单项选择题
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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相关考题
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单项选择题
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 -
单项选择题
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 -
单项选择题
The size of the exhaust valve opening is （）
A.most critical in a four-stroke cycle diesel engine
B.most critical in a two-stroke/cycle diesel engine
C.most critical in a four-stroke/cycle diesel engine if it is turbocharged
D.of equal importance in a two-stroke/cycle diesel engine as in a four-stroke/cycle diesel engine
