CERTIFICATES OF COMPETENCY IN THE MERCHANT NAVY · 2016-04-28 · ENGINEERING KNOWLEDGE - GENERAL Attempt TEN questions only as follows: SIX questions from section A TWO questions

EXAMINATIONS ADMINISTERED BY THE SCOTTISH QUALIFICATIONS AUTHORITY

ON BEHALF OF MARITIME AND COASTGUARD AGENCY

SECOND ENGINEER (UNLIMITED)

042-27 - ENGINEERING KNOWLEDGE - GENERAL

MONDAY, 15 December 2014

0915-1215 hrs

Examination paper inserts:

Notes for the guidance of candidates:

Materials to be supplied by examination centres:

CERTIFICATES OF COMPETENCY IN THE MERCHANT NAVY - MARINE ENGINEER OFFICER

Candidates are required to obtain 50% of the total marks allocated to this paper to gain a pass AND also obtain a minimum 40% in Sections A, B and C of the paper.

Candidate's examination workbook

ENGINEERING KNOWLEDGE - GENERAL

Attempt TEN questions only as follows:SIX questions from section ATWO questions from section BTWO questions from section CMarks for each part question are shown in brackets

Section A

1. With reference to a large reciprocating refrigeration compressor fitted with a safety head:

(a) sketch a cross section through one cylinder and cylinder cover; (6)

(b) explain the reason for fitting the safety head; (2)

(c) explain the reasons an unloader is fitted. (2)

2. (a) Explain EACH of the following metallurgical processes:

(i) fretting; (3)

(ii) fretting corrosion. (3)

(b) State TWO situations where fretting may occur. (2)

(c) State TWO situations where fretting corrosion may occur. (2)

3. With reference to control systems, explain EACH of the following:

(a) two-step action; (2)

(b) offset; (2)

(c) gain; (2)

(d) proportional action; (2)

(e) integral action. (2)

4. (a) As second engineer officer, list the instuctions for completeing the entries in the oil record book. (6)

(b) State where the Codes are found and give examples of ONE operation, giving the Code and Item Number. (4)

5. (a) Describe, with the aid of a sketch, the operation of a tilting pad shaft bearing, indicating how the load is distributed. (6)

(b) Explain the advantages of tilted pad shaft bearings compared to plain bearings. (4)

6. Describe, with the aid of a sketch, a two stage emergency fire pump which utilises a hydraulic pump and motor and is suitable for use in very large ships. (10)

7. (a) Describe a method of ship stabilisation that employs a passive tank system. (4)

(b) State THREE advantages and THREE disadvantages of the system described in part (a). (6)

8. With reference to lifeboat engines:

(a) state THREE reasons that may contribute to difficulty in starting; (3)

(b) explain why a short run as part of routine testing does not give a true indication of the engine condition; (4)

(c) describe how the engines are kept at a state of full readiness. (3)

Section B

9. Explain, with the aid of a circuit diagram, the operation of a synchroscope. (10)

10. With reference to ships' batteries:

(a) compare the merits of lead acid to alkaline cells; (2)

(b) list safety precautions to be taken when working on batteries; (4)

(c) describe the construction of battery storage space. (4)

11. (a) Sketch a circuit showing how the emergency generator is started, connected to the emergency busbars and how the main busbars are disconnected in the event of a blackout. (6)

(b) Explain how an emergency generator can be tested to ensure that it is capable of satisfactorily delivering the rated power. (4)

Section C

12. With reference to weathertight doors:

(a) sketch a weathertight door; (4)

(b) sketch the edge sealing arrangement; (2)

(c) state the routine maintenance required; (2)

(d) describe how the function may be tested. (2)

13. With reference to double bottom fuel tanks:

(a) state why weighted cocks are fitted to the tank sounding pipes; (2)

(b) state the purpose of air pipes; (2)

(c) state the design features incorporated on air pipe vents with respect to EACH of the following:

(i) heavy weather; (2)

(ii) fire; (2)

(iii) bunkering. (2)

14. (a) Describe EACH of the following framing systems:

(i) transverse; (3)

(ii) longitudinal; (3)

(iii) combined. (3)

(b) State an appropriate vessel for one of the stated framing types. (1)





MONDAY, 13 October 2014

0915-1215 hrs









Section A

1. Sketch EACH of the following electric arc welding defects, stating the cause of EACH defect:

(a) undercutting; (2)

(b) porosity; (2)

(c) lack of penetration; (2)

(d) lack of fusion; (2)

(e) slag inclusion. (2)

2. (a) Sketch a bourdon tube type pressure gauge. (5)

(b) Describe the operation of the gauge sketched in part(a). (3)

(c) State the meaning of EACH of the following:

(i) gauge pressure; (1)

(ii) absolute pressure. (1)

3. (a) Describe, with the aid of a sketch, the construction and operation of a gear type pump, indicating the flow of fluid. (6)

(b) State the materials that gear type pump components may be manufactured from. (2)

(c) State TWO applications that are suitable for the employment of gear pumps. (2)

4. (a) Describe a method of checking main transmission shaft alignment which does not involve the removal of coupling bolts. (5)

(b) State why the shaft alignment should be checked when the ship is afloat in a light condition. (1)

(c) A shaft system is excessively misaligned so as to cause serious bending of the shaft. State what effect this could have on EACH of the following:

(i) the shaft coupling bolts; (1)

(ii) the shaft bearings; (1)

(d) State, with reasons, which of the effects stated in part (c) would cause most concern. (2)

5. (a) Sketch a four ram electro-hydraulic steering gear system. (5)

(b) Explain the operations necessary to enable a four ram system to operate on two rams only. (3)

(c) State the regulations pertaining to the main and auxiliary steering gear with reference to the rudder angle and time of operation. (2)

6. In a vapour compression refrigeration system, state how EACH of the following faults are indicated and how they are remedied:

(a) air in the refrigerant; (2)

(b) oil in the refrigerant; (2)

(c) moisture in the refrigerant; (2)

(d) undercharge of the refrigerant; (2)

(e) overcharge of the refrigerant. (2)

7. With reference to the supply air for pneumatic control systems, explain the purpose of EACH of the following components:

(a) compressor suction filters; (2)

(b) filter/separator fitted between compressor and air receiver; (4)

(c) filter-dryers fitted between receivers and air mains. (4)

8. With reference to a major fire in the machinery space:

(a) explain why EACH of the following equipment is shut down remotely, stating how it is achieved:

(i) settling and service tank valves; (2)

(ii) fuel transfer and supply pumps; (2)

(iii) mechanical and natural ventilation; (2)

(b) state how the fire is brought under control using the facilities available outside the affected machinery space. (4)

Section B

9. (a) Explain why compartments containing batteries are vulnerable to the risks of explosion and fire. (2)

(b) List the means undertaken to reduce the risks of explosion and fire in battery lockers. (8)

10. (a) Sketch a section through an a.c. induction motor. (5)

(b) Describe the construction of the motor sketched in part (a). (5)

11. With reference to braking of a.c. induction motors:

(a) explain why braking may be required; (2)

(b) explain why electrical braking is preferable to mechanical braking; (2)

(c) explain the term plugging; (2)

(d) describe how dynamic braking is achieved. (4)

Section C

12. (a) Describe the circumstances under which EACH of the following tests are carried out on a ship in dry dock:

(i) hose; (2)

(ii) hammer; (2)

(iii) ultrasonic. (2)

(b) State, with reasons, which parts of the external plating require the closest attention when in dry dock. (4)

13. (a) Explain the purpose of transverse watertight bulkheads. (2)

(b) Describe, with the aid of a sketch, how EACH of the following are sealed when passing through a watertight bulkhead:

(i) an electrical cable; (4)

(ii) transmission shaft; (4)

14. With reference to the construction of refrigerated spaces:

(a) state suitable materials used for insulating the spaces; (2)

(b) state the properties that an insulating material should possess; (3)

(c) sketch a section through a wall of a cold storage space detailing how the insulation is attached to the ship's structure. (5)





MONDAY, 21 July 2014

0915-1215 hrs









Section A

1. A lubricating oil centrifugal purifier runs smoothly at rated speed, with clean bowl and correctly fitted dam ring.

(a) State, with reasons, the factors that may maladjust the interface. (4)

(b) Describe, with the aid of a sketch, the correct operating position of the interface, stating how the dam ring achieves this. (4)

(c) State the factors that affect successful separation. (2)

2. (a) Sketch a simple cross-section through a single stage centrifugal pump with a fully shrouded single entry impeller, naming the component parts and indicating the direction of fluid flow. (5)

(b) Describe a routine overhaul for the pump sketched in part (a), stating the clearances that would be checked. (5)

3. With reference to fixed fire fighting systems employing water in fog or mist form, explain EACH of the following:

(a) how the fire is contained and extinguished; (4)

(b) the importance of particle size and flow rate; (4)

(c) the routine test carried out, stating any subsequent problems that may occur. (2)

4. With reference to propeller shaft support bearings:

(a) sketch a bearing of the tilting pad design, showing how the oil pressure is distributed; (6)

(b) explain why this type of bearing evolved, stating the advantages over plain bearings. (4)

5. Sketch EACH of the following electric arc welding defects, stating the cause of EACH defect:

(a) undercutting; (2)

(b) porosity; (2)

(c) lack of penetration; (2)

(d) lack of fusion; (2)

(e) slag inclusion. (2)

6. With reference to vapour-compression refrigeration systems, explain the purpose of EACH of the following:

(a) compressor; (2)

(b) condenser; (2)

(c) expansion valve; (2)

(d) evaporator; (2)

(e) room thermostat. (2)

7. With reference to a low heat source evaporator:

(a) state the regulations pertaining to the evaporator if the distillate is to be used for human consumption; (4)

(b) describe how a leaking condenser tube would be indicated, identified and rectified. (6)

8. With reference to control systems, explain EACH of the following:

(a) two-step action; (2)

(b) offset; (2)

(c) gain; (2)

(d) proportional action; (2)

(e) integral action. (2)

Section B

9. (a) Sketch a standby emergency battery circuit which is charged by a.c. supply. (6)

(b) List the safety precautions to be observed during the routine maintenance of acid and alkaline batteries. (4)

10. With reference to the electrical protection of a.c. induction motors:

(a) state, with reasons, the type of fuses that are employed; (3)

(b) explain the effects of single phasing, stating how the protective devices should operate; (5)

(c) state why after an overcurrent trip the motor should not be repeatedly started and how doing so is prevented. (2)

11. (a) Sketch a shipboard connection that will enable a ship's electrical system to be supplied from shore. (5)

(b) Describe the arrangement sketched in part (a), stating the checks and precautions to be taken before the ship's electrical system is energised from the shore supply. (5)

Section C

12. With reference to double bottom fuel tanks:

(a) state why weighted cocks are fitted to the tank sounding pipes; (2)

(b) state the purpose of air pipes; (2)

(c) state the design features incorporated on air pipe vents with respect to EACH of the following:

(i) heavy weather; (2)

(ii) fire; (2)

(iii) bunkering. (2)

13. (a) Sketch a weathertight door, showing how the edges are sealed. (6)

(b) State the routine maintenance required for a weathertight door. (2)

(c) Describe how the function of a weathertight door may be tested. (2)

14. (a) Explain the purpose of cofferdams. (2)

(b) State TWO areas where cofferdams may be situated. (2)

(c) State the procedure undertaken prior to entering cofferdams. (6)





MONDAY, 07 April 2014

0915-1215 hrs









Section A

1. With reference to centrifugal separators, explain EACH of the following:

(a) the function and operation of the lower paring disc; (2)

(b) how the correct paring disc height is ascertained; (2)

(c) how the paring disc height may be adjusted; (2)

(d) the function of the buffer springs; (2)

(e) how the bowl spindle run out is measured. (2)

2. With reference to a pneumatically operated control valve:

(a) state FOUR reasons for fitting a positioner; (4)

(b) explain valve hysteresis and how it affects the process; (2)

(c) outline the immediate action to be taken to restore automatic control upon failure of the positioner bellows; (2)

(d) state the difference between fail safe and fail set. (2)

3. (a) Sketch a variable delivery, constant speed, uni-directional, reversible flow pump suitable for steering gear or deck hydraulic systems. (5)

(b) Describe the operation of the pump sketched in part (a). (5)

4. With reference to a keyless propeller designed for hydraulic (wet) fit and withdrawal:

(a) describe how the propeller is:

(i) fitted to the propeller shaft; (4)

(ii) withdrawn from the propeller shaft. (2)

(b) state TWO advantages compared to a dry fit; (2)

(c) explain how the thrust is transmitted without the use of a key and keyway. (2)

5. With reference to rotary vane steering gears:

(a) sketch a section through a rotary vane type steering gear; (4)

(b) describe how rudder movement is effected; (2)

(c) state the function of the anchor bolts; (2)

(d) state ONE advantage and ONE disadvantage of a rotary vane compared to a ram type. (2)

6. With reference to a large reciprocating refrigeration compressor fitted with a safety head:

(a) sketch a cross section through one cylinder and cylinder cover; (6)

(b) explain the reasons for fitting the safety head; (2)

(c) explain the reasons an unloader is fitted. (2)

7. (a) Sketch a single stage flash evaporator, labelling the component parts and indicating the directions of flow. (5)

(b) Explain the term flash evaporation. (1)

(c) State the regulations governing the operation of an evaporator if the distilled water is intended for human consumption. (4)

8. Explain the purpose of EACH of the following components of an inert gas system which utilises exhaust gas:

(a) scrubber; (3)

(b) deck seal; (3)

(c) pressure-vacuum valve. (4)

Section B

9. With reference to braking of a.c. induction motors:

(a) explain why braking may be required; (2)

(b) explain why electrical braking is preferable to mechanical braking; (2)

(c) explain the term plugging; (2)

(d) describe how dynamic braking is achieved. (4)

10. (a) Explain why many modern vessels are fitted with a.c. generators which produce 6,600 volts. (4)

(b) Sketch a 6,600 volt electrical distribution system from the generators to the lowest voltage consumers. (6)

11. (a) With reference to earth fault lamps, describe, with the aid of a sketch, EACH of the following:

(i) a single earth on a circuit; (2)

(ii) two earths on a circuit; (2)

(iii) the operation of an earth resistance meter. (4)

(b) Explain how an earth could be traced to a particular circuit. (2)

Section C

12. Describe, with the aid of a sketch, the constructional details of a hollow rudder. (10)

13. (a) Sketch a cross-section through the forward end of a ship incroporating a bulbous bow, showing constructional details. (8)

(b) State TWO advantages of fitting a bulbous bow. (2)

14. (a) With reference to weatherdeck cargo hatch covers, state, with reasons, the type of vessel that would be equipped with EACH of the following:

(i) lift off; (2)

(ii) rolling; (2)

(iii) folding. (2)

(b) Sketch a low friction sliding bearing which will transmit the weight of a large, heavy hatch cover to the ship's hull. (4)





MONDAY, 09 December 2013

0915-1215 hrs









Section A

1. With reference to shell and tube type coolers:

(a) sketch a longitudinal section through a cooler; (6)

(b) explain how expansion is catered for; (2)

(c) state, with reasons, the location of cavitation and erosion damage. (2)

2. (a) State the possible causes for EACH of the following auxiliary engine lubricating oil sample results:

(i) high acidity; (2)

(ii) high sediment content; (2)

(iii) water content; (2)

(iv) fuel dilution. (2)

(b) Explain which of the results in part (a) would give greatest concern. (2)

3. State a typical shipboard machinery application for EACH of the following metals, explaining how their properties make them particularly suitable for the stated application:

(a) stainless steel; (2)

(b) grey cast iron; (2)

(c) manganese bronze; (2)

(d) aluminium; (2)

(e) titanium. (2)

4. With reference to engine room bilge systems:

(a) state, with reasons, a type of pump used as an oily water separator supply pump; (2)

(b) state FOUR possible causes for an engine room bilge pump being unable to pick up suction from a bilge well; (4)

(c) describe how a hole in a bilge main pipe may be located. (4)

5. (a) Sketch a low heat source evaporator, labelling the component parts and indicating the directions of flow. (5)

(b) Describe how the evaporator sketched in part (a) is started up and put on line to the domestic water tanks. (5)

6. With reference to a vapour compressor refrigeration system:

(a) describe, with the aid of a sketch, the operation of a high pressure cut out device; (6)

(b) state FOUR possible faults that could cause the cut out to operate. (4)

7. (a) Sketch a bearing which carries the weight of the rudder stock. (5)

(b) Describe how the bearing sketched in part (a) transmits the load to the hull. (2)

(c) Explain why a rudder may tend to lift, stating how this tendency is countered. (3)

8. As Second Engineer Officer, write a fire drill scenario for a fire in the purifier room. (10)

Section B

9. With reference to a.c. induction motors:

(a) state, with reasons, the type of fuses used for protection; (3)

(b) explain the effects of single phasing; (2)

(c) describe how thermistors can be used to protect the motor; (3)

(d) sketch a cross section of a thermistor. (2)

10. Describe, with the aid of a circuit diagram, a two speed induction motor with independent windings. (10)

11. Explain the operating principle of the Automatic Voltage Regulator (AVR) shown in the figure. (10)

Fig Q11

Section C

12. (a) State why ships' accommodation spaces require to be ventilated even when they are air conditioned. (3)

(b) Sketch a mushroom ventilator as fitted on an accommodation structure. (5)

(c) Describe the routine maintenance carried out on the ventilator sketched in part (b). (2)

13. Describe the stresses a ship is subjected to when in a dry-dock, stating how these stresses are resisted. (10)

14. (a) Describe how EACH of the following defects on a solid propeller may be repaired whilst in dry dock:

(i) bent blades; (3)

(ii) damaged blade tips; (3)

(iii) pieces of missing blade. (3)

(b) State the authority who would oversee the repairs of the propeller. (1)





MONDAY, 14 October 2013

0915-1215 hrs









Section A

1. State, with reasons, the materials used in EACH of the following components of a centrifugal pump for sea water circulating duties:

(a) casing; (2)

(b) impeller; (2)

(c) shaft; (2)

(d) wear rings; (2)

(e) mechanical seal. (2)

2. Describe, with the aid of a sketch, the operation of a system for remote indication of the level of water in an auxiliary boiler. (10)

3. (a) Sketch a single cylinder, double acting reciprocating pump, labelling the component parts. (6)

(b) State how pressure fluctuations are dampened. (1)

(c) State, with reasons, the duties that the pump sketched in part (a) is particularly suited. (3)

4. When on deep sea passage, as Second Engineer Officer, on entering the engine room you are met with the following scenario: a strong smell of sewage effluent; sewage treatment plant showing high level alarm; aft bilge well in high alarm; sewage discharge pump running but amperes reading low. State the actions to be taken and maintenance required to restore the plant to correct working order. (10)

5. (a) Sketch a stern tube lubricating oil system. (5)

(b) Explain why some vessels require more than one stern tube header tank. (2)

(c) Describe the arrangement which prevents both oil loss and sea water ingress, at the tailshaft. (3)

6. (a) Describe a method of ship stabilisation that employs a passive tank system. (4)

(b) State THREE advantages and THREE disadvantages of the system described in part (a). (6)

7. (a) Sketch a cross section through a room solenoid valve used in a provisions refrigerating plant. (5)

(b) Describe the operation of the valve sketched in part (a) making reference to the cold room temperature. (3)

(c) Explain how solenoid valves affect the operation of a refrigeration compressor. (2)

8. Describe, with the aid of a sketch, an explosimeter for the detection of combustible gas. (10)

Section B

9. (a) Sketch a section through an a.c. induction motor. (5)

(b) Describe the construction of the motor sketched in part (a). (5)

10. With reference to the protection of High Voltage electric a.c. motors:

(a) state the type of fuse that is fitted and how it prevents single phasing; (3)

(b) describe the operation of EACH of the following direct temperature sensors:

(i) resistance temperature device; (3)

(ii) thermistor. (4)

11. (a) Sketch a circuit that allows both trickle charging and fast charging of lead -acid batteries. (6)

(b) State, with reasons, why trickle charge and fast charge provision is necessary. (2)

(c) Explain why lead-acid batteries may have to be taken off charge in hot climates. (2)

Section C

12. (a) Sketch a midship section of a ship, labelling EACH of the following:

● camber ● bilge radius ● bilge keel ● flat of bottom ● rise of floor

(5)

(b) State FIVE terms used to describe the conditions that relate to the distortion a hull undergoes, stating in EACH case, the stresses involved. (5)

13. (a) Sketch a sea chest suitable for the connection of a main sea water inlet valve, labelling all of the fittings. (5)

(b) Explain why a bilge injection valve is incorporated into the main sea water system, describing how it is tested. (4)

(c) Compare the valve diameters of the bilge and main injection valves. (1)

14. With reference to ship's lifeboats:

(a) sketch a main brake; (5)

(b) state the safety features incorporated in the brake should the operator:

(i) let go of the brake handle completely during lowering; (1)

(ii) attempt to lower the lifeboat too quickly; (1)

(c) state the maximum rate of descent when launching; (1)

(d) explain how the lifeboat is protected from falling back into the water if the power fails when hoisting the boat. (2)





MONDAY, 15 July 2013

0915-1215 hrs









Section A

1. With reference to hydraulically loaded bolts.

(a) state FOUR applications; (4)

(b) state FOUR advantages; (4)

(c) explain why regular maintenance of hydraulic tension equipment is essential. (2)

2. With reference to plate type heat exchangers:

(a) sketch a sectional view of the flow in both fluid systems, labelling all major components and showing the direction; (6)

(b) state TWO reasons for plate relief patterns: (2)

(c) state the FOUR advantages of a plate cooler compared to shell and tube type. (2)

3. (a) State why it is essential to sterilise fresh water for potable use on board ship. (1)

(b) State why re-mineralisation of potable water is carried out.. (1)

(c) Describe, with the aid of a sketch, a method of fresh water purification employing the use of silver ions. (6)

(d) State ONE advantage and ONE disadvantage of ultraviolet radiation sterilisation for fresh water. (2)

4. With reference to routine testing of equipment, explain how EACH of the following is tested to ensure it operates at the correct set point:

(a) stand-by facility for sea water cooling water pump; (2)

(b) high jacket water temperature alarm for generator; (2)

(c) auxiliary boiler flame failure; (2)

(d) differential pressure across fuel filter; (2)

(e) control air pressure low alarm. (2)

5. (a) Sketch a multi bottle CO2 flooding system suitable for a main machinery space. (5)

(b) Describe the procedure for releasing the CO2 into the engine room. (5)

6. (a) Sketch a fully automatic provision refrigeration system incorporating a number of cold rooms. (5)

(b) Explain the sequence of events from demand for refrigerating effect in a room until the room has reached the desired temperature. (5)

7. Describe, with the aid of a sketch, the operation of a rotary vane steering gear with constant delivery pumps. (10)

8. (a) Explain, with the aid of a sketch, the operation of a centrifuge for removing water and particles from lubrication oil. (8)

(b) Explain the main differences when the centrifuge is used as a clarifier. (2)

Section B

9. With reference to electrical switchgear:

(a) explain why it is necessary to keep electrical contactors clean and closed with a firm contact pressure; (5)

(b) describe the functions of auxiliary contacts; (3)

(c) state how contacts are kept free from oxide formation. (2)

10. Explain, with the aid of a circuit diagram, the operation of ships navigating lights. (10)

11. (a) Explain the term power factor. (2)

(b) Explain why it may be desirable to change the power factor. (2)

(c) Explain how a synchronous motor may be used to assist in power factor correction. (6)

Section C

12. (a) Explain the purpose of cofferdams. (3)

(b) State TWO locations where cofferdams may be found. (2)

(c) State the precautions prior to entry into a cofferdam. (5)

13. With reference to ship construction, describe EACH of the following, stating where EACH may be located:

(a) duct keel; (3)

(b) bilge keel; (2)

(c) flare; (2)

(d) camber. (3)

14. (a) Sketch a bearing which carries the weight of the rudder stock. (5)

(b) Describe how the bearing sketched in part (a) transmits the load to the hull. (2)

(c) Explain why a rudder may tend to lift, stating how this tendency is countered. (3)





MONDAY, 25 March 2013

0915-1215 hrs









Section A

1. State a typical shipboard machinery application for EACH of the following metals, explaining how their properties make them particularly suitable for the stated application:

(a) stainless steel; (2)

(b) grey cast iron; (2)

(c) manganese bronze; (2)

(d) aluminium; (2)

(e) titanium. (2)

2. (a) Sketch an engine room fresh water central cooling system, indicating the water temperatures at salient points on the system. (6)

(b) State FOUR advantages of the system sketched in part (a) compared to one which is totally sea water cooled. (4)

3. (a) Sketch a tunnel type transverse bow thruster driven by a constant speed electric motor. (6)

(b) Describe the thruster sketched in part (a), stating how the direction and strength of thrust are varied. (4)

4. (a) Sketch a hydraulically tensioned shaft coupling bolt which incorporates a tapered sleeve fitted between the bolt and the coupling holes. (4)

(b) Describe how the bolt assembly sketched in part (a) is fitted. (3)

(c) State the advantages of this type of arrangement compared to conventional bolt assemblies. (3)

5. (a) State the possible causes for EACH of the following auxiliary engine lubricating oil sample results:

(i) high acidity; (2)

(ii) high sediment content; (2)

(iii) water content; (2)

(iv) fuel dilution. (2)

(b) Explain which of the results in part (a) would give greatest concern. (2)

6. (a) Sketch a fully automatic provisions refrigeration system incorporating a number of cold spaces. (5)

(b) Explain the sequence of events from a demand for refrigerating effect until all cold rooms have fully cooled down. (5)

7. With reference to the protection of mild steel main sea water cooling pipelines:

(a) sketch an arrangement where impressed current anodes are fitted in the main sea chests to prevent corrosion and fouling; (4)

(b) describe how the system sketched in part (a) gives protection to steel pipework, stating the materials used; (4)

(c) explain why welding or hot work should not be carried out on sea water main lines. (2)

8. (a) Sketch a typical ship's firemain system. (5)

(b) Describe the routine maintenance carried out on the system sketched in part (a) to ensure that it is at readiness for emergency situations. (5)

Section B

9. (a) Sketch a standby emergency battery circuit which is charged by a. c. supply. (5)

(b) List the safety precautions to be observed during the routine maintenance of acid or alkaline batteries. (5)

10. (a) Sketch a direct on line starter suitable for a three phase induction motor. (8)

(b) Explain why the starter sketched in part (a) is limited to moderately sized motors. (2)

11. With reference to the protection of electrical power circuits:

(a) explain preferential tripping, describing how it is achieved; (5)

(b) explain discrimination, describing how it is achieved. (5)

Section C

12. (a) State why ships' accommodation spaces require to be ventilated even when they are air conditioned. (3)

(b) Sketch a mushroom ventilator as fitted on an accommodation structure. (5)

(c) Describe the routine maintenance carried out on the ventilator sketched in part (b). (2)

13. With reference to the construction of refrigerated spaces: (2)

(a) state suitable materials used for insulating the spaces; (2)

(b) state the properties that an insulating material should possess; (3)

(c) sketch a section through a wall of a cold storage space detailing how the insulation is attached to the ship's structure. (5)

14. As Second Engineer Officer, explain to a new crew member how to pass safely through a hydraulically operated watertight door. (10)

CERTIFICATES OF COMPETENCY IN THE MERCHANT NAVY – MARINE ENGINEER OFFICER

EXAMINATIONS ADMINISTERED BY THE

SCOTTISH QUALIFICATIONS AUTHORITY ON BEHALF OF THE

MARITIME AND COASTGUARD AGENCY

STCW 95 SECOND ENGINEER REG. III/2 (UNLIMITED)

042-27 – ENGINEERING KNOWLEDGE - GENERAL

MONDAY, 28 MARCH 2011 0915- 1215 hrs Examination paper inserts: Notes for the guidance of candidates:


Candidate’s examination workbook


[OVER

ENGINEERING KNOWLEDGE - GENERAL Attempt TEN questions only as follows: SIX questions from Section A TWO questions from Section B TWO questions from Section C Marks for each part question are shown in brackets All questions carry equal marks SECTION A Attempt SIX questions only from this section

1. With reference to steering gear: (a) describe, with the aid of a sketch, a hunting gear arrangement; (b) list the checks to be carried out 12 hours before departure.

(4)

(6)

2. Describe, with the aid of a sketch, the operation of an hydraulic servo mechanism incorporated in the boss of a controllable pitch propeller.

(10)

3. With reference to a pneumatic valve positioner incorporating a volume booster: (a) explain, with the aid of a sketch, the operation of a positioner; (b) outline the immediate action to be taken to restore automatic control upon failure of

the positioner bellows.

(8)

(2)

4. (a) Sketch a stress/strain curve for a mild steel specimen. (b) With reference to a stress/strain curve, explain EACH of the following:

(i) modulus of elasticity; (ii) percentage elongation; (iii) Ultimate Tensile Stress; (iv) Yield Stress.

(2)

(2)

(2)

(2)

(2)

5. With reference to a machinery space multi-bottle, carbon dioxide, fire extinguishing installation: (a) sketch a line diagram of the installation, labelling the component parts; (b) state, with reasons, FOUR important actions to be taken before releasing carbon

dioxide into the machinery spaces.

(6)

(4)

6. (a) Describe, with the aid of a sketch, an oil content monitor suitable for limiting the oil discharge to 15 p.p.m.

(b) State THREE operations that are legally required to be recorded in the oil record

book. (c) List the entries that will be made in the oil record book for ONE of the operations

stated in Q6(b).

(5)

(3)

(2)

7. (a) Sketch a low pressure controller designed to cut-out and restart the operation of a refrigeration compressor.

(b) Explain the operation of the controller sketched in Q7(a).

(6)

(4)

8. Describe, with the aid of a sketch, a water jet, transverse thruster. (10)

[OVER

SECTION B Attempt TWO questions only from this section

9. (a) Describe, with the aid of a sketch, a high rupturing capacity fuse. (b) Explain the term discrimination when applied to electrical protective devices. (c) State how over current devices are tested.

(4)

(4)

(2)

10. With reference to electric motors: (a) state FOUR reasons for overheating; (b) describe, with the aid of a sketch, a device to limit overload.

(4)

(6)

11. (a) Sketch a labelled block diagram of essential services provided from an emergency generator.

(b) Describe the testing procedure for an emergency generator.

(7)

(3)

SECTION C Attempt TWO questions only from this section

12. With reference to hydraulically operated watertight doors in the doors closed mode: (a) state the hazards associated with passing through doors; (b) describe a safe procedure for passing through doors.

(3)

(7)

13. With reference to a water ballast tank: (a) explain how corrosion may occur, stating how it may be minimised; (b) explain how the atmosphere in the tank may become hazardous due to the corrosion

process, the tests carried out prior to entry and the potential consequences of entering the hazardous atmosphere.

(6)

(4)

14. (a) Describe, with the aid of a sketch, a bulwark that incorporates freeing ports, explaining why this arrangement is fitted.

(b) Describe, with the aid of a sketch, a double bottom, oil fuel tank ventilator, with an

automatic valve.

(5)

(5)

CERTIFICATES OF COMPETENCY IN THE MERCHANT NAVY · 2016-04-28 · ENGINEERING KNOWLEDGE - GENERAL Attempt TEN questions only as follows: SIX questions from section A TWO questions

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