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单选题
The average pressure exerted on piston during each power stroke is termed（）
A
indicated horsepower
B
mean effective pressure
C
exhaust back pressure
D
compression pressure
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考题
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单选题Which statement about diesel engine combustion is true?（）A
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单选题During which of the listed piston stroke of a four-stroke/cycle diesel engine, is the piston moving downward?（）A
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单选题An axial轴向 piston pump differs from a radial piston pump as the pistons of an axial piston pump are positioned （）.A
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it has a longer power strokeB
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0~95MpaC
1~05MpaD
0~5Mpa
考题
单选题If clearance between a piston and the cylinder wall is excessive, piston slap will occurThe slap itself is caused by （）A
alternation of side thrustB
a breakdown of the lube oil film on the cylinder wallC
worn piston boss piston pin bearingsD
fluctuating gas pressure in the combustion space
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the power strokeB
the compression strokeC
low load operation onlyD
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contractionB
retractionC
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shrinkage
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单选题A piston in a four-stroke/cycle diesel engine makes four strokes during each （）.A
crankshaft revolutionB
mechanical cycle of operationC
period of two combustion cyclesD
cycle of two events
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