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单选题
In a common rail engine, the fuel is injected into cylinders（）
A
by injection pumps
B
at a time decided by the injection pump timing
C
by a signal opening the magnetic valves
D
at a time decided by the cam directly
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Shut off the fuel supply and block the flow of intake airD
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单选题Fuel has to be injected into the engine at a high pressure so that it （） correctly.A
is purifiedB
in timedC
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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A diesel engine fails to start because of water in the fuelIn order to start the engine, you should （）?A
turn engine with jacking gearB
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单选题Turbulence is created in the cylinders of a diesel engine to （）A
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单选题In conventional systems, the injection pressure（）, while it’s（）in common rail diesel engines.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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ignition may be delayedB
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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
at a time decided by the cam directly
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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 lineB
pumped by the injection pumpC
at low pressureD
already atomized
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incorrect adjustmentsB
dirty fuelC
broken fuel linesD
excessive vibration
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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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