单项选择题

Fuel oil injected into the cylinder of a diesel engine just after the piston passes top dead center, will（）

A.increase engine power
B.increase engine load
C.decrease engine power
D.improve fuel economy

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单项选择题

Diesel engine injection lag is caused by（）

A.compressibility of the fuel
B.high fuel oil supply flow
C.scored plunger and barrel packing
D.excessive air turbulence

单项选择题

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

单项选择题

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