单项选择题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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1.单项选择题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

3.单项选择题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

4.单项选择题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

5.单项选择题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

7.单项选择题Which of the engine components listed increases air charge density and helps to improve engine operating efficiency?()

A.Intake manifold
B.Water-cooled exhaust system
C.After-cooler
D.Exhaust diffuser

8.单项选择题A diesel engine will lose power if fuel injection occurs too early because the ()

A.fuel will not be properly atomized in the cylinder
B.ignition will be delayed due to low ignition temperature
C.maximum fuel expansion will occur on the compression stroke
D.fuel will ignite before top dead center

9.单项选择题The air supplied to the cylinders by a turbocharger is often reduced in volume by a/an ()

A.air compressor
B.diffuser
C.after-cooler
D.ventilator

10.单项选择题Which of the listed set of conditions indicates early fuel injection timing?()

A.Loss of engine power and high exhaust temperatures
B.Higher than normal firing pressure and low exhaust temperatures
C.High fuel consumption and high exhaust temperatures
D.Lower than normal compression pressure and high exhaust temperature

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