单项选择题
Distortion of the spray pattern of a nozzle or injector may be indicated by a/an（）
A.high firing pressure
B.overload of that particular cylinder
C.smoky exhaust
D.cooling water temperature rise
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相关考题
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单项选择题
The rate of pressure rise during the period following fuel ignition in a diesel will result in （）
A.valve overlap
B.volumetric efficiency
C.turbulence of the air change
D.fuel efficiency -
单项选择题
Higher than normal temperature air passing through the intake of a diesel engine will result in（）
A.greater overall efficiency
B.greater fuel economy
C.lower horsepower
D.lower compression ratio -
单项选择题
Air scavenging of a diesel engine cylinder（）
A.blows out the exhaust gases
B.supplies oxygen for combustion
C.cools the valves and cylinder walls
D.all of the above
