单项选择题
During the fuel injection period, fuel pressure must exceed cylinder gas pressure to （）.
A.ensure penetration and distribution of the fuel in the combustion chamber
B.ensure the needle valve is flushed clean during each injection
C.prevent combustion gas blowback into the open needle valve
D.prevent reflected pressure waves when the needle valve closes
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相关考题
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单项选择题
A naturally aspirated diesel engine at full throttle will have an intake manifold pressure （）
A.slightly less than atmospheric pressure
B.approximately equal to exhaust manifold pressure at all times
C.that is widely fluctuating constantly
D.decreasing as engine load increases -
单项选择题
The lube oil pump used in a diesel engine is a （）.
A.volute pump
B.centrifugal pump
C.diaphragm pump
D.gear pump -
单项选择题
Most fuel injection nozzles are opened by （）.
A.fuel oil pressure
B.a cam operated follower
C.a spring-loaded pressure plate
D.timing gears keyed to the crankshaft
