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单选题
In common rail engines, the fuel is（） before is injected into the cylinders.
A
stored in a common fuel line
B
pumped by the injection pump
C
at low pressure
D
already atomized
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单选题Fuel has to be injected into the engine at a high pressure so that it （） correctly.A
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in timedC
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单选题In the common rail system, excessive pressure in the header may be caused by （）A
improper adjustment of the bypass valveB
a dribble in the fuel injection nozzleC
insufficient leak-off through injection nozzle packingD
a malfunctioning injection nozzle
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单选题When fuel is injected late into a diesel engine cylinder,（）.A
the exhaust will be clearB
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单选题The viscosity regulator controls （） in order to provide oil at the correct viscosity for combustion.A
the engines speedB
the engines loadC
the fuel oil temperatureD
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单选题In conventional systems, the injection pressure（）, while it’s（）in common rail diesel engines.A
fluctuates with the engine speed to some extent, independent of the engine speedB
keeps constant at all engine speed, dependent on the engine speed to some extentC
keeps constant at all engine speed, independent of the engine speedD
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单选题The amount of fuel injected in a particular time, or degree, of crankshaft rotation is termed （）.A
meteringB
timingC
rate of injectionD
rate of distribution
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单选题The common rail engines show great advantages in combustion especially（）.A
at high speed and full loadB
at low speed and part loadC
when heavy fuel oil is used at seaD
when the ships run long distance
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单选题Which of the following problems may occur if the opening pressure of a fuel injection nozzle is greater than specified by the engine manufacturer?（）A
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单选题（） into the cylinder because no fuel can burn （） it.A
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单选题（）uses one or two high pressure pumps for all the cylinders with one more standby, while（）have a separate high-pressure pump for each cylinder.A
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单选题Fuel injected into a diesel engines cylinder is ignited by （）.A
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increase engine powerB
increase engine loadC
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考题
单选题Fuel has been injected but ignition fails The possible cause may be （）.A
leaky exhaust valveB
increased scavenging air temperatureC
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考题
单选题In a common rail engine, the fuel is injected into cylinders（）A
by injection pumpsB
at a time decided by the injection pump timingC
by a signal opening the magnetic valvesD
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单选题When an engine is starting and has got a sufficiently high speed, say about 20 rpm,（）A
the starting air supply is cut off and fuel is injected into the cylindersB
the fuel feeding is cut off and the turning gear is put inC
the starting air supply is cut off and turning gear is taken outD
the electric blower is shut down and fuel is injected into the cylinders
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