Diesel engines obtain combustion air through turbo chargers，blowers，or（）.

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• Engine coolant accumulating in the diesel engine lubricating oil can result from a （）

  A . low oil pressure B . high coolant pressure C . leaking fuel injector D . cracked cylinder head or liner

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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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• 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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• Before starting a diesel engine that has an engine driven lube oil pump, the engineer should （）.

  A . open the bypass line B . cut in the lube oil cooler C . pressurize the lube oil system D . top off the expansion tank

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• An over-speed trip stops a diesel engine when the engine （）

  A . runs out of fuel B . has low lubricating oil pressure C . exceeds a set maximum speed D . has high cooling water temperature

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• An efficient seal between the cylinder block and cylinder heads on many diesel engines is obtained with（）

  A . graphite packing B . sealing compound C . lubricating oil D . gasket

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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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• Immediately after any diesel engine is started, the engineer should check the （）

  A . crankcase pressure B . lube oil pressure C . saltwater pressure D . exhaust temperature

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• Air scavenging of a diesel engine cylinder（）

  A . blows out the exhaust gases B . supplies oxygen for combustion C . cools the valves and cylinder walls D . all of the above

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• The indicated power of an engine can be obtained by taking the （）.

  A . precautions B . rpm C . indicator cards D . B and C

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• The term diesel engine scavenging means（）

  A . delivering more air into the cylinder than it would normally receive during an ordinary charging process B . forcing the products of combustion out of the cylinder with the fresh air charge C . collecting the air charge at the cleaner D . combustion and expansion of hot ga

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• Diesel engine mufflers accomplish noise reduction by （）

  A . reducing exhaust gas velocity B . increasing the frequency of gas vibration C . the use of long head pipes D . the use of zinc electrode

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• The diesel engine is a type of （）.

  A、A. turbine engine B、B. gas turbine C、C. steam engine D、D. internal combustion engine

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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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• All diesel engines are classified as（）.

  A . four cycle B . compression ignition C . vacuum ignition D . external combustio

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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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• Proper lubrication of the main bearing is more easily obtained in a single acting four-stroke/cycle diesel engine than in a single acting two-stroke/cycle diesel engine because （）

  A、a circulating system; a total loss system B、a total loss system; a circulating system C、an opened system; a closed system D、a closed system; an opened system

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• Proper lubrication of the main bearings is more easily obtained in a single acting, four-stroke/cycle diesel engine than in a tow-stroke/cycle diesel engine because（）.

  A . The direction of pressure on the journal in four-stroke engine is continuously B . positive feed lubricators are installed on all bearings of four-stroke engine, whereas as a splash feed system is used on tow-stroke engine C . four-stroke engines usually utilize a heavier grade of oil than tow-stroke engines D . Low-stroke engines usually consume less lube oil than four-stroke engine

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• Main diesel engine control can be obtained by the bridge （）

  A . at any time B . only after the engine room control station is switched to ‘bridge control’ C . whenever the secondary station is switched to ‘bridge control’ D . whenever the engine side control station is switched to ‘bridge control&rsquo

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• Some diesel engines are supercharged with a （）

  A . slam charger B . turbocharger C . fuel atomizer D . fuel injector

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• "Scavenging" on a diesel engine means （）.

  A . injecting fuel oil into a cylinder B . removing exhaust gases from the cylinder C . forcing air into the cylinders under pressure after the exhaust valve has dosed D . a combination of all the above

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• “The engine not obtaining the sufficient speed for firing” means that （）.

  A . the start fails B . the fuel pumps will be put into operation C . the fuel valves are damaged D . the combustion process will take over

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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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• In a diesel engine, blow-by（）

  A . increase exhaust back pressure B . causes excessive crankcase pressure C . can only be detected by a compression check D . decreases fuel consumptio

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