Diesel engine automated control systems may utilize sensing devices of dual function, with sensing ranges providing both alarm and engine shut down capability.Which of the key points would only require an alarm sensor?（）

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  A . Low cooling water outlet temperature B . High lube oil pressure C . Low lube oil temperature D . Low starting air pressure

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• A leaking diesel engine fuel injector will cause（）

  A . prolonged maintenance intervals B . improved atomization C . greater fuel economy D . incomplete combustio

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• Diesel engine fuel oil contamination often results in （）

  A . governor malfunctions B . fuel injection system malfunctions C . high cylinder lube oil temperatures D . low intake temperature

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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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• Which of the following is operated from the main engine room console on an automated vessel?（）

  A . Fire pump and lube oil pump B . Lube oil pump and distilling plant C . Distilling plant and shaft alley door D . Shaft alley door and fixed CO2 release

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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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• 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 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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• A restricted air intake to a diesel engine may result in the engine （）.

  A . failing to reach rated speed B . knocking under maximum load C . hunting or surging under light load D . overspeeding and running away

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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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• 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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• The marine diesel engine is a type of diesel engine used on shipsThe _____ of its operation is not very difficult to understand.

  A.principle B.principal C.cause D.case

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