The crankshaft of diesel engine is supported by （）.

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• The amount of fuel injected in a particular time, or degree, of crankshaft rotation is termed （）.

  A . metering B . timing C . rate of injection D . rate of distributio

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• The normal color of the exhaust gas of the diesel will be （）

  A . achromatism or thin gray B . thin white C . sky-blue D . black

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• Small crack in the crankshaft bearing surface of a diesel engine are an indication of（）

  A . corrosion fretting B . insufficient lubrication C . abnormal wear D . fatigue failure

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• The cetane rating of diesel fuel is an indication of the（）

  A . ignition quality of the fuel B . calorific value of the fuel C . flash point of the fuel D . rate of fuel consumptio

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• Today, crankshafts for large 2-stroke crosshead engines are of the （）type.

  A . semi-built B . built-up C . solid forged D . individual forged

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• The bedplate must be rigid enough to support the weight of the rest of the engine, and maintain the crankshaft, which sits in the bearing housings in the （）, in alignment.

  A . longitudinal girders B . transverse girders C . fore girders D . aft girder

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• The crankshaft receives and transmits the full working power of the engine and is subjected to fluctuating （）.

  A . bending stresses弯曲应力 B . torsion stresses扭转应力 C . shear stresses剪应力 D . All of the above

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• The crankshaft is of the semi built type, with the journal （） the forged or cast steel crank throws.

  A . being shrunk into B . to be shrunk into C . to be shrunk with D . shrinking into

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• Passages are drilled in the crankshafts of diesel engines to provide lubricating oil to the （）.

  A、main bearings B、connecting rod bearings C、piston pin bushings D、all of the above

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• The purpose of the flywheel of a diesel engine is to （）.

  A . counterbalance the crank throws on the crankshaft B . keep the engine running smoothly between power stroke C . provide a belt-driving surface for the operation of auxiliary machinery D . prevent the engine from overspeeding

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• When the direction handle of telegraph is moved, the relative position of camshaft and crankshaft will be（）

  A . changed accordingly B . unchanged C . positioned ahead D . positioned aster

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• On a four-stroke diesel engine, when the piston is driven downwards by the expanding gas, it delivers power to the crankshaft through the （）.

  A . thrust block B . sounding rod C . connecting rod D . push rod

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• To prevent excessive （） in the transverse girders, the tie bolts are positioned as close to the center of the crankshaft as possible.

  A . thermal stresses B . bending moments C . thermal loads D . surface tensio

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• Vee-type engines have the connecting rods from two cylinders connected to each （） of the crankshaft.

  A . throw B . web C . main bearing D . deflectio

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• A diesel engine which is rated for normal operation at a crankshaft speed of 800 RPM, is commonly classed as a （）.

  A . slow-speed diesel B . medium-speed diesel C . high-speed diesel D . constant-speed diesel

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• Diesel engine crankshaft deflection readings are generally taken at four crank positionsGood engineering practice requires the deflection gage or indicator to be（）

  A . placed as near the crankpin axis as possible B . removed each time the crankshaft is repositioned C . left in place for all four readings D . reset to zero for all four reading

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• Because the timing of injection is crucial, （） mounted on the camshaft, which is driven by the crankshaft are used to operate the fuel pumps, one of which is provided for each cylinder.

  A . gears B . rams C . barrels D . cam

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• An increase in load on a diesel engine results in （） of speed of the crankshaft.

  A . a reduction B . an increase C . an outing D . a downward

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• The highest loads applied to the diesel engine crankshaft main bearings are （）

  A . axial loads B . firing loads C . inertia loads D . centripetal load

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• （） of an engine crankshaft can be detected by measuring deflections of crank webs for each unit of the engine.

  A . Misalignment B . Length C . Strength D . Stresse

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• On a large diesel engine installation, crankshaft axial alignment is maintained by the （）

  A . piston rod guides B . engine thrust bearing C . crosshead bearing D . main shaft flexible coupling

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• The most important factor in engine performance is the actual power output at the end of the crankshaft available for doing workThis is known as （）.

  A . indicated horsepower B . brake horsepower C . net horsepower D . friction horsepower

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• What is the speed of the crankshaft in a four-stroke/cycle engine when the camshaft is turning at 750 rpm?（）

  A . 375 RPM B . 500 RPM C . 750 RPM D . 1500 RPM

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• In four-stroke diesel engine, the cycle of events is completed in （) of crankshaft.A.one

  In four-stroke diesel engine, the cycle of events is completed in () of crankshaft. A.one revolution B.two revolutions C.four revolutions

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