单项选择题

To reduce the weight of the reciprocating parts, pistons of high-speed engines are made considerably shorterThis results in （）

A.less piston slap and quieter running
B.increased crankshaft bearing wear
C.slightly greater piston wear
D.decreased side pressures

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单项选择题

Which of the following statements concerning cylinder liner wear is true?（）

A.Liner wear is distributed equally between the upper and lower portions of the cylinder
B.Excessive liner wear causes wear between piston ring and groove
C.Excessive, but uniform liner wear will not cause wear between piston ring and groove
D.Liner wear is normally greatest in the middle of the cylinder

单项选择题

If clearance between a piston and the cylinder wall is excessive, piston slap will occurThe slap itself is caused by （）

A.alternation of side thrust
B.a breakdown of the lube oil film on the cylinder wall
C.worn piston boss piston pin bearings
D.fluctuating gas pressure in the combustion space

单项选择题

Poor quality fuel being used in a turbocharged medium-speed, diesel engine could result in （）

A.hard starting
B.excessive fuel consumption
C.loss of power
D.all of the above