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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1.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

2.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

3.單項(xiàng)選擇題If an auxiliary diesel engine temperature is higher than normal ,but the thermostat is determined not to be defective you would suspect a /an （）

A.cavitation erosion in the water jackets
B.excess corrosion inhibitor in the coolant
C.dirty jacket water cooler
D.defective turbocharger

4.單項(xiàng)選擇題Which of the following beneficial results can be expected from supercharging a previously naturally aspirated engine?（）

A.Increased turbulence
B.increased mechanical efficiency
C.Increased brake mean effective pressure
D.All of the above

5.單項(xiàng)選擇題Late fuel injection in a diesel engine is indicated by low firing pressure with（）

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