單項(xiàng)選擇題

Abnormal crankpin bearing and piston skirt surface wear indicate（）

A.a restricted air intake
B.a clogged connecting rod oil passage
C.incorrect connecting rod alignment
D.high cylinder firing temperatures

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單項(xiàng)選擇題

Injection lag in a diesel engine may be caused by（）

A.a higher cetane number of fuel oil
B.the diesel fuel used having a high viscosity
C.mechanical rigidity in the lube pump mechanism
D.a decrease rigidity in the fuel pump delivery pressure

單項(xiàng)選擇題

Which of the following relationships should occur between the temperature developed in a combustion space, and the compression ratio of the engine?（）

A.Higher compression ratios create higher temperature
B.Higher temperatures create higher compression ratios
C.low temperatures create higher compression ratios
D.Higher compression ratios create low temperatures