單項(xiàng)選擇題Faulty operation of diesel engine fuel injection nozzles can be directly caused by ().

A.water in the fuel oil supply
B.excessive fuel nozzle holder cooling
C.a distorted fuel spray pattern
D.leakage past the plunger into the oil drain


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2.單項(xiàng)選擇題A large, low-speed, crosshead, main propulsion diesel engine using residual fuel oils must have a cylinder oil having a ()

A.low TBN value
B.high alkaline reserve
C.low flash point
D.high pour point

3.單項(xiàng)選擇題In a four-stroke/cycle diesel engine, after the completion of the power stroke, the piston will move()

A.up and draw in a fresh air charge
B.down to burn off fuel
C.down to compress the fuel air charge
D.up and force out the exhaust gases

4.單項(xiàng)選擇題A fuel injection valve opening at pressure lower than normal will result in().

A.late fuel injection
B.early fuel injection
C.high exhaust temperature from that cylinder
D.decreased effective stroke from that injector