单项选择题

If the relief valve on a diesel engine cylinder lifts, the cause could be due to （）

A.liquid in the cylinder
B.low compression in the cylinder
C.high exhaust temperature
D.poor fuel penetration

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单项选择题

Which of the following operation will have a direct impact on the rate of wear in a cylinder liner （）

A.amount of scavenge air to the cylinder
B.quality of fuel injected
C.viscosity of the lube oil
D.compression ratio of the piston

单项选择题

Which of the following reasons represents why the designed compression ratio of a gasoline engine is lower than that of a diesel engine?（）

A.compression must be low for effective spark ignition
B.compression must be low for required horsepower and torque generation
C.compression must be low to prevent pre-ignition
D.compression must be low to have effective pre-ignition

单项选择题

The exhaust system of a diesel engine is usually designed to remove exhaust gases and to （）

A.provide exhaust back pressure
B.prevent exhaust smoke emissions
C.power a reciprocating supercharger
D.muffle exhaust gas noise