Propulsion of the vast majority of contemporary merchant ships (especially containerships and VLCCs) utilizes（） as prime mover.

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• Loss of lubricating oil pressure to the main propulsion diesel engine will actuate a/an （）.

  A . overspeed trip B . audible/visual alarm C . the ships/boats general alarm D . reserve oil storage tank

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• During maneuvering operations for a direct reversing large, low-speed, main propulsion diesel engine, which of the following actions is used to stop the shaft from turning prior to reversing the engine rotation?（）

  A . Flywheel inertia B . Admission of starting air C . The way of the vessel D . securing of fuel to the cylinder

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• The word “critical” in the sentence “This is a critical period as any loss of propulsion, or steering, can lead to collision, grounding, or other damage to the ship” can be best replaced by （）.

  A . A.dangerous B . B.best C . C.bad D . D.important

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• A water jacket is placed around the exhaust manifolds of propulsion diesel engines to（）

  A . reduce heat radiation to the engine room B . aid in preventing turbocharger overheating C . condense and drain moisture from exhaust gases D . dampen exhaust gas pulsations in the manifold

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• In a main propulsion turbocharged diesel engine, the speed of the turbocharger varies according to the （）

  A . governor droop B . speeder spring tension C . fuel rack lag D . load on the engine

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• The opening of an exhaust valve on a modem, large, low-speed, main propulsion diesel engine may be actuated by （）.

  A . direct action of cam shaft B . compressed air pressure C . hydraulic “push rods” D . direct action of the main piston moving dow

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• The four-stroke engine is used for （） and sometimes for main propulsion with a gearbox to provide a propeller speed of between 90 to 120 rev/min.

  A . alternator B . turbo-charger C . remote controller D . windla

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• Which of the following statements concerning the lubrication of diesel propulsion engines used in vessels over 300 gross tons is most accurate?（）

  A . Lubrication systems using engine driven lube oil pumps do not require any additional independent arrangement when such arrangements have been proven reliable B . The use of engine driven pre-lube pumps is permitted on vessels with propulsion systems developing less than 500 shaft horsepower C . When forced lubrication is used for propulsion engines, one independently driven stand-by pumps is to be provided in addition to the necessary pumps for normal operation D . Lubrication systems where two oil coolers are fitted require a minimum of two temperature control devices which may be actuated by similar sensor

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• Mist detectors used on large low-speed main propulsion diesel engines monitor and check for the presence of （）.

  A . fuel oil vapor at the sludge tank vent B . unburned fuel vapors in the scavenge air receiver C . lube oil vapors in the crank case D . lube oil vapors in the engine room

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• Which of the following problems can cause fluctuating pressures in the closed cooling system of a main propulsion diesel engine?（）

  A . Defective temperature controls in the system B . Cavitation in the cooling water pump C . Opened vent in the cooling system D . Restricted water passages in the engine

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• Prior to starting most medium-speed propulsion diesel engines, which of the procedures listed should be observed?（）

  A . The expansion tank should be topped off B . The thermostatic water regulating valves should be manually opened C . The fuel filters should be changed D . The engine should be turned over slowly with the indicator cocks ope

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• Propulsion engines and the vast majority of auxiliary generator engines are designed to allow a generous through-flow of scavenge air in order to control （）

  A . the lubricating oil consumption B . the turbine blade temperature C . the flow rate of fuel D . scavenge air pressure

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• Which of the listed types of starting systems is often used on large, low-speed, direct reversing, main propulsion diesel engines?（）

  A . Electric B . Hydraulic C . Air D . All of the above

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• While underway, which of the following would be the FIRST step in reversing a direct reversing large, low-speed, main propulsion, diesel engine?（）

  A . Manually trip the over-speed device B . Interrupt the fuel flow to the engine C . Disengage the safety interlock D . Slide the camshaft to the neutral positio

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• Changes in direction or speed of the main propulsion units shall be recorded, （）an Administration has determined that the size or characteristics of a particular ship make such recording impracticable.

  A . in addition to B . in addition that C . except for D . except where

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• Critical speeds occurring within the operating speed range of a main propulsion diesel engine may be changed, or have their damaging effects reduced by a/an （）

  A . engine support vibration isolator B . detuner or viscous fluid damper C . lightened crankshaft flywheel D . spherically seated crankshaft bearing

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• Thermocouple pyrometers are used on large, main propulsion diesel engines to indicate the temperature of the（）

  A . cooling water leaving each cylinder B . fuel oil entering the injector C . exhaust gases at various locations D . lube oil at the bearing supplie

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• The main propulsion diesel engine jacket water temperature rises above normal, with the raw water sea suction and the expansion tank water level being normalWhich of the following problems is most likely the cause?（）

  A . Faulty thermostatic bypass valve B . Eroded zinc pencils in the heat exchanger C . Steam formation in the expansion tank D . Excessive leakage from jacket water pump seal

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