Four strokes consist of suction, compression, （） and exhaust stroke.

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• Which of the following statements is true regarding the installation of piston rings on two-stroke/cycle, diesel engines as compared to four-stroke/cycle, diesel engines?（）

  A . In a two-stroke/cycle engine, the rings run hotter, requiring the end gap to be greater B . Some provision must be made in a two-stroke/cycle engine to keep the rings from binding in the ports C . No gap is required to exist between the ends of the ring when cold in a two-stroke/cycle engine, but a small gap is required in a four-stoke/cycle engine D . The gaps should be staggered on either side of a piston in a two-stroke/cycle engine, while staggering is not necessary in a four-stroke/cycle engine

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• One of the differences between a two-stroke engine and a four-stroke engine is,（）

  A . a two-stroke engine can’t work without cylinders B . a two-stroke engine can’t work without pistons C . a two-stroke engine can’t work without crankshafts D . a two-stroke engine can’t work without a blower

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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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• A two-stroke diesel engine exhaust temperature will be lower than a four-stroke diesel engine of the same displacement because the （） (1) MEP is lower and the scavenging air is cooling the exhaust gases (2) valve overlap in a four-stroke

  A . (1) only is correct B . (2) only is correct C . both (1) and (2) are correct D . Neither (1) or (2) are correct

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• If the turbocharger of a four-stroke/cycle diesel engine fails to operate, which of the following statements best describes the probable effect?（）

  A . Intake manifold pressure will be high B . Intake manifold pressure will be unaffected C . Exhaust temperatures will be high D . Exhaust temperatures will be low

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• Compared to four-stroke/cycle engines, two-stroke/cycle diesel engines have the disadvantage of （）

  A . less even torque B . higher cylinder head temperatures C . fewer power strokes per revolution D . greater weight/size requirement

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• Which of the following statements is correct regarding a turbocharged four-stroke/cycle diesel generator?（）

  A . At zero load the intake manifold pressure is greater than the exhaust manifold pressure B . At full load the intake manifold pressure and exhaust manifold pressure are equal C . At full load the intake manifold pressure is less than the exhaust manifold pressure D . At full load the intake manifold pressure is greater than the exhaust manifold pressure

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• High exhaust temperatures from all of cylinder of a turbocharged, four-stroke/cycle diesel engine can be caused by an（）

  A . inoperative turbocharger B . inadequate fuel supply C . overload on one cylinder D . unequal load distributio

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• The working cycle of a four-stroke diesel engine consists of four events:（） (1) compression (2) expansion (3) exhaust (4) suctionThe correct sequence is

  A . (4)-(2)-(3)-(1) B . (4)-(3)-(1)-(2) C . (4)-(3)-(2)-(1) D . (4)-(1)-(2)-(3)

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• （）is the main reason that reduces the power advantage of a two-stroke engine over a same size four-stroke one to about（）

  A . Inefficient scavenging；twice B . Inefficient scavenging；1~8 times C . Fewer strokes in a circle；twice D . Fewer strokes in a circle；1~8 time

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• In a four-stroke/cycle diesel engine, after the completion of the power stroke, the piston will move（）

  A . up and draw in a fresh air charge B . down to burn off fuel C . down to compress the fuel air charge D . up and force out the exhaust gase

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• If a four-stroke/cycle diesel engine is running at 1550 RPM, the speed of the camshaft will be（）.

  A . 525 RPM B . 775 RPM C . 1550 RPM D . 1800 RPM

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• During the power stroke of a four-stroke/cycle diesel engine, most of the side thrust of a trunk-type piston is absorbed by the（）

  A . piston skirt B . pinion C . crosshead D . compression ring

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• According to the principle of four stroke diesel engine, what is the number of its efficient work stroke per revolution?（）

  A . 1/2 B . 1 C . 2 D . 3

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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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• The reversing cams of some four-stroke/cycle diesel engines are brought into position by （）

  A . sliding the camshaft along its axis B . rotating the cam 180 C . rotating the cam followers 180 D . moving the idler sprockets in the drive chai

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• A disadvantage of a four-stroke/cycle diesel engine is （）

  A . higher working temperature of piston and cylinder B . the use of scavenge ports C . fewer power strokes per revolution of the crankshaft D . part of the fuel is burned as the piston is moving away from top dead center

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• Siheyuanis a four-side A courtyard, it usually consists of houses on its four sides with a B in the center.

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• The prizes for the champions in the four competitions usually consist of an exchange program in foreign countries.

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• During the power stroke of a four-stroke/cycle diesel engine, most of the side thrust of a trunk-type piston is absorbed by the_____________.

  A.piston skirt B.pinion C.crosshead D.compression rings

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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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• The four strokes of a four-stroke diesel engine according to their sequence are :suction,compression,expansion and exhaust.()

  此题为判断题(对，错)。

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• Among the four strokes of a four-stroke diesel engine,suction and expansion strokes are the upward strokes.()

  此题为判断题(对，错)。

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