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
相关考题
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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 -
单项选择题
If the piston groove drain holes for the oil control rings become clogged, which of the following is likely to occur?（）
A.The oil control rings will seal improperly and wear rapidly
B.The piston will overheat due to insufficient lubrication
C.Excessive oil will remain on the cylinder wall
D.Light brown smoke will emanate from the engine exhaust -
单项选择题
Many cast iron pistons are designed with heat dams, which serve to （）
A.keep piston crown temperatures elevated for smoother combustion
B.reduce the possibility of overheating the top compression ring
C.help retain the heat of compression to prevent ignition delay
D.help retain the heat of compression to prevent combustion knock
