單項(xiàng)選擇題

Exhaust valve openings in a diesel engine cylinder head are made as large as practical to （）

A.increase back pressure during the exhaust process
B.facilitate periodic replacement of the valves
C.reduce the pumping loss associated with scavenging
D.reduce tension on valve springs

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單項(xiàng)選擇題

If the compression rings on a diesel engine piston become stuck in the ring groove, the cause may be due to（）

A.excessive ring action
B.excessive ring temperature
C.improper ring rotation
D.excessive ring face wear

單項(xiàng)選擇題

Diesel engine electric starting motors generally require heavier duty motors and motors and operate at higher voltages than comparable starting motors for gasoline engines due to（）

A.higher speed required
B.flywheel-effect
C.lower starting temperatures
D.higher compression pressures

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Exhaust valve openings in a diesel engine cylinder head are made as large as practical to （）

你可能感興趣的試題

If the compression rings on a diesel engine piston become stuck in the ring groove, the cause may be due to（）

Diesel engine electric starting motors generally require heavier duty motors and motors and operate at higher voltages than comparable starting motors for gasoline engines due to（）