单项选择题
Which statement about diesel engine combustion is true?（）
A.Combustion does not begin until the piston starts down on the power stroke
B.Maximum combustion pressure is reached before TDC
C.Turbulence in the cylinder causes a delay in ignition
D.Maximum cylinder firing pressure is not developed until the piston passes TDC
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相关考题
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单项选择题
Diesel engine exhaust gas temperatures can be used to determine individual cylinder （）.
A.performance
B.horsepower output
C.fuel consumption
D.scavenge effect -
单项选择题
Improper cooling of a diesel engine cylinder liner due to the accumulation of scale deposits may cause （）.
A.low compression pressure
B.increased piston wear
C.increased cylinder lube oil consumption
D.poor contact between compression rings and liner -
单项选择题
In describing engine operation, what does the term “cycle” mean?（）
A.The sequence of events that produce a power pulse
B.One rotation of the engine crankshaft
C.One stroke of a piston
D.All of the above
