單項(xiàng)選擇題

The expansion tank for a diesel engine closed cooling system is designed to maintain a constant head on the system and （）.

A.reduce water temperature
B.reduce water turbulence
C.provide an air cushion
D.allow for an increase in water volume as the engine warms up

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單項(xiàng)選擇題

For a continuous operation diesel engine, a duplex filter unit would be the best arrangement because （）.

A.changing filter elements would not interrupt engine operation
B.filtering occurs twice in each pass of oil through the system
C.clogging will not occur
D.dropping pressure is half of that through a single filter unit

單項(xiàng)選擇題

An increase in the air inlet manifold pressure of a diesel engine will result in a/an （）.

A.decrease in maximum cylinder pressure
B.increase in ignition lag
C.decrease in fuel consumption per horsepower-hour
D.decrease in exhaust manifold pressure