单项选择题
Cold clearances between the skirt of an aluminum piston and the cylinder liner is about （）
A.twice as large as with a cast iron piston
B.the same size as with a cast iron piston
C.half as large as with a cast iron piston
D.the same size as the crown of an aluminum piston
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相关考题
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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 -
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
