U.S.C.G. Merchant Marine Exam UFIV-Assistant Engineer Q690 … · 2020. 9. 3. · o (D) Not enough information is given to determine camshaft rpm. If choice B is selected set score

National Maritime Center Serving Our Nation’s Mariners

U.S.C.G. Merchant Marine Exam

UFIV-Assistant Engineer

Q690 Motor Plants

(Sample Examination)

Page 1 of 39 Q690 Motor Plants

8/25/2020

Q690 Motor Plants U.S.C.G. Merchant Marine Exam UFIV-Assistant Engineer Illustrations: 23

Choose the best answer to the following Multiple Choice Questions

1. What statement concerning fuel cetane rating and the ignition delay period is true as it applies to uninspected fishing industry trawler and seiner main propulsion diesel engines?

o (A) The ignition delay period is the lag in time between when fuel injection is initiated and when fuel injection actually begins, and the higher the cetane rating of the fuel the longer the ignition delay period.

o (B) The ignition delay period is the lag in time between when fuel injection actually begins and when combustion actually begins, and the higher the cetane rating of the fuel the longer the ignition delay period.

• (C) The ignition delay period is the lag in time between when fuel injection actually begins and when combustion actually begins, and the higher the cetane rating of the fuel the shorter the ignition delay period.

o (D) The ignition delay period is the lag in time between when fuel injection is initiated and when fuel injection actually begins, and the higher the cetane rating of the fuel the shorter the ignition delay period.

If choice C is selected set score to 1.

2. You are assigned to a fishing industry factory ship fitted with main propulsion diesel engines of the type shown in the illustration. If the engine's crankshaft is turning at 900 rpm, what will be the rotational speed of the two camshafts? Illustration MO-0122

o (A) 450 rpm • (B) 900 rpm o (C) 1800 rpm o (D) Not enough information is given to determine camshaft rpm.

If choice B is selected set score to 1.

3. You are assigned to a fishing factory ship fitted with main propulsion diesel engines of the type shown in the illustration. If the engine's crankshaft is turning at 720 rpm, what will be the rotational speed of the two camshafts? Illustration MO-0005

• (A) 360 rpm o (B) 720 rpm o (C) 1440 rpm o (D) Not enough information is given to determine camshaft rpm.

If choice A is selected set score to 1.


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4. The uninspected fishing trawler to which you are assigned is fitted with main propulsion diesel engines of the type shown in the illustration. In terms of valve operating gear, cylinder liner type, and connecting rod type, what statement is true? Illustration MO-0005

• (A) This is a pushrod operated overhead valve engine, with wet cylinder liners and conventional connecting rods.

o (B) This is a pushrod operated overhead valve engine, with jacketed cylinder liners and articulated connecting rods.

o (C) This is an overhead cam engine, with wet cylinder liners and conventional connecting rods. o (D) This is an overhead cam engine, with jacketed cylinder liners and marine-type connecting

rods.


5. When checking the cylinder jacket water cooling expansion tank level on a main propulsion diesel engine on your fishing factory ship while underway, what should be the expansion tank level?

• (A) The level should be in the upper part of the sight glass when the engine is at operating temperature.

o (B) The actual level is unimportant as long as it is visible in the sight glass when the engine is at operating temperature.

o (C) The level should be out of sight high in the sight glass when the engine is at operating temperature.

o (D) The level should be in the lower part of the sight glass when the engine is at operating temperature.


6. You are assigned as an engineer on an uninspected fishing trawler using main propulsion engines of the type shown in the illustration. What statement represents the procedure for inspection of the lower cylinder liner bore while in place inside the engine? Illustration MO-0122

o (A) With the particular piston positioned at BDC and the corresponding air box handhole cover removed, inspect the lower liner bore through the crankcase opening.

• (B) With the particular piston positioned at TDC and the corresponding oil pan handhole cover removed, inspect the lower liner bore through the crankcase opening.

o (C) With the particular piston positioned at TDC and the corresponding air box handhole cover removed, inspect the lower liner bore through the crankcase opening.

o (D) With the particular piston positioned at BDC and the corresponding oil pan handhole cover removed, inspect the lower liner bore through the crankcase opening.



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7. The mollusc dredger to which you are assigned is fitted with generator set drive engines as shown in the illustration. What statement is true in terms of the combustion chamber design? Illustration MO-0006

o (A) The engine uses pre-combustion chambers with a flat fire-deck. o (B) The engine uses turbulence chambers with a hemispherical fire-deck. • (C) The engine uses an open type combustion chamber with a flat fire-deck. o (D) The engine uses an open type combustion chamber with a hemispherical fire-deck.


8. The uninspected fishing trawler to which you are assigned is fitted with auxiliary engines as partly shown in the illustration. What statement is true concerning the valve guide and valve seat arrangements? Illustration MO-0013

o (A) The valve guides are integral (non-replaceable), and the valve seats are replaceable inserts. • (B) The valve guides and the valve seats are both replaceable inserts. o (C) The valve guides are replaceable inserts, and the valve seats are integral (non-replaceable). o (D) The valve guides and the valve seats are both integral (non-replaceable).


9. Prior to starting a diesel generator set engine fitted on your fishery research vessel, it has been determined that the transfer of make-up oil is required. At what checked level should you stop adding make-up oil?

o (A) When the oil level rises to the ADD mark on the dipstick. o (B) When the oil level rises to a level well above the FULL mark on the dipstick. • (C) When the oil level rises to the FULL mark on the dipstick. o (D) When the oil level rises to the between the ADD and FULL marks on the dipstick.


10. When checking the valve stem to rocker arm clearances on an auxiliary diesel engine onboard your fishery research vessel, which of the following statements concerning intake and exhaust clearances when taken cold is correct?

o (A) When taken cold, a properly adjusted exhaust valve clearance could be less than or greater than the intake valve clearance.

o (B) When taken cold, a properly adjusted exhaust valve clearance would definitely be less than the intake valve clearance.

o (C) When taken cold, a properly adjusted exhaust valve clearance would definitely be equal to the intake valve clearance.

• (D) When taken cold, a properly adjusted exhaust valve clearance would definitely be greater than the intake valve clearance.

If choice D is selected set score to 1.


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Q690 Motor Plants U.S.C.G. Merchant Marine Exam UFIV-Assistant Engineer Illustrations: 23 11. The various auxiliary diesel engines fitted on your uninspected fishing trawler may employ a variety

of different cranking methods for engine starting. What type of cranking method is shown in the illustration? Illustration MO-0044

o (A) Electric cranking motor. o (B) Hydraulic cranking motor. o (C) Gasoline engine cranking motor. • (D) Air cranking motor.


12. The various auxiliary diesel engines fitted on your fishery research vessel may employ a variety of different starting systems. What type of starting system is shown in the illustration? Illustration MO-0049

• (A) Hydraulic power operated system. o (B) Gas engine power operated system. o (C) Pneumatic power operated system. o (D) Electric power operated system.


13. The main propulsion diesel engines on the fishery research vessel to which you are assigned are started with vane-type air-starting motors. At a minimum, in the absence of automatic drain valves, how often should the starting air receivers be drained of moisture while the vessel is underway?

o (A) Hourly • (B) Daily o (C) Weekly o (D) Monthly


14. The main propulsion engines onboard your fishery research vessel use a lubricating oil system as shown in the illustration. Under what circumstances will the turbo soak-back pump operate? Illustration MO-0186

o (A) It will operate at all times while the engine is running. • (B) It will run for period of time before engine start-up and after engine shutdown. o (C) It will run for a period of time after engine shutdown only. o (D) It will run for a period of time prior to engine start-up only.



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15. The diesel generator engines onboard your mollusc dredger use a lubricating oil filtration scheme as shown in the illustration. What type of filtration system is illustrated? Illustration MO-0181

o (A) Sump filtration o (B) Bypass filtration • (C) Full-flow filtration o (D) Shunt filtration


16. A diesel generator set on your fishing industry factory ship has a simplex lube oil strainer of the type shown in the illustration, situated on the discharge side of the lube oil pump. At a specified engine rpm and lube oil temperature, you notice that the inlet pressure is increasing and the outlet pressure is decreasing, resulting in an unacceptable pressure drop. What should be done? Illustration MO-0057

• (A) While the engine is running, the cleaning handle (A) should be rotated one or more full turns to remove the accumulated dirt from the disk stack (C).

o (B) While the engine is running, the drain plug (B) should be carefully loosened to drain the sludge from the strainer sump.

o (C) The drain plug (B) is removed to drain the sludge from the strainer sump, but the engine must be stopped to perform this operation.

o (D) While the engine is running, the cleaning handle (A) should be rotated one-half turn to remove the accumulated dirt from the disk stack (C).


17. Which of the following fuel systems is characterized by a complete absence of high-pressure fuel lines?

o (A) In-line multi-plunger type system. o (B) Common rail type system. • (C) Unit injector type system. o (D) Rotary plunger type system.



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18. The main engines on the fishing factory ship to which you are assigned are fitted with duplex secondary spin-on fuel filters. Concerning the selector handle, what statement is true?

o (A) The selector handle is normally placed in the "BOTH" position regardless of the load or rpm on the engine in order to be able to double the fuel handling throughput at any load or rpm and allow the engine speed to be changed without worrying about the selector handle position.

o (B) The selector handle is placed in the "BOTH" position when the engine is running at high load or rpm to accommodate higher fuel delivery requirements. When the engine is running at low load or rpm, the selector handle is placed in either the "1" or "2" position.

• (C) The selector handle is placed in either position the "1" or "2" position regardless of the load or rpm on the engine. The selector handle is temporarily placed in the "BOTH" position only when transitioning from a restricted filter element over to a clean filter element.

o (D) The selector handle is placed in the "BOTH" position when the engine is running at low load or rpm. When the engine is running at high load or rpm, the selector handle is placed in either the "1" or "2" position depending upon which filter element is clean.


19. The manufacturer of the diesel generator set drive engines used aboard your fishing trawler recommends that no more than a 2 psig pressure drop across a fuel primary metal-edge suction strainer be allowed before recommended servicing. Assuming that the strainer inlet pressure is 4 psig, what would be the minimum allowable outlet pressure before recommended servicing?

• (A) 2 psig o (B) 2" Hg o (C) 6 psig o (D) 6" Hg


20. The uninspected fishing trawler to which you are assigned has diesel generators fitted with unit injectors with the operating principle as shown in the illustration. What statement is true concerning the beginning and ending of injection? Illustration MO-0144

o (A) Injection begins when the lower fuel port is covered by the lower helix of the upward moving plunger, and injection ends when the upper fuel port is uncovered by the upper helix of the upward moving plunger.

o (B) Injection begins when the upper fuel port is covered by the upper helix of the upward moving plunger, and injection ends when the lower fuel port is uncovered by the lower helix of the upward moving plunger.

o (C) Injection begins when the lower fuel port is covered by the lower helix of the downward moving plunger, and injection ends when the upper fuel port is uncovered by the upper helix of the downward moving plunger.

• (D) Injection begins when the upper fuel port is covered by the upper helix of the downward moving plunger, and injection ends when the lower fuel port is uncovered by the lower helix of the downward moving plunger.



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Q690 Motor Plants U.S.C.G. Merchant Marine Exam UFIV-Assistant Engineer Illustrations: 23 21. On diesel engines used on a fishing industry factory ship, which type of injection system is most

likely to use sophisticated electronic controls for timing and metering?

o (A) In-line multi-plunger pump o (B) Distributor type pump • (C) Unit injector type pump o (D) Rotary plunger type pump


22. The mollusc dredger to which you are assigned has diesel generators fitted with unit injectors of the type shown in the illustration. What statement is true concerning the operation of unit injectors of this type? Illustration MO-0143

o (A) Pressurization of the fuel is accomplished by the electronically controlled solenoid, and the timing and metering of the fuel is accomplished by the mechanically operated rocker arm.

o (B) Pressurization and timing of the fuel is accomplished by the mechanically operated rocker arm, and the metering of the fuel is accomplished by the electronically controlled solenoid.

o (C) Pressurization and metering of the fuel is accomplished by the mechanically operated rocker arm, and the timing of the fuel is accomplished by the electronically controlled solenoid.

• (D) Pressurization of the fuel is accomplished by the mechanically operated rocker arm, and the timing and metering of the fuel is accomplished by the electronically controlled solenoid.


23. The main propulsion diesel engines on the fishery research vessel to which you are assigned are fitted with mechanically operated and controlled unit injectors. When are the sintered metal supply and return injector filters typically replaced?

o (A) Whenever the coalescing fuel filters are drained of sludge and moisture. • (B) Whenever the unit injectors are removed for reconditioning. o (C) Whenever the fuel system secondary filter elements are replaced. o (D) Whenever the fuel system primary suction strainer is cleaned.



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24. The diesel generator set drive engines on your fishing factory ship are protected with heavy-duty oil bath air cleaners. The oil within these air cleaners should be periodically replaced in accordance with manufacturer recommendations. What statement best describes when it would be appropriate to deviate from the recommended frequency?

o (A) Replace the oil more frequently when the engine is exposed to dusty conditions (such as arc welding in the engine room), and replace the oil less frequently when the oil is unusually dirty or when it thickens.

o (B) Replace the oil less frequently when the engine is exposed to dusty conditions (such as arc welding in the engine room), and replace the oil more frequently when the oil is unusually dirty or when it thickens.

• (C) Replace the oil more frequently when the engine is exposed to dusty conditions (such as arc welding in the engine room), and replace the oil more frequently when the oil is unusually dirty or when it thickens.

o (D) Replace the oil less frequently when the engine is exposed to dusty conditions (such as arc welding in the engine room), and replace the oil less frequently when the oil is unusually dirty or when it thickens.


25. The diesel engines on your fishing factory ship are all protected with dry-type air filters. When changing filter elements what visual indication would cause you to suspect that the engine has been contaminated with dust as the result of improperly sealing of the filter element gasket?

• (A) The "clean" side of the air filter element is streaked with dust. o (B) The "clean" side of the air filter element is clean and free of dust. o (C) The "dirty" side of the air filter housing is coated with dust. o (D) The "dirty" side of the air filter element is coated with dust.


26. The mollusc dredger to which you are assigned has diesel generator engines fitted with intake and exhaust systems as shown in the illustration. What type of turbo charging configuration is used? Illustration MO-0176

o (A) Constant pressure turbo charging. • (B) Pulse turbo charging. o (C) Boost-controlled turbo charging. o (D) 2-stage turbo charging.



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27. Assuming the use of ultra-low sulfur content diesel fuel, what combination of conditions associated with uninspected fishing industry vessel engine room operations would require the most frequent draining of exhaust systems of condensation?

o (A) Winter operations with lengthy ship escort transit times. o (B) Summer operations with lengthy ship escort transit times. o (C) Summer operations with prolonged idling on station. • (D) Winter operations with prolonged idling on station.


28. A main propulsion diesel engine on your fishing trawler produces gray to black smoke under virtually all load conditions as observed at the stack. The heavier the load on the engine, the darker the smoke becomes. What condition would most likely account for this?

o (A) Leaking exhaust manifold cooling water jackets. o (B) Leaking exhaust piping expansion joints. • (C) Excessively restricted exhaust silencer/muffler. o (D) Excessively worn exhaust valve guides.


29. The fresh water cooling systems serving the main engines of the fishery research vessel to which you are assigned are arranged as shown in the illustration. What statement best describes the arrangement of the fresh water keel cooler shown in the system diagram? Illustration MO-0138

o (A) The keel cooler is mounted on the inside of the hull below the water line. o (B) The keel cooler is mounted on the inside of the hull above the water line. o (C) The keel cooler is mounted on the outside of the hull above the water line. • (D) The keel cooler is mounted on the outside of the hull below the water line.


30. Your fishing factory ship is fitted with cooling water systems serving the main propulsion diesel engines as shown in the illustration. Which heat exchanger/cooler application and aspect would most likely require periodic mechanical cleaning with a specially designed brush? Illustration MO-0137

• (A) The inside of the tubes of the RW/FW heat exchanger. o (B) The inside of the tubes of the lube oil cooler. o (C) The outside of the tubes of the RW/FW heat exchanger. o (D) The outside of the tubes of the lube oil cooler.



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Q690 Motor Plants U.S.C.G. Merchant Marine Exam UFIV-Assistant Engineer Illustrations: 23 31. The fresh water cooling systems serving the main engines on your fishery research vessel are

arranged as shown in the illustration. If the fresh water thermostatic control valve fails in the position where 100% of the flow from flange "A" is permanently ported to flange "C" and flange "B" is permanently blocked, while starting and warming the engine with no load, what would be the resulting warm up time period? Illustration MO-0137

o (A) With no load, the engine would require a much shorter than normal time frame to warm up. • (B) With no load, the engine would require a much longer than normal time frame to warm up. o (C) With no load, it is not possible to describe the time frame required to warm up the engine. o (D) With no load, the engine would require a relatively normal time frame to warm up.


32. The diesel generators on the fishing industry seiner to which you are assigned are fitted with a charge air system as shown in the illustration. What statement is true concerning this type of charge air system? Illustration MO-0134

o (A) The scavenging blower is a non-positive displacement type, and the actual displacement is directly proportional to engine speed.

o (B) The scavenging blower is a positive displacement type, and the actual displacement is not directly proportional to engine speed.

• (C) The scavenging blower is a positive displacement type, and the actual displacement is directly proportional to engine speed.

o (D) The scavenging blower is a non-positive displacement type, and the actual displacement is not directly proportional to engine speed.


33. The two-stroke cycle main propulsion engines on the fishing trawler to which you are assigned are fitted with Roots-type blowers for scavenging purposes. Upon inspection of the air boxes, what condition would indicate a need to replace the Roots-type blower immediately?

• (A) Aluminum dust residue. o (B) Iron dust residue. o (C) Water accumulations. o (D) Oil accumulations.


34. A Roots-blown, two-stroke cycle main propulsion engine on the fishing factory ship to which you are assigned is emitting excessive bluish-tinged smoke from the stack. Further investigation reveals excessive lube oil consumption. What condition would most likely account for this?

o (A) Restricted scavenging air intake ports. o (B) Restricted blower air intake filter. • (C) Worn blower rotor shaft seals. o (D) Leaking fuel injector needle valve.



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Q690 Motor Plants U.S.C.G. Merchant Marine Exam UFIV-Assistant Engineer Illustrations: 23 35. The mollusc dredger to which you are assigned is fitted with reduction gears as shown in the

illustration. What statement is true concerning this type of reduction gear? Illustration MO-0085

o (A) The reduction gear is a single-input, double-reduction type of gear. • (B) The reduction gear is a single-input, single-reduction type of gear. o (C) The reduction gear is a double-input, double-reduction type of gear. o (D) The reduction gear is a double-input, single-reduction type of gear.


36. The lubricating oil system supporting the main propulsion reduction gear on the fishing trawler to which you are assigned is fitted with a sea water cooled 4-pass shell and tube lube oil cooler. The water box sacrificial zinc anodes must be inspected periodically. Which of the following listed actions correctly states maintenance criteria pertaining to scale build-up on the zincs?

o (A) Any accumulated scale build-up on sacrificial zinc anodes should be left intact to ensure proper protection from galvanic corrosion.

• (B) Any accumulated scale build-up on sacrificial zinc anodes should be scraped off until the zinc anodes are shiny.

o (C) Any sacrificial zinc anodes with accumulated scale build-up should be replaced regardless of the degree of deterioration.

o (D) There is no need to check for scale build-up on the sacrificial zinc anodes as this phenomenon is not physically possible.


37. The mollusc dredger to which you are assigned has a pneumatic propulsion control system as shown in the illustration. What statement is true concerning transfer of control? Illustration MO-0168

o (A) The transfer valve at the pilot house pneumatic master control station is used to transfer control of propulsion from the pilot house master control station to the mechanical slave remote control station or vice versa.

o (B) The transfer valve at the pilot house pneumatic master control station is used to transfer control of propulsion from the pilot house master control station to the engine room control station or vice versa.

• (C) The transfer valve at the engine room control station is used to transfer control of propulsion from the engine room control station to the pilot house pneumatic master control station or vice versa.

o (D) The transfer valve at the pneumatic remote-control station is used to transfer control of propulsion from the pneumatic remote-control station to the mechanical slave remote control station or vice versa.



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38. Diesel engine closed, recirculating cooling water systems are particularly prone to cavitation corrosion/erosion. Which of the listed cooling system/engine components has surfaces in contact with the coolant that are most susceptible to this type of corrosion and erosion?

o (A) Cylinder cooling water jackets. o (B) Engine exhaust cooling water jackets. o (C) Cylinder head cooling water passages. • (D) Wet-type cylinder liners.


39. The engine manufacturer for the main engines used on your mollusc dredger specifies a supplemental coolant additive consisting of molybdate and nitrite be used to supplement the heavy-duty antifreeze for the closed, recirculating fresh water cooling system. A test-strip comparison chart as shown in the illustration is used for coolant testing purposes. If the molybdate concentration color corresponds to row 2 and the nitrite concentration color corresponds to column B, what statement is true? Illustration MO-0211

• (A) The molybdate and nitrite concentrations levels are too low, and additional supplementary coolant additive is required.

o (B) The molybdate and nitrite concentrations levels are too high, and a portion of the coolant must be drained and replaced with fresh water.

o (C) The molybdate and nitrite concentrations levels are within acceptable limits, and no further correction is required.

o (D) It is not possible to determine the molybdate and nitrite concentration levels from the information given.


40. In a closed, recirculating fresh water cooling system used for the towing winch drive engine on your uninspected fishing seiner, what function would chemical treatment with pure ethylene glycol mixed with fresh water primarily perform?

o (A) Freezing point and boiling point elevation. o (B) Freezing point elevation and boiling point depression. o (C) Freezing point and boiling point depression. • (D) Freezing point depression and boiling point elevation.



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41. After performing repairs on the fuel injection system or governor of a main propulsion diesel engine on your fishing industry factory ship, what precaution should be taken prior to starting the engine?

o (A) Provisions should be made to shut off the engine's starting air supply to stop the engine in case there is an over speed on start-up.

• (B) Provisions should be made to shut off the engine's inlet air and/or fuel supply to stop the engine in case there is an over speed on start-up.

o (C) Provisions should be made to shut off the engine's lubricating oil supply to stop the engine in case there is an over speed on start-up.

o (D) Provisions should be made to shut off the engine's control electrical power supply to stop the engine in case there is an over speed on start-up.


42. While warming up the main engines on your uninspected fishing trawler while tied up at your own pier, one of the main engines suddenly sounds the low lube oil pressure alarm. What is the appropriate initial response?

o (A) Monitor closely oil pressures, temperatures, and levels while continuing to run the engine. o (B) Immediately add make-up oil or service lube oil coolers, strainers, and filters, as appropriate. • (C) Immediately shutdown the engine, then investigate the cause for the low-pressure alarm. o (D) Reduce the load and speed on the engine and continue to monitor the oil pressure.


43. The pneumatic propulsion control system used on your fishing factory ship uses a diaphragm-operated relay valve as shown in the illustration. Periodically, the valve is to be disassembled for cleaning and inspection. What statement best describes the proper technique? Illustration MO-0052

o (A) Rubber parts such as the diaphragm and metal parts such as the valve discs and seats should all be washed with soap and water.

o (B) Rubber parts such as the diaphragm should be cleaned with non-flammable solvent, and metal parts such as the valve discs and seats should be washed with soap and water.

• (C) Rubber parts such as the diaphragm should be washed with soap and water, and metal parts such as the valve discs and seats should be cleaned with non-flammable solvent.

o (D) Rubber parts such as the diaphragm and metal parts such as the valve discs and seats should all be cleaned with non-flammable solvent.



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44. The main engines on your uninspected fishing trawler are equipped with over speed trip devices as shown in the illustration. What statement concerning the operation of the over speed trip is true? Illustration MO-0171

o (A) The over speed trip senses centrifugal force proportional to engine speed and limits the engine speed to the rated speed, while allowing the engine to continue to run at the rated speed.

o (B) The over speed trip senses oil pressure proportional to engine speed and shuts the engine down at a pre-determined, specified maximum speed setting.

• (C) The over speed trip senses centrifugal force proportional to engine speed and shuts the engine down at a pre-determined, specified maximum speed setting.

o (D) The over speed trip senses oil pressure proportional to engine speed and limits the engine speed to the rated speed, while allowing the engine to continue to run at the rated speed.


45. The main engines on your fishing trawler are protected with a low crankcase oil level detector protective device designed to provide an alarm when the main sump oil level drops below a certain level. It is malfunctioning, and upon investigation you determine from the technical manual that the oil level detector is a sealed unit. What statement best represents the best strategy to remedy this situation?

o (A) The oil level detector seals must be broken before adjustments can be made, as long as new seals are established before placing the unit back into operation.

o (B) The oil level detector is adjusted just as if it was an unsealed unit, without regard to any seals associated with the unit.

• (C) The oil level detector must be replaced with a new detector if it is found to be defective, since field adjustments are not possible on this type of unit.

o (D) The oil level detector is adjusted just as if it was an unsealed unit, but the seals must be re-established before placing the unit back into operation.


46. The main engines on your fishing industry factory ship are fitted with speed control governors of the type shown in the illustration. What is the purpose of the compensation system, consisting of the buffer cylinder, buffer piston, buffer springs, and compensation needle valve? Illustration MO-0158

o (A) It senses the actual engine speed of rotation. • (B) It prevents engine hunting when responding to load changes. o (C) It senses the engine speed setting delivered from the bridge. o (D) It limits engine speed to a maximum value to prevent over speeding.



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47. Using the oil chart provided in the illustration for guidance, what would be the recommended straightweight petroleum oil to use in a main engine speed control governor on your fishery research vessel,if the governor is to remain in the acceptable operating range and the governor oil operatingtemperature may drop as low as 40oF? Illustration MO-0161

• (A) SAE 10o (B) SAE 20o (C) SAE 30o (D) SAE 40


48. The steam generating plant on your fishing industry factory ship is of the type shown in theillustration. Which of the labeled components would be the steam separator? Illustration MO-0196

o (A) 1o (B) 2o (C) 3• (D) 5


49. The auxiliary steam boiler on your fishing vessel is equipped with a gauge glass for local levelindication. On which of the following auxiliary boiler types would this gauge glass be attached to aflash chamber also known as a steam accumulator or steam separator?

o (A) Fire-tube steam boilero (B) Electric steam boiler• (C) Water-tube forced-circulation steam boilero (D) Water-tube natural-circulation steam boiler


50. What would be the most practical and efficient way of removing soot deposits from the fire-sides ofthe tubes of an auxiliary water-tube natural-circulation boiler as fitted on your fishing factory ship?

o (A) Use of a suitable acid.o (B) Use of a high-pressure water jet.o (C) Use of a power-driven wire brush.• (D) Use of an air lance.



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National Maritime Center

Serving Our Nation’s Mariners

10/17/2018

MO-0005

Adapted for testing purposes only from Wӓrtsilӓ 46 Instruction Manual

Copyright © Wӓrtsilӓ NSD Corporation.

Further reproduction prohibited without permission. Page 17 of 39 Q690 Motor Plants



10/17/2018

MO-0006

Adapted for testing purposes only from WILBU R, Pounder's Marine Diesel Engines, Sixth edition

Copyright © 1986 by Butterworth's Publishers

Further reproduction prohibited without permission Page 18 of 39 Q690 Motor Plants



10/17/2018

MO-0013

Adapted for testing purposes only from ALCO 251 Instruction Manual

Copyright © by ALCO

Further reproduction prohibited without permission Page 19 of 39 Q690 Motor Plants



10/18/2018

Adapted for testing purposes only from Replacement Parts Catalog No. 302,

Diesel Engines Model 645, 2nd Edition

Copyright © 1985 BY Electro-Motive Division, General Motors

Further reproduction prohibited without permission

MO-0044




10/18/2018

Adapted for testing purposes only from CATERPILLAR, Service Manual, D353 Industrial and Marine Engines

Copyright © Caterpillar


MO-0049




10/19/2018

Adapted for testing purposes only from WABTEC H5 Relayair Valve, Operation and Maintenance Instruction

Copyright © 2000 WABCO Locomotive Products.


MO-0052




10/19/2018

Adapted for testing purposes only from GUNTHER, Lubrication

Copyright © 1971 by Raymond C. Gunther


MO-0057




10/19/2018

Adapted for testing purposes only from Falk Marine Reduction Drives,

Installation, Operation and Maintenance Manual

Copyright © Falk


MO-0085




10/22/2018

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

Copyright © 1973 Electro-Motive Division, General Motors


MO-0122




10/24/2018

Adapted for testing purposes only from KATES/LUCK, Diesel and High Compression Gas Engines, 3rd edition

Copyright © 1974 by American Technical Society

Further reproduction prohibited without permission.

MO-0134




10/24/2018

Adapted for testing purposes only from Marine Propulsion Unit Operating Manual

Copyright © 1988 by Electro-Motive Division, General Motors Corporation


MO-0137 EMD Engine Fresh Water

Cooling System with Heat Exchanger




10/24/2018

Adapted for testing purposes only from Marine Propulsion Unit Operating Manual

Copyright © 1988 by Electro-Motive Division, General Motors Corporation


MO-0138 EMD Engine Fresh Water

Cooling System with Keel Cooler




10/25/2018

Adapted for testing purposes only from NORMAN Diesel Technology: Fundamentals, Service, Repair

Copyright © 2007 by the Goodheart-Wilcox Company, Inc.


MO-0143 Detroit Diesel 60 Series Engine

Unit Injector Arrangements




10/25/2018




MO-0144 Detroit Diesel 71 Series Engine Unit Injector



10/25/2018

Adapted for testing purposes only from PGA Marine Governor

Copyright © 1975 by Woodward Governor Company


MO-0158




10/25/2018

Adapted for testing purposes only from PGA Governor Installation and Operation Manual 36604 (Revision M)

Copyright © 1975 by Woodward


MO-0161 Oil Chart




10/25/2018

Adapted for testing purposes only from Falk Marine Reduction Drives,

Installation, Operation and Maintenance Manual

Copyright © 1976 Faulk


MO-0168 Pneumatic Propulsion Control System




10/25/2018

Adapted for testing purposes only from 645E7B Turbocharged Marine Engine/Systems, 1st Edition

Copyright © 1980 by Electro-Motive Division of General Motors


MO-0171 EMD 645 Overspeed and Manual Trips




10/25/2018




MO-0181 Simplified Lube Oil Filtration System



10/25/2018

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

Copyright © Electromotive Division, General Motors


MO-0186

EMD 645 Series Engine Lubricating Oil System


Documents

U.S.C.G. Merchant Marine Exam UFIV-Assistant Engineer Q690 … · 2020. 9. 3. · o (D) Not enough information is given to determine camshaft rpm. If choice B is selected set score