Auxiliary diesel engines can be automatically shut down as a result of （）

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• An auxiliary diesel engine may fail to start due to（）

  A . low exhaust back pressure B . high lube oil temperature C . insufficient cranking speed D . excessive fuel atomizatio

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• If the turbocharger failed on an auxiliary diesel engine, which of the following conditions would probably occur?（）

  A . Full power cannot be developed B . The exhaust will contain black smoke C . Complete combustion will be impossible D . All of the above

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• In an auxiliary diesel engine, the reason for knurling the piston skirt is to（）

  A . improve skirt lubrication B . allow for expansion C . transmit forces evenly D . improve the piston seal

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• If you were inspecting the valve springs on an auxiliary diesel engine, your best indication of impending spring failure would be （）

  A . a glazed surface on the spring B . nicks in the protective coating C . a build up of sludge deposits D . cracks in the surface of the spring

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• Fuel oil contamination of an auxiliary diesel engine lube oil can result in（）

  A . an increased flash point B . higher lube oil pressures C . an increased viscosity D . lower lube oil pressure

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• If you observe smoke coming from the turbocharger of an auxiliary diesel engine, you should（）

  A . check the air filter for obstruction B . check for an exhaust leak C . check the exhaust temperature D . secure the engine

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• A supercharged diesel engine when compared to a similar naturally aspirated diesel engine, will develop an increase in （）

  A . ignition lag B . engine horsepower C . lube oil system pressure D . specific fuel consumptio

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• An auxiliary reservoir for starting auxiliary engines should be kept at （）.

  A . low pressure at all times B . full pressure at all times C . low pressure at intermittence D . full pressure at intermittence

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• Starting air for auxiliary engines may be taken directly from the main reservoirs or through （）.

  A . an auxiliary reservoir B . a controlling air bottle C . an emergency air compressor D . a main air compressor

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• A two-stroke/cycle diesel engine requires less starting air than a four-stroke/cycle diesel engine, of equal displacement, because the two-stroke/cycle diesel engine（）

  A . has little or no internal friction B . has a lower effective compression ratio C . operates with scavenge air under a positive pressure D . operates without energy absorbing intake and exhaust stroke

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• When using a fuel with a higher than normal sulfur content in an auxiliary diesel engine, you should（）

  A . maintain higher than normal jacket water temperature B . change the lube oil more frequently than normal C . maintain a higher air-box temperature than normal D . maintain a higher air-box pressure than normal

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• Diesel engines are considered safer than gasoline engines because（）.

  A . they are more heavily built B . the fuel used is less volatile C . they can be easily reversed D . they operate at a lower speed

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• About the jacket water, that of the auxiliary engines usually（） is circulated by pumps, and the main engine usually （）

  A . an engine-driven；as well B . an engine-driven；has an independent pump C . an independent；as well D . an independent；has an engine-driven pum

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• Main engines as well as auxiliary engines operating on heavy fuel should have continuous on the lubricating oil, either according to the bypass or batch principles（）

  A . filtering B . centrifuging C . depositing D . operating

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• Worn main bearing will cause the compression ratio of an auxiliary diesel engine to（）

  A . increase B . decrease C . remain the same D . increase on compression decrease on expansio

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• Excessive valve lash in an auxiliary diesel engine will cause the valves to open（）

  A . later and close sooner B . sooner and close later C . sooner and close sooner D . later and close later

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• If an auxiliary diesel engine frequently stalls, the trouble may be caused by （）

  A . low exhaust back pressure B . air in the fuel system C . gasket blow-by or leakage D . incorrect assembly of idler spring

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• Critical speed in diesel engines occurs when engine torque pulsations become （）

  A . opposed to the crankshaft rocking couple B . resonant with the crankshaft natural frequency C . critical fore and aft crankshaft vibrations D . horizontal whipping motions of the crankshaft

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• If an auxiliary diesel engine temperature is higher than normal ,but the thermostat is determined not to be defective you would suspect a /an （）

  A . cavitation erosion in the water jackets B . excess corrosion inhibitor in the coolant C . dirty jacket water cooler D . defective turbocharger

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• Diesel oil may be used to cool （） of a diesel engine.

  A . cylinders B . exhaust valves C . pistons D . fuel valve

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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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• The majority of medium speed and high speed marine diesel engines for main or auxiliary drive operate on the （） cycle.

  A . two-stroke B . four-stoke C . long-stroke D . short-stroke

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• An electrically driven automatically operating auxiliary blower is provided for slow speed and （） of a low speed diesel engine.

  A . manoeuvring operations B . bad combustion C . cooling D . mooring trial

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• Diesel engine mufflers or silencers reduce the engine exhaust noise by （）

  A . passing the exhaust through long head pipes B . diffusing exhaust vibrations through activated carbon baffles C . increasing the exhaust gas velocity D . reducing the exhaust gas velocity

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