单项选择题

Heat for igniting the fuel oil in the cylinder of a diesel engine is generated by the （）

A.electronic ignition system
B.compression of air by the piston
C.friction in the fuel injector
D.fuel oil bearing system

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单项选择题

Diesel engine crankshaft deflection readings are generally taken at four crank positionsGood engineering practice requires the deflection gage or indicator to be（）

A.placed as near the crankpin axis as possible
B.removed each time the crankshaft is repositioned
C.left in place for all four readings
D.reset to zero for all four readings

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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

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