U.S.C.G. Merchant Marine Exam First Assistant … disassembling or assembling an injection pump...

National Maritime Center Providing Credentials to Mariners

U.S.C.G. Merchant Marine Exam

First Assistant Engineer

Q514 Motor Plants

(Sample Examination)

of 30 Q514 Motor Plants

8/30/2017

U.S.C.G. Merchant Marine Exam First Assistant Engineer Q514 Motor Plants Illustrations: 13

Choose the best answer to the following Multiple Choice Questions.

1. Uneven bolt tightening during the installation of a fuel injection pump can result in __________.

o (A) high torsional shock to fuel lines o (B) ignition delay • (C) binding of pump moving parts o (D) improper pump-to-engine timing

If choice C is selected set score to 1.

2. Constant capacity, pressure atomizing, fuel burners designed to meet a wide variation in steaming loads on an auxiliary boiler, are __________.

o (A) automatically supplied with warmer air on demand o (B) automatically supplied with more fuel on demand o (C) equipped with standard variable capacity atomizers • (D) cycled on and off in response to steam demand

If choice D is selected set score to 1.

3. Which of the following statements describes what will occur if the annular spaces, indicated by the letter "K" of the device shown in the illustration, became restricted? Illustration MO-0112

• (A) The bowl will fail to close when starting and the unit will not shoot when operating. o (B) The unit will not start due to pressure/time delay relays. o (C) The bowl will fail to close, but the unit will be capable of shooting while in operation. o (D) Operating water will be supplied through port "S".

If choice A is selected set score to 1.

4. Lube oil in the fresh water cooling system of a diesel engine may result from a __________.

o (A) lube oil sump overflow o (B) camshaft seizure • (C) lube oil cooler failure o (D) lube oil pump failure


5. When disassembling or assembling an injection pump plunger and barrel you should __________.

o (A) work over a linoleum-type surface o (B) always keep the plunger and barrel as a matched set o (C) keep the parts immersed in diesel fuel • (D) all of the above



8/30/2017

U.S.C.G. Merchant Marine Exam First Assistant Engineer Q514 Motor Plants Illustrations: 13 6. Heavy fuel oils generally have an upper average ash content of 0.1% by weight. Which of the

following conditions could be expected if the ash content increases above this amount?

• (A) Increased exhaust valve wear o (B) Increased MEP o (C) Excessive bearing wear o (D) Glazing of the cylinder liners


7. Which of the following statements describes the function of the device labeled "C" shown in the illustration? Illustration MO-0115

o (A) The device is a relief valve with feedback to prevent excessive pressure from damaging system components.

• (B) The regulator, or pressure reducer, drops the supply pressure to the desired operating level. o (C) The regulator reduces the pressure of the supply air to provide ancillary main engine services. o (D) Constant pressure is maintained at device "B" while device "C" is used only to modify the

output signal.

If choice B is selected set score to 1.

8. During main engine performance testing it is noticed that the firing pressure in one cylinder is lower than the average, but cylinder compression pressure and fuel pump delivery rate are normal. Which of the following would most likely be the cause?

• (A) Late fuel injection o (B) Worn piston rings o (C) Early fuel injection o (D) Low engine load


9. If the compensating needle valve of a hydraulic governor is opened more than necessary the governor will __________.

• (A) produce excessive speed response to a load change o (B) stabilize engine speed at the new governor setting o (C) have a larger than normal deadband o (D) respond slowly to any change in engine load



8/30/2017

U.S.C.G. Merchant Marine Exam First Assistant Engineer Q514 Motor Plants Illustrations: 13 10. Increasing the oil pressure acting on the power piston of the hydraulic governor shown in the

illustration will __________. Illustration MO-0092

• (A) increase the governor output power o (B) decrease the speed droop o (C) require the overspeed trip setting to be adjusted o (D) increase the speed droop


11. Which of the following statements represents the function of the plunger flange labeled "A" shown in the illustration? Illustration MO-0061

o (A) It prevents the plunger from rotating in the barrel. o (B) It limits the actual stroke of the plunger. o (C) It takes the plunger off stroke when injection is completed. • (D) It transmits the control rack setting to the plunger.


12. In a turbocharger, inlet air velocity is increased in the __________.

o (A) compressor outlet volute o (B) stationary diffuser passages o (C) inlet nozzle ring • (D) rotating impeller vanes


13. The ring lands on a large, low-speed, main propulsion diesel engine piston may crack due to __________.

o (A) high main lubricating oil system temperature • (B) insufficient ring groove clearance o (C) insufficient cylinder liner wear o (D) contaminated lubricating oil


14. Using the graph shown in the illustration, the oil being separated has a specific gravity of 0.87 kg/dm3 at 72.5°C. What will be the specific gravity if the temperature is lowered to 40°C? Illustration MO-0113

o (A) 0.872 kg/dm3 o (B) 0.882 kg/dm3 • (C) 0.892 kg/dm3 o (D) 0.902 kg/dm3



8/30/2017

U.S.C.G. Merchant Marine Exam First Assistant Engineer Q514 Motor Plants Illustrations: 13 15. When is fuel injected into a cylinder of diesel engines?

o (A) After combustion gases in the cylinder have expanded. o (B) As air is taken into the cylinder. • (C) After air in the cylinder is compressed. o (D) Before air in the cylinder is compressed.


16. In the illustrated engine, the main camshaft controls the timing of which of the following components? Illustration MO-0003

o (A) exhaust valves • (B) fuel pumps o (C) Intake valves o (D) all of the above


17. A safety valve on an auxiliary boiler simmers constantly and cannot be stopped by several quick blow-offs using the hand relieving gear. The problem may be __________.

o (A) loose dirt on the seat o (B) exposed valve springs o (C) a clogged drain line • (D) a damaged seat


18. When changing over from residual to distillate fuel on a slow-speed diesel propelled vessel, you should limit the rate of temperature change of the fuel in order to prevent what operational difficulty?

• (A) Seizing and scuffing of fuel pump plungers and injector needle valves due to thermal effects on close clearance components.

o (B) Dezincification of the fuel in the mixing tank. o (C) Surging/hunting of the governor due to rack sticking. o (D) Carbonization in the fuel heater.


19. The service life of a worn aluminum piston for an auxiliary diesel, for which no spares are readily available, can be extended by __________.

• (A) knurling the piston skirt surface o (B) increasing the dimensions of the ring land grooves o (C) building up the piston skirt with a liquid epoxy material and then re-machining o (D) turning down the piston skirt to concentric values



8/30/2017

U.S.C.G. Merchant Marine Exam First Assistant Engineer Q514 Motor Plants Illustrations: 13 20. High exhaust temperature and black smoke exhausting from an auxiliary diesel engine can be

caused by __________.

o (A) plugged fuel nozzle holes o (B) excessive compression pressure • (C) engine overload o (D) low combustion temperature


21. A 'Blotter test' is a test performed on the lube oil of a diesel engine which can determine ______.

o (A) the flash point of the oil o (B) the specific gravity of the oil o (C) the TBN number of the oil • (D) a change in the oils viscosity


22. As shown in the illustration, the function of component "1" is to ________. Illustration MO-0128

o (A) generate superheated steam to operate the turbo-generator • (B) evaporate circulating boiler water into saturated steam o (C) condense excess steam produced in the boiler o (D) maintain a water level in the steam drum


23. Poor combustion in a diesel engine can be caused by __________.

o (A) high scavenge air pressure o (B) low exhaust pressure • (C) low compression temperature o (D) high compression pressure


24. The indicated position of the fuel injection pump plunger as shown in the illustration, will provide fuel delivery to the diesel engine in an amount approximately equal to __________. Illustration MO-0061

o (A) normal fuel flow • (B) maximum fuel flow o (C) zero fuel flow o (D) light fuel flow



8/30/2017

U.S.C.G. Merchant Marine Exam First Assistant Engineer Q514 Motor Plants Illustrations: 13 25. Regarding the fuel injector shown in the illustration, the purpose of piece #38 is to __________.

Illustration MO-0059

• (A) filter the fuel o (B) adjust the fuel rack spring tension o (C) maintain fuel pressure at a preset level o (D) relieve excess fuel pressure to the suction side of the pump


26. When entering a ECA, when should you begin the changeover to low sulphur fuel on a slow-speed diesel vessel?

o (A) At Arrival. o (B) An hour before crossing the demarcation line for low sulphur fuel. • (C) In sufficient time to ensure the engine is burning a fuel mixture of sufficiently low sulphur to

meet the regulatory requirement. o (D) When the vessel crosses the demarcation line.


27. High-speed, multi-cylinder, diesel engines commonly use counterweights placed opposite to the crankpins to __________.

o (A) prevent bearing loads • (B) provide dynamic balance by equalizing centrifugal force o (C) counteract inertia forces o (D) provide a balance of rocking couples around the crankshaft


28. Which of the operating positions, for valve "A" shown in the illustration, should be chosen to maintain the circuit in continuous flow, regardless of failure to the included downstream components? Illustration MO-0115

o (A) I • (B) II o (C) III o (D) IV



8/30/2017

U.S.C.G. Merchant Marine Exam First Assistant Engineer Q514 Motor Plants Illustrations: 13 29. Which of the conditions listed could cause the cylinder relief valves on a large, low-speed, propulsion

diesel engine to lift?

o (A) Plugged injector nozzles • (B) Excessive fuel injection o (C) Incorrect crankshaft clearances o (D) Very late injection timing


30. During unsafe firing conditions in a large automatic auxiliary boiler, various control actuators are interlocked with the burner circuit to prevent start-up, in addition to safety shutdown. These controls are referred to as __________.

• (A) limit controls o (B) flame safeguard controls o (C) combustion controls o (D) programming controls


31. You are on a slow-speed diesel engine vessel equipped with an ALCAP fuel oil purification system. You notice an increase in the water drained from the service tank bottom drain. One of the first items to check on your system would be which of the following?

o (A) The closing water solenoid valve in the fresh water line. o (B) The water transducer located in the dirty oil supply line. o (C) The bowl RPM. • (D) The water transducer located in the clean oil discharge line.


32. Which of the following procedures should be carried out to permit the continued operation of a crosshead engine with a leaky aftercooler?

o (A) Bypass the aftercooler to operate at sea speed. o (B) Switch to diesel fuel and run at reduced speed. o (C) Nothing needs to be done due to the low heating value of heavy fuel. • (D) Blank off the cooling water lines and run at reduced speed.



8/30/2017

U.S.C.G. Merchant Marine Exam First Assistant Engineer Q514 Motor Plants Illustrations: 13 33. In accordance with 46 CFR Subchapter F, diesel fuel oil system valves for removing water or

impurities are __________.

• (A) permitted, provided they are fitted with caps or plugs o (B) required, if there are no separators installed on board o (C) not required, provided there is a high and low tank suction o (D) strictly prohibited


34. The gage glass on a coil-type auxiliary boiler is connected to the __________.

• (A) accumulator o (B) surge chamber o (C) heating coil inlet and outlet o (D) water softener


35. Trunk type diesel engine pistons are effectively cooled when heat is __________.

o (A) radiated through the engine block • (B) transferred to water cooled cylinder walls o (C) conducted through the piston crown o (D) transferred to escaping exhaust gases


36. Which of the following statements is accurate concerning the vibration sensing device used with the separator shown in the illustration? Illustration MO-0127

o (A) The vibration switch is sensitive to vibration in a direction horizontal to its mounting base and is normally installed low on the separator where movement is magnified.

o (B) Vibration sensors are not used with centrifuges currently installed on diesel vessels due to excessive vibrations developed by the main propulsion units.

o (C) The detector is so arranged to prevent abnormal harmonic frequencies from being developed while the separator is passing through its critical speed range.

• (D) The detector mechanism consists of an armature suspended on a flexure pivot and restrained from motion by a permanent magnet acting through a small air gap.



8/30/2017

U.S.C.G. Merchant Marine Exam First Assistant Engineer Q514 Motor Plants Illustrations: 13 37. A diesel engine operates erratically, overspeeds, and fails to restart when cranked at normal speed.

Which of the following problems is the most likely cause for the engine failing to restart?

o (A) Failure to reposition the fuel rack o (B) Improper governor operation due to excess oil pressure • (C) Failure to reset the overspeed trip o (D) Damage to the governor due to excessive speed


38. Governor hunting is caused by __________.

• (A) governor over-control o (B) excessive speed droop o (C) insufficient speed droop o (D) governor under-control


39. Which of the following is one of the ways to prevent a scavenging fire on a slow-speed diesel engine?

o (A) Prevent air from entering the scavenging space. • (B) Keep the scavenging space clean and free of oil. o (C) Shut down the engine if the crankcase mist detector alarm sounds. o (D) Monitor the main bearing temperatures.


40. Crankcase explosions in propulsion diesel engines result from __________.

• (A) the ignition of unburned fuel and air in the crankcase o (B) the dilution of crankcase oil with particles of combustion o (C) the splashing of lubrication oil by the crankshaft o (D) broken fuel lines spraying oil on the crankcase


41. Bouncing of the valve gear in a diesel engine can be caused by __________.

o (A) prolonged high-speed operation • (B) spring surge o (C) worn valve seats o (D) excessively tightened spring retainers



8/30/2017

U.S.C.G. Merchant Marine Exam First Assistant Engineer Q514 Motor Plants Illustrations: 13 42. Downcomers installed on auxiliary package boilers are protected from direct contact with hot gases

by __________.

o (A) steel baffles • (B) refractory and insulation o (C) waterwall tubes o (D) several rows of screen tubes


43. The circuit shown in the illustration represents a/an __________. Illustration MO-0115

o (A) infinitely positioned pneumatic control • (B) detented, control air pressure, reducing and filtering unit o (C) pneumatic actuated, multiple position, control unit o (D) hydraulic actuated, multi-position control unit


44. A feed pump for an auxiliary boiler might lose suction if the __________.

o (A) boiler water level is low • (B) feedwater is too hot o (C) boiler steam demand is low o (D) feedwater is too cold


45. Which of the following statements describes how the fuel oil enters the whirling chambers of the sprayer plates used in an auxiliary boiler return flow fuel oil system?

o (A) Through the outer barrel tube. o (B) Through the sprayer plate drilled passages. • (C) Through tangential slots in the sprayer plate. o (D) Through baffles in the orifice plate.


46. Large, two-stroke cycle, main propulsion, diesel engine cylinders can be successfully pressure charged during normal operation, by using the __________.

• (A) constant or pulse pressure system o (B) constant volume system o (C) exhaust load system o (D) exhaust gas temperature system



8/30/2017

U.S.C.G. Merchant Marine Exam First Assistant Engineer Q514 Motor Plants Illustrations: 13 47. The direct acting mechanical governor used with some small diesel engines, controls fuel flow to the

engine by __________.

o (A) positioning a servomotor piston attached to the fuel controls o (B) governor flyweight action on a pilot valve which controls fuel injection • (C) governor flyweight motion acting on fuel controls through suitable linkage o (D) positioning a butterfly valve in the fuel delivery system


48. The component identified as item #15 is used to __________. Illustration MO-0016

o (A) test injector popping pressure o (B) advance fuel pump timing • (C) stop fuel delivery to the injector o (D) increase the fuel pump delivery pressure


49. If the bowl of a disk-type centrifugal purifier when operated as a separator is not primed, the __________.

o (A) purifier will act as a clarifier at the discharge ring o (B) oil solids will be deposited only at the intermediate top disk • (C) oil will be lost through the water discharge ports o (D) oil has a tendency to emulsify in the bowl


50. Telescopic pipes which are attached to water cooled pistons of large, slow-speed, main propulsion diesel engines are designed to ________.

o (A) overcome excessive crankcase pressure o (B) prevent excessive lube oil temperature • (C) allow piston cooling water to efficiently enter the piston despite its reciprocating piston motion

without contaminating the engine lube oil o (D) prevent contamination of the cylinder cooling water with engine lube oil


51. As an engineer of a slow-speed diesel powered vessel, you note that the indicator card diagrams have a flat horizontal profile around TDC. To rectify this, what would be your best course of action?

• (A) Use a spring with a higher spring constant (k value) in the indicator. o (B) Reduce the RPM at which the readings are taken. o (C) Use a spring with a lower spring constant (k value) in the indicator. o (D) Increase the RPM at which the readings are taken.



8/30/2017

U.S.C.G. Merchant Marine Exam First Assistant Engineer Q514 Motor Plants Illustrations: 13 52. A large change in ambient temperature, or using an oil of a viscosity different than the one

recommended by the manufacturer in a mechanical hydraulic governor, will result in the need to adjust the __________.

o (A) accumulator spring tension • (B) compensating needle valve o (C) pilot valve opening o (D) compensating spring tension


53. When tightening the lock ring "G" of the device shown in the illustration, two events are simultaneously accomplished. Which of the following statements represents these events? Illustration MO-0112

o (A) The lock ring insures proper contact between the bowl top and the sliding bowl bottom, in addition to compressing the disc stack.

o (B) The lock ring forces the disc stack onto the spindle, providing a positive means of rotation and locating the bowl top to seal the separation chamber.

• (C) When tightened, the lock ring allows for movement of the sliding piston and positions the sliding piston within the bowl bottom.

o (D) The lock ring insures proper positioning of the disc stack and maintains a positive contact of the bowl top and bowl bottom.


54. After stopping a diesel engine with a high main bearing temperature, what is the time one needs to wait before a diesel engine crankcase can be opened?

o (A) Not less than 15 minutes. • (B) Not less than 30 minutes. o (C) Not less than 60 minutes. o (D) Not less than 120 minutes.


55. The lower end of the piston rod, shown in the illustration, is fitted into the __________. Illustration MO-0003

o (A) crank pin • (B) crosshead o (C) piston pin o (D) crosshead guide



8/30/2017

U.S.C.G. Merchant Marine Exam First Assistant Engineer Q514 Motor Plants Illustrations: 13 56. Evidence of low temperature corrosion is observed on the combustion space components of a slow-

speed diesel engine. What causes this corrosion and what can one do to mitigate this situation?

• (A) Sulfur from the fuel condensing on cold surfaces forming sulfuric acid. Ensure cooling water temperatures maintain the combustion space temperatures above the dew point of sulfuric acid.

o (B) Low temperature corrosion cannot be observed; it has to be determined by metallurgical testing. Maintain cooling water temperatures as per manufacturer's specifications.

o (C) Vanadium from fuel melting in the exhaust gases. Maintain lower cooling water temperature to prevent vanadium from melting.

o (D) Sulfur in exhaust gas mixing with water vapor condensation. Order cylinder oil of lower total base number.


57. Casing drains may be required on a waste heat boiler gas passage side to __________.

o (A) prevent an accumulation of boiler water entering gas passages as a result of a pinhole tube leak

o (B) as a means to sample stack gases for testing o (C) release excess pressure • (D) drain off condensation


58. The rate of pressure rise during the period following fuel ignition in a diesel engine is influenced by the length of the ignition delay period and the __________.

o (A) volumetric efficiency • (B) turbulence of the air charge o (C) fuel efficiency o (D) valve overlap


59. As the load is being decreased on the engine controlled by the governor shown in the illustration, the __________. Illustration MO-0092

o (A) pilot valve plunger will move down • (B) right hand end of the floating lever will move up o (C) oil pressure under the power piston will increase o (D) speeder rod will move down



8/30/2017

U.S.C.G. Merchant Marine Exam First Assistant Engineer Q514 Motor Plants Illustrations: 13 60. The device shown in the illustration is used to secure the air supply to a diesel engine when the

engine overspeeds. In order for this to occur, supplied oil pressure must __________. Illustration MO-0103

o (A) move the piston rod to the left o (B) move the piston rod to the right • (C) decrease allowing the spring to move the piston rod to the right o (D) decrease allowing the butterfly valve to turn counter-clockwise


61. Which of the following types of feedwater regulators is commonly used with a water-tube, natural circulation, auxiliary boiler?

• (A) Thermo mechanical o (B) Bimetallic element o (C) Ring thermostat o (D) Modulating pressuretrol


62. Which of the following conditions is indicated by the presence of water in the scavenging air receiver?

o (A) Excessively high scavenge air temperature • (B) Leaking aftercooler o (C) Leaking cylinder head gaskets o (D) Auxiliary blower failure


63. Ring groove inserts are occasionally used on aluminum alloy pistons to __________.

• (A) reduce the ring groove wear rate o (B) seal against crankcase vapors o (C) lessen the wear on aluminum parts of the cylinder o (D) allow for the greater expansion rate of aluminum


64. What will cause valve stem blow-by to the valve section shown in the illustration? Illustration MO-0030

o (A) A cracked lower spring plate. o (B) Worn, broken or stuck compression rings. o (C) Damaged rubber rings on the valve seat insert. • (D) Defective rubber seal rings in the valve guides.



8/30/2017

U.S.C.G. Merchant Marine Exam First Assistant Engineer Q514 Motor Plants Illustrations: 13 65. Which type of diesel engine fuel nozzle is shown in the illustration? Illustration MO-0059

o (A) Open o (B) Pintle o (C) Self-cleaning • (D) Multi-hole


66. Oil accumulating in the exhaust piping or manifold of a diesel engine can be caused by __________.

o (A) collapsed hydraulic valve lifters • (B) worn valve guides o (C) excessive crankcase vacuum o (D) excessive lube oil pressure


67. Heat damage to fuel injection nozzles can be prevented by avoiding __________.

• (A) long periods of engine overload o (B) metallic contact between nozzles and cylinder heads o (C) hard carbon deposit and varnish on the nozzles o (D) excessive fuel oil temperature


68. One remedy for a high firing pressure, in addition to a high exhaust temperature in one cylinder of a diesel engine, is to __________.

• (A) adjust the fuel rack o (B) retard fuel injector timing o (C) reduce fuel booster pump pressure o (D) increase scavenge air pressure


69. The illustration shown describes a _______. Illustration MO-0069

o (A) four-cycle opposed cylinder diesel engine o (B) four-cycle opposed-piston diesel engine o (C) two-cycle opposed cylinder diesel engine • (D) two-cycle opposed-piston diesel engine



8/30/2017

U.S.C.G. Merchant Marine Exam First Assistant Engineer Q514 Motor Plants Illustrations: 13 70. Which of the following problems is the main source of fuel pump and injection system malfunctions?

o (A) Coated fuel lines o (B) Improper lubrication • (C) Air in the fuel system o (D) Excessive vibration



8/30/2017


6/3/2016

MO-0003

Adapted for testing purposes only from ROWEN, Introduction to

Practical Marine Engineering, Volume 2

Copyright © 2005 The Society of Naval Architects and Marine Engineers

Further reproduction prohibited without permission. of 30 Q514 Motor Plants


2/25/2015

MO-0016

Adapted for testing purposes only from Description of and Operating Instructions

for Sulzer Diesel Engines RND-M. © Sulzer Brothers Limited.

Further reproduction prohibited without permission.

1

2

3

4

5

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MO-0030

Adapted for testing purposes only from Rowen, Gardner, Femenia, Chapman and

Wiggins, Introduction to Practical Marine Engineering, Vol.2. © 2005 The Society

of Naval Architects and Marine Engineers.

Further reproduction prohibited without permission. of 30

Q514 Motor Plants


4/21/2015

MO-0059

Adapted for testing purposes only from EMD 645E9 Turbocharged Engine Maintenance

Manual. Copyright © 1973 Electro-Motive Division, General Motors. Further

reproduction prohibited without permission.

38

37

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29

33

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7/23/2015

MO-0061

Adapted for testing purposes only from KATES/LUCK, Diesel and High Compression

Gas Engines, 3rd

edition

Copyright © 1974 by American Technical Society



8/28/2015

MO-0069

Adapted for testing purposes only from ROWEN, Introduction to Practical Marine

Engineering, Volume 2: Figures

Copyright © 2005 The Society of Naval Architects and Marine Engineers

Further reproduction prohibited without permission.



8/31/2016

MO-0103

Adapted for testing purposes only



9/12/2016

MO-0112

Adapted for testing purposes only from Instruction Manual and Parts List,

Mineral Oil Separator with Self-Cleaning Bowl, Model OSA 20-02-066

Copyright © Westfalia Separator



9/13/2016

MO-0113

Adapted for testing purposes only from Instruction Manual and Parts List,

Mineral Oil Separator with Self-Cleaning Bowl, Model OSA 20-02-066

Copyright © Westfalia Separator



9/20/2016

MO-0115

Adapted for testing purposes only from SULZER, Description of and

Operating Instructions for Sulzer Diesel Engines RND-M

Copyright © Sulzer Brothers Limited.



10/20/2016

MO-0127

Adapted for testing purposes only from KNAK, Diesel Motor

Ships Engines and Machinery, Drawings

Copyright © 1979 by Christen Knak



10/20/2016

MO-0128

Adapted for testing purposes only

Further reproduction prohibited without permission of 30 Q514 Motor Plants

U.S.C.G. Merchant Marine Exam First Assistant … disassembling or assembling an injection pump...

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