单项选择题
If the compression ratio is increased on any diesel engine, （）
A.the expansion ratio will decrease
B.combustion will be slowed down
C.thermal efficiency will decrease
D.thermal efficiency will increase
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相关考题
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单项选择题
If a used lube oil analysis indicates excessive fuel dilution, the lube oil should be （）
A.changed
B.centrifuged
C.filtered
D.settled -
单项选择题
How are the pressure and temperature affected in a diesel engine cylinder during compression?（）
A.Pressure and temperature decrease
B.Pressure and temperature increase
C.Pressure decreases and temperature increases
D.Pressure increases and temperature decreases -
单项选择题
A diesel engine is warmed up and white vapor is in the exhaust，this could indicate （）
A.excessive cylinder lubrication
B.a lugging engine
C.a leaking cylinder liner
D.overloading of one cylinder
