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單項(xiàng)選擇題

Compared to a naturally aspirated diesel engine, a supercharged diesel engine has（）

A.a cylinder air charge of higher pressure
B.increased pumping losses
C.less valve overlap
D.reduced blow-by

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單項(xiàng)選擇題

Late fuel injection occurring at, or after TDC in a diesel engine is indicated by excessive exhaust smoke and （）

A.low exhaust temperature
B.low firing pressure
C.fuel knock in each cylinder
D.mechanical knock in each cylinder

單項(xiàng)選擇題

In a unit injector the amount of fuel that will be forced through the spray nozzle on each stroke of the plunger depends on （）

A.the pump supply pressure
B.the slope of the fuel cam
C.how the plunger is rotated
D.the number of sleeve segments engaged with the rack