單項選擇題

One result of operating a diesel engine at light load with excessively low cooling water temperature is a/an （）

A.decrease in ignition lag
B.increase in fuel economy
C.reduction in lube oil viscosity
D.increase in cylinder misfiring

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單項選擇題

The plunger in a jerk pump is rotated until the release port is uncoveredIf the port remains uncovered all of the time, which of the listed operations will occur?（）

A.No fuel will be delivered
B.The maximum effective stroke will be attained
C.The fuel delivered to the cylinder will be excessive
D.The injection nozzle will overheat and carbonize

單項選擇題

If the compensating needle valve of a hydraulic governor is opened more than necessary the governor will （）

A.have a larger than normal dead band
B.produce excessive speed response to a load change
C.respond slowly to any change in engine load
D.stabilize engine speed at the new governor setting