valve what will
happen?And also for the fact that normally these valves remain in
close condition only open due to the weight of discharge so unlike
a regular say globe NRV need not be always kept in an open
position141if u see the sewage system there is on u bend in the
discharge line...can u tel me why it's is there? Wat is the
reasonSiphoning effect by bend.Ya if der s no height of liquid
coloumn on discharge side there s a chance of air lock or vaccum
lock in d inpeller of the centrifugal discharge pp ...due to which
pp ll loose suction142compressor liner lubricationCompressor liner
lubrication is done by injecting drops of oil through the inlet
valve along with the air143stuffing box n clearances144why we
caliberate cyl liner he wanted to listen very specific
answer145lantern ring position and function in cen p/p,146reversing
of staring air cam147swelling , panting in boilerSwelling : sudden
load increase steam pressure goes down ,,water level shows than
normal148boliers-mountings, working of dp transmitter, how feed
water is controlled to boiler, working of diaphragm control valve,
draw the control diagram of boiler feed water
controller149generator- now u r gng to lay up generator for 2
months, what all precautions you will do before lay up?, what all
checks you will do after 2 months for restartig the generatorlay up
means we have to keep generator for 1 or 2 months in idle,,,, first
and important thing is condition of space heater,,, it will take
care of the insulation of windings,,, he is happy with this
answer,,, then we have to tell abt the prime mover side like
condition of lube oil, preheater, fuel line checks, any rust or
corrosion to the prime mover after lay off etc.150what is the
capacity of ur air bottle? Regulations and he asked safety
too151what is ums checklist, he told me dat, now u r 4th engr
coming to engine room for ums round, tell me procedure one by
one.152what is the purpose of puncture valve, how it will
activates,..Then he asked,, even in running time of main engine at
sea, air is present on top of the puncture valve but why it is not
activating???153what is mean by steam hammer?.....what is mean by
water hammer?in steam hammering..the steam goes to the cold pipe
which is having condensate inside and not been drained..so when it
goes in it cools down and form water rapidly which lowers the
pressure in at that spot and the condensate which was not drained
fullyget sucked on to that place and bang the walls of the
pipe..thats steam hammering but water hammering is when a
valve(other then steam)is opened and pressure is high like water
from a pump and that water hits the bends of the pipe creating
noise and damage to the pipe..154why gudgeon pin floating type in
engine but not in compressor??In air comp the c'shaft is driving
the piston in all strokes,but in case of AE c'shaft is driving the
piston in all strokes except power stroke,where the piston now
drives the crankshaft.So the sudden change in direction of force
can cause an IMPACT LOADING on the pin if it is floating due to
clearance in AE piston155What is NDTWhich all NDT can be done
onboardnon destructive testskamath156What is initial setting of
dial guage what's it's least count what's it's rangekamath157Why
would there be rpm fluctuations in case of scavenge fires?In
scavenge fire, there will b less air available for scavenging, n
thus the Pmax will b less, in short, power will b less so the
firing will affect n the crankshaft movement will Fluctuate.. thus
rpm will fluctuate in accordance.158Maneouvering diagram
bnwOrion159How to select gravity discOrion160U have to weld crack
in a plate..what is the surface preparation u will do..Explain dye
penetrant testOrion161Safety in gas cuttingOrion162Some Bearing no
6366RS what does it all representOrion163What is batch
purification?Normally done if some contamination is found in
oil...mostly water..Take entire oil from sump...transfer it to lube
oil settling tank...let it settle for at least 24 hours...drain
little water from it...start purifier doing suction and filling to
lube oil settling tank..do water test in oil...and keep checking
water content..164A sea water pipeline on your vessel is corroded
and leaking, how will you prepare new pipeline on-boardHe wanted to
know about how jig is prepared and flanges are made...For flange
you measeure the diameter of the flange,bolts,PCD and the inner
diameter of the pipeOrion165Impeller of a centrifugal p/p is stuck
in the pump. How will you remove it without any damage.try to heat
the impeller and then use bearing puller to remove itOrion166can
anyone help me with the back pressure relationship in a
purifier...i mean if i increase the back pressure (by closing the
valve) or reduce the back pressure (by opening the valve) what will
be the effect on the purity of oil?...apart from the E-LINE moving
outward and inward respectively.how will back pressure affect the
opening and closing of bowl?See if no back pressure oil vl come n
go like a pump ..if back pressure is there oil vl stay for a while
to overcome that pressure ..so more tym oil stays in purifier so
more purification167how to select gland packingBased on fluid, temp
mainly, OD,ID168if no viscothrm onboard , how u maintain fo
viscosity?We maintain the temp required of fo...as given in bunker
analysis169boiler not firing what would be our actions?take to
manual operation. Close fuel and atomizing medium (steam). Run
purge cycle (if possible). And then start fault finding. First
check for alarm on the boiler control panel. Then stop the boiler
1.low water level ( check hotwell water level if water level is ok
check running auxilary feed pump nd do purging if neccessary.put
water transfer pump in auto) 2.flame failure (take out pilot burner
nd adjust the electrodes nd clean the filter inside the burner nd
blow with air) 3.flame failure( open main burner door clean the air
nozzle thoroughly nd swirl plate) If have flame failure just reset
the alarm nd check the pressure of the pilot d.o pump. If no
pressure fill up pilot d.o tank nd do pilot d.o pump purging.170Why
back pressure valve in refri veg room even though a thermostat is
there???1.hold back a high evaporator pressure when an evaporator
feeds into a common compressor suction line fed by evaporator
working at lower pressures. 2. controlling evaporating presssure
and hence temperature to avoid low temperature which could cause
problems ( freezing in water cooler )171whn omd will give alarm? at
what percent LEL2.5% for 2 stroke..1.25% for 4 stroke medium speed
engine172Engine room crane maintenance?beam defection when hook is
at minimum distance . Running test for 30 mins to check temperature
Limit switch Break testing and lubrication... Overload
testing...........Wire renewal 5 years173How to tighten boiler
gauge glass??174How to carry out leak test in shell and tube type
H.Efirst open the both end cover of the cooler shell and then fill
the shell with water , and finally pressurise shell using
compressed air through vent connection & check the both end of
shell . if any tube is leaking then water must coming through the
tube which is leak..175How do you weld 2 Al plates??Tig welding is
used ...tungsten inert gas ...argon is provided with torch which
shield the metal from oxidation and arc is struck between tungsten
electrode and parent metal176Centrifugal pump air extraction
method?Air ejector method; liquid ring priming method;vane pump for
priming 3 method is only for priming177Sweating of refer cc ?causes
and action?Means liq ref is returning... Slight sweating is
ok...excess sweating shows faulty txv bhai hm sure nhi hai....agar
wet saturated low temp ref gas c/c me ayega to outside c/c moisture
will condense....i.e sweating.....causes faulty tev setting ,
frosting of evaporator coil & excessive fall in s.w temp where
condensor is s.w cooled that will lead to excess subcooling dan
expected.....actions throttle d cooling water outlet....so dat ref
gas temp increases....defrosting by passing hot ref gas or by
external heaters if present Reasn is liq ref cumin bak to cc..means
al d ref is nt used in d evaporator.dt may be due to evaporatr fan
nt running,incorrect setting of txv,txv malfunction,solenoid vlv
malfunction,evaporatr tubes frosted or fouled,crankcase heater nt
wrking178Bearings used in purifier?in mitsubishi selfjector
purifier....upper bearing is supported by spring.....lower part has
2 bearing....The higher one is roller type....and below that a
thrust bearing.....The lower two are immersed in oil in the gear
case....The direction of the thrust bearing is important. ....If
placed up side down then it will go off in 10 min. thus in the
vertical shaft total 3 bearings. Horizontal shaft is supported by
two ball bearing or roller bearing at the two ends.Vertical shaft
contains three bearings.Two bearings at the extreme ends are roller
or ball bearings.The upper bearing containing the shaft is made
radially stable by the spring loaded assembly,which is responsible
for the vertical inclination of vertical shaft.The next lower
bearing is an angular bearing to support the shaft axially and
counteract the thrust force.179positive cam and negative cam
differences..?when the movement of roller is upwards for actuation,
then its positive cam. and when roller moves downwards then its a
negative cam. for example fuel cam is positive cam and start air
distributor is negative cam.180why a negative cam is used instead
of positive camTo positively shut ofc pilot air to starting
vv...& also a negative cam wont be in contact of rollers the
tym of whole engine operation (when start air is cut off)...thus
reducing its wear In negative cam at the working face of cam the
follower or valve will act in downward direction as in case of
starting air distributer whrere pilot valve actuate in downward
direction and it shuts because of spring pressure in case spring
fails negative cam will positively shut it. snd in normal operation
its no more in contact with valve rod so reduces cam's wear and
tear181In what case Local emergency manoeuvring to be carried
out..? List all the steps involved in emergency
manoeuvring..?Failure of remote ctrl sys, Fail of govr,, Procedure-
take control frm bridge to engine room ...put blowers on auto
..turn governor knob to local manuvering ..go to local platform and
change selector switch to engine side ..check starting air pressure
..contact bridge with walkie talkie ..accept telegram ... Give air
kick after reaching a certain rpm ..increase fuel lever from zero
..n give fuel according to rpm required (Pass d critical rpm or
braided zone quickly) 182Is there any tel tale hole provided in
plate type heat exchangeryes 183And while opening we tighten the
jack fully first and then loosen it a bit ... by how mucch angle do
we loosen itapprox quarter turn so dat jack & nut is not
jammed....bcoz when hyd press is released d bolt will come to its
normal length alongwith d nut....den it wont be possible to open d
nut..Coz when u release the hydr pr, the nut will get jammed
against jack184What happens to efficiency if u go from cold sea
water to hot?185How to detect leaks in plate type heat
exchanger?Tell tale hole is provided in gasket..Individually
inspect plates one by one in a darkened space with a lamp against
the plate and you can spot if any minute holes in the plate. These
holes cause internal leakage between the two mediums. if any plate
perforation found, plates to be discarded in
pairs..............................................................
visual inspection or fluorescent dye penetrate is used to find any
defeats. (Dye penetrate is used on one side, followed by
ultraviolet rays on the other side)186If while opening a nut with
hyd jack it is not opening at specified pressure then wat to doI
don't think this may occur..If so increase little by little more pr
but not more than 50 to 100 bar187What is fuel pump lead in jerk
type fuel pumpThe distance the top of plunger is above the cut off
holes when that unit's piston is at tdc. By checking the fuel pump
lead markings and the plungers position with respect to the
markings, we can determine whether piston is at TDC. This is in
addition to to its major reason, which is to check fuel timings
with respect to plunger wear. .188How many wear ring and casing
ring are present in a centrifugal pump.Till now whichever
centrifugal pump i hv overhauled i hv found one wear ring at
suction throat to prevent short ckt of suction & discharge
side, n two casing rings to prevent erosion of the
casing189expansion tank over flowing and bubbles coming out reasons
and actions ?1..Jackey water suction pump gland leaking so pump
tking suction frm tht place so these air ir coming out frm
expansiin tk in bubbles form 2..Crack in liner change the liner
3.inter cooler in Mac leak if bubbles reason is, liner crack,jcw
heater leaking,air compressor jacket leaking .......if ex tk
overflow,1. jcw heater leaking and steam passing thruoh jacket
water side2.luboil cooler leaking and oil going to ex tk,3. ex.tk
filled when the engine is stopped r cold,when engine started t
water pre heated and will expand ,4.filling valve left open190aft
bilge well not taking suction where as forward bilge well is
alright are the reasons?strainer of aft bilge well choked....or
gasket of strainer broken so sucking air....hole on
pipeline...Trassi191Steps for preparing M/E for departure.192how
ball Bearing is fitted on shaft?trassi193types of filler gauges
There are 6 types of feeler gauge available: 1. Go NoGo feeler
gauge 2. Straight leaf feeler gauge 3. Tapered feeler gauge 4.
Double ended gauge 5. Offset gauge 6. Feeler strip.194what are the
eddy losses in centrifugal pump?pump start with outlet valve
close....nw as we knw power is rate of doin wrk...in pump work is
to transfer the water..as the outlet valve is close n no water
transfer take place, den theoretically no power consume..bt
practically as v start the pump vid outlet valve close there is
still some power consumption take place, which can b seen as
amperage's of motor....dis power consumption is due to circulation
of water within casing...due to centrifugal force generated by
pump....this is called eddy losses in centrifugal pump...195How air
motor lubrication is done?by FRL unit(filter regulator lubricator)
on the air line196What is moment compensator?197what is Mark no. In
6s50ME c8.2198what does C in 6s50ME C8.2 stand forRead difference
b/w MC & MC-C199Hw to check garter spring properly
wrkingDespande200Autoback flush filter workingDespande201Name the
deck crane movements n safety of deck crane1. Hoisting: jib moving
up with cargo load. 2. Slewing: crane rotating. 3. Luffing: grab
moving down to release cargo load.kamath202T/C surging in
A/E....what will be ur action?? 1. Check the load. 2. Check the
condition of turbocharger filter, if dirty then renew. 3. Ensure no
engine room door is left open(to maintain positive pressure.) 4.
Ensure the blower is providing enough air and is directed towards
the turbocharger. On my ship, the air ducting was divided and one
of the branch led to the workshop store, the favourite spot for
Gaala makers. Often the oilers use to shut the ventilation at other
places to get more hawa in the store. lol..203Why do we need to
pump down all the refrigerant before refilling??if we charge the
refrigerant by weighing bottle, we know that certain amount has
left the bottle. But we are not sure wheather the same amount has
reached the system.(maybe leaks in charging connection) Secondly,
if we charge the refrigerant by only seeing level in reciever, then
we know certain amount has entered the reciever, but we dont know
if the same or more amount has left from the bottle(due to leaks in
the ref system). Hence we pump down all the refrigerent and note
down the initial and final bottle weight. Now, by tallying the rise
of level in reciever and ensuring that bottle weight difference is
also the same, we know for sure that the right amount has been
charged204Purpose of damper plates in compressor valvesThe ppurpose
of damper plate is to protect the valve plate from uneven
compressive force and hence to prevent undue weardown against valve
plate and seat when compressor having variable speed drive,,,,,this
plate may not be fitted in case of induction motor drive as a
driver of compressor205How to repair damged thread of stud?with a
needle file or a die nut...Mainly done using the die which matches
the threading already present. Use a metal polish solution along
with lube oil on the area and then use the die slowly making sure u
don't damage the other threads. Ensure not to apply too much
pressure..206Performance of 4s engine and what all parameters
taken.Compression pr taken or not, how taken207What is written on
taps and dyes, which type of thread?Tap and die have written: A.
Thread per inch(pitch) B. Tap material C. Thread form symbols D.
Pitch dia. Limit208Difference in gauges of refer gauge and other
gauges209Is there any bellow before steam stop valve in boiler
,..???No..but ek demister jaisa hota he.. to stop water particles
getting carried out...trassi210pressure relief valve on discharge
side of air compr opens what will be the reason211how to do
interpolation of sounding while taking bunker values given212in bdn
ul get density of oil at 15* but ur taking oil at 40-50* approx so
with which formula will u calculate the density at the given
temp213 how will u check trueness of shaft of centrifugal pphold d
shaft in lathe.. fix a dial gauge(one which has magnetic base), so
that its plunger touches the shaft. set it at zero in this
position. turn the shaft 1 revolution with hand slowly and check
for the deflection. repeat the same procedure at different points
along the length of shaft..214Alarms,trips interlocks in
incineratorflame failure ,sld temp high, sld temp low,combustion
chmbr temp high, flue gas temp high,draught failure, low level sld
tk for incinerator, thermal failure motor overload .. all thses
alarms followed by trip stop incinerator .interlock- door will not
open till the CCT reaches to 170'c & flue gas will will be
running continoulsy till CCT temp drop below 170'c,215Type of
burner in ur IGG? Draw it.pressure jet typemishra216Auto air start
valve? Wht type it was? Difference between same for B&W and
sulzer?http://www.marinediesels.info/2_stroke_engine_parts/Other_info/air_start_valve.htm
http://www.marinediesels.info/Basics/air_start/automatic_valve.htm
mishra217All Alarms in steering Gear?mishra218Steering gear test
before departure, what all test and checks u do?12 hr before
departure from port 1. communication between e/r, s/g room, bridge
2. main steering 3. auxiliary steering 4. emergency steering.
5.emergency power 6. Visual inspection 7. Rudder movement from one
side 35 to other side 35 within 28 sec. 8. position of rudder with
respect to position indicator 9. detail diagram of steering gear to
be pasted in steering gear compartmentmishra219sea water pipe
flanges leaky, how to make gasket and fit gasketTake inner dia,
outer dia,pcd of flange and cut the gasket220what is the difference
between windlass and mooring winchA winch is a machine usually
powered by a hydraulic/electric power unit that is used to handle
mooring ropes which are used too moor a ship while it is in port or
to a buoy as in SBM/SPM operations. A windlass is a machine
hydraulically actuated(steampowered in the olden days) used for
letting go/hauling up of anchor. The power rating of the prime
mover of the windlass is much higher when compared to the prime
mover of the mooring winches. A ship will usually have 2
windlasses(for starboard and port anchor) and 5-7 (depending on the
size of the vessel )mooring winches221from wer to take bottom end
bearing clearance. of. generator..?Bottom shell when piston is at
bdc222purifier fuel oil temp not coming up.reasonMay be 1) Settling
tank temperature too low...2) Transfer of hfo is going on to
settling tank & the respective bunker tank steam is
closed/blank for any purpose...3)Heater is not working properly..4)
Heater steam return line valve is shut. 5:)steam trap s not working
properlyShirish223.what is the Lube oil pressure in refrigeration
system.kamath224whats type of condenser on your ship and how is
cooling water in/out arrangement in condenser ,cooling water enters
from down side or upside.kamath225Suppose we will put evaporator in
room then room will cool down or not.kamath226Why there is lube oil
differential pressure in compressor and which pressure it is
showing.Diff press is the press diff betwn suction and l.o press in
comp. sump bcz suction is connected to the compressor there is
aiways press inside the comp ,if l.o is finished then comp will
damage bcz press is there inside so to knw the lo is there or not
there is alway a diff. Press gauge and it is normally 2.5-4
bar.kamath227testing starting air vvif u want to test starting air
valve with 30bar pr trassi nu keh we will close the air to
distrubutor and keep all the indicator cocks open open starting air
automatic valve and check from each unit indicator cock whether air
is coming or not or use soap solution is u want to check minor
leakage of starting air valve alsoTrassi228Function of chlorinator
chamber in sewage treatment plant. Why we are adding tablets in
sewage treatment plantWe want to killl aerobic bacteria before
discharging in sea bcse if u are dischrging aerobic bacteria so its
consumed oxygen and its harmful to our sea life thts why we kill
bacteria in chlorination chamber229Why compressor is used in vapour
comp. Cycle.what is lub oil pressure in compressoraccording to 2nd
law of thermodynamics ,heat can only be transferred from a source
at low temperature to a sink at high temperature if work is done on
the system. .now compressor is used for this as it sets the
refrigerant above critical pressure so that the refrigerant is in
liquid form when it enters the condensor
...................................... to compress high pressure
high temp gas into liquid, and maintaining the flow of
refferigerent through the ckt, lube oil press 4-6 bar maintain 2-3
bar of differential presure refferigerent press inlet 2.5-3 bar and
outlet 12-15bar230Function of deaerator.Undissolved
gases...including trapped air can be released to expansion tank
through a point highest in line for deaeration.....mishra231Types
of expansion valves. TEV, is there any by-pass line for it. How
does electronic expansion valve work.mishra232What will happen to
interface if smaller size gravity disc is usedkamath233Types of Air
Conditioning Systems and which type on your ship.Reheat system,
Double duct system, Zone control systemmishra234Butt clearance of
piston rings in aux engine..how to measureTrassi235in reference to
nomogram chart why do we prefer smaller diameter of gravity discs
for higher specific gravity of liquid....if the specfic gravity of
the bunker to be treated is high ,the oil component higher specific
gravity will tend to go far away from the center of rotation ,so
the interface will shift outwards and the oil will start
overflowing from water outlet ..so we will use a smaller dia
gravity disc to maintain the interface inwards ...............coz
in the purifier in order to maintain interface the pressure on
either side of interface should be same if rho increses that will
be compensated by decreasing size of disk236Why lip clearance is
given? Why cant we fit relief valve on boiler?how to measure lip
clearanceWith the help if lip clearance we are incresing the area
of a seat so more force acting on a valve so we acheive d/ 12 witg
the help of lip seal and clearance we are measure frm feeler
gauge.. We dont use relief v/v bcoz we want to release the excess
stm press. And to attain blowdown effect which is not possible in
relief v/v........... Lip clearance is not measured by filler
gauge..it is measured by lead ball at least 4 in no. And tighting
the bolts at required torque..then measuring the compresion by
vernier caliper of micrometer..237do we have air distributors on 4
aux engines.... arent dey air motor started???.. and how to adjust
compression pressure of a running engine...larger generators in
yanmar are started by air start valves and air distributor ie. same
as how the main engine is started .. My previous ship had air
distributor .. but most of them are air motor started. compression
pressure of a running generator can be increased by either removing
the turbocharger felt filter ( or changing if choked ) to increase
the air intake OR by throttling the air cooler cooling water so
that the temp of the turbocharged air is decreased even further to
increase the density and thereby increasing the air intake
...238explain how air distibutor worksthere are 3 types of air
distributors ... radial , in line and rotary . the generaotors and
most of the newer main engines in MAN B&W have rotary type,
where two plates , one rotating with the camshaft and one
stationary , have holes , and these match to send air to a
particular unit .. the diagram of this type is very complex and not
easy to understand...... the older ones have either in line or
radial , its explaination is quite simple239what is the difference
between expansion valve of a.c. and refer system?in AC AKV
(Automatic) type expansion valve used...these are pulse
modulated....electronically PI controlled valve. in reefer we are
using the normal Superheat control thermostatic expansion
valve.240What is the use of umbrella sealIt is a seal, actually
like a leap seal leaded from inside by spring to prevent the mixing
and thereafter contamination of cam lub oil by fuel oil.It was
introduced due to failure of sealing ring at high temperature and
losing its elastic sealing property..........help the lube oil
contamination from fuel in the MAN engines241what are the washer
springs, where used in aux engine?In rotocap..To rotate
spindle242Function of hunting gear1. Hunting gear floating lever
mechanism is required to bring the rudder to the ordered position.
2. Also this mechanism is required to position the rudder in its
ordered position when the action of water waves or propeller force
displaces the rudder from its ordered position.243What is the
difference between fuel valve opening pressure and fuel injection
pressure?300 liftng pr 950 injctng pr... its mre coz back pressure
will also be there...244what is blow down ring in safety valve?its
present in the safety valve just besides the valve seat to direct
the flow of steam and prevent any unnecessary loss of steam
!!245What is propeller push up??Propeller push up means push our
boss frm zero point to given distance by the maker with the help of
dial gauge and pilgrim nut or hydraulic jack.... or by skf system
Initially while fitting propeller a marking is made,then as said by
virendra wth help of hyd pump pilgrim nut 70 bar pressure is given
to push the propeller..and the distance to be observd..this
difernce in initial mrking and new distance is push up.............
before putting hub we do reference marking and then we put 70 bar
pressure on hub and try to push the hub till tht point after
reaching tht point again mark 40 mm frm hub to shaft after making
calculate the distance btween two points so u got ur zero points
then we use makers recommendation values for accoto temp of hub and
tail and pressure given by makers............ First a fall we put
hub on a tail shaft with a pressure of 65 bar with pilgrim nut then
maake ref mark 25 mm frm fwd end of the hub then put dial gauge on
hub and then apply full oressure and finalky reach tht point and
again second mark of 25 mm frm fwd end of the hub and after pushup
measure distance between two reference marks noted...246if a pump
is used to pump 2 cargos with different SG and pump trips wen
pumping the higher SG one... wat 2 do.. other than heating or
cooling of cargo.by decreasing the speed of pp247how will u
assemble overhauled fuel pump? How the barrel is fitted? How it is
ensures that rack is fitted properly? What is the speciality of
delivery valve?the delivery valve is a non return type there is a
collar below the smal valve disc which wil release the presure of
the delivery line before closing the valve..bt that delvry line wil
remain primed without of pressure..kamath248How do you perform Cyl
Head pressure test (Aux Engine)?First a fall take ouut cylinder
head and remove all valves frm the head and then clean ur head with
emry paper and after cleaning we will put wooden plug or teflon
plug in water inlet side and then cover water outlet side with
flanges and connect pressure gauge and water prividing plug in one
flange for testing then apoly 1.5 times pressure of a working
pressure then u chck any leakages so u will easily one main
precaution u will tke before leak use alwayss tested chain block
and put cylinder head akways on wood for avoiding surface wear down
....249Refrigeration charging @ high pressure side .why?Bcse bro
when u charge a liquid so we will charge frm high pressure side and
if gas will go in tht line so no prb but if u are charging gas frm
low pressure side and at a time of charging if liquid go on low
pressure side so chances of compressor damage thts why we always
charge at high pressure side250action if oil comes in evaporatorU
can bring lp setting to below atm pr so that oil gets sucked by
compr. Clean the oil separator Hot gassing by increasing ref temp
by throttling condr sw Nitrogen purging of full coil251shipside
valve is leaking in engine room, what actions to be taken??inform
company,keep energency bilge suction stand by... manage wit out
pumping out for the maximum time... if not under control wit
informing administration approvel we can pump out.. if leak is
small and manageable wait for company to arrrange drdock.. and get
repaired...(not to open sipside valves at sea or port * unsafe
practice)252In parallel operation 1 gen taking more load than
other....reason??1.governor wrong setting, or malfunction (less
rpm)2.avr problem, less exitation voltage , diodes damaged 3.loose
connection in gen terminal box or in bus bar connection 4.less
insulation in windings 5.walt metter showing wrong reading
...253what all checks to be done before fitting new stud..??Check
the thread.pitch of the thread..size and length of the stud should
be same. Before fitting clear inside with WD 40 or with any rest
remover,or clear the thread with proper size of Tap...using check
nut fit the stud.254Why we blow through engineThis water in
incompressible..and can cause a severe damage to liner ..to remove
ths we blow through and observe the content coming out255what is
steering system safety?SWITCH LEVEL 1:The steering system has two
lube oil tank system with 2 rams functioning on each system.
Thelevel switch 1gives an initial alarm following a loss of oil
from either system. In normal operation one power unit provides
hydraulic power to all four rams.The causes for the loss of oil is
mainly due to broken hydraulic pipes and damage in the ram, thus
the leakage oil drains to the bilge well.SWITCH LEVEL 2:When no
action is taken immediately upon the previous alarm, the loss of
oil continuesand over a period of time this loss of oil intiates
one or both of the level switches 2. This leads to the energization
of a solenoid operated servo valve causing a combined isolating
valve and bypass valve to operate. Thus splitting the system such
thateach power unit supplies power to 2 rams only .At the same time
this switch automatically starts the other standby helesaw pump to
assist the turning and building up the pressure in the rams.SWITCH
LEVEL 3:This switch will get activated when there is still no
further improvement in the loss of oil on the faulty side. In such
a situation thesteering continues un-interupted if one unitis
stopped and thus the rudder is turned with the help of the other
unit system of 2 rams only, isolating the faulty one, and this is
called as emergency steering.Thus the steering system is designed
to work at half of the maximum torque on thesteering system.The
defective system is put out of action and isolated.RELIEF VALVE:A
relief valve is fitted in the system to prevent over pressure in
the hydraulic system due to shock loading of rudder. Shock loading
of the rudder could occur in a variety of cases such as bad
weather.MANUAL BY PASS VALVE:This valve is only operated when there
is a failure of the one of the systems and the rudder stock has to
be turned mechanically, so that the ideal fluid can flow from the
high pressure side to low pressure side.LOW PRESSURE VALVE :Low
pressure valve is a NON RETURN VALVE fitted in the main hydraulic
pressureline, which opens for oil filling from a header tank if a
low pressure situation occurs in the system .ELECTRICAL STOPPER:It
stops the hydraulic pump when the position of the rudder turning is
at an angleof 36o. It automatically cuts of the supply because it
is the maximum turning angle ofrudder. (It normally operates at
35oangle).MECHANICAL STOPPER:In case of electrical stopper fails,
the mechanical stopper is provided so that it stops the tiller arm
after 36oangle of rudderElectrical motor overload alarmWhen ever
hydraulic motor or helesaw pump motor draws excessive current
during bad weather, the steering should not fail. Instead it gives
an alarm about excessive current being drawn by the motor.
Continued recurrence of this alarm could mean that the electrical
motor might burn up.POWER FAILURE ALARM:The full power failure
alarm will be raised if the power fails in black out condition.
Emergency power should be arranged with in 45 seconds and the
emergency generator must be capable to give power for at least 30
minutes for a big ship and 10min in case of small ships (ships