单项选择题
During the valve overlap period, the exhaust pressure of a turbochargers, four-stroke/cycle diesel engine must be less than the intake manifold pressure to ensure （）
A.effective cylinder scavenging and cooling
B.constant pressure from the turbochargers
C.cooler operation of the exhaust system
D.effective constant pressure for turbocharger operation
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相关考题
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单项选择题
Which of the listed diesel engine systems is likely to create the problem of a cylinder regularly misfiring?（）
A.Lubrication
B.Cooling
C.Fuel
D.Electric ignition -
单项选择题
When the normal compression ratio of a diesel engine is not very high, misfiring at light loads may be caused by （）
A.overloading the engine
B.low exhaust valve lift
C.excessive cylinder cooling
D.insufficient mechanical clearance -
单项选择题
In a two-stroke/cycle diesel engine, the exhaust gases are expelled from the cylinder by the（）
A.exhaust manifold
B.valve bridge
C.pressure of the fresh air charge
D.valve adjusting gear
