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单选题
When one cylinder has a lower compression pressure and higher exhaust gas temperature than any of the other engine cylinders, which of the conditions listed will indicated?（）
A
Advanced ignition
B
Clogged air intake
C
Leaky exhaust valve
D
High exhaust pressure
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be jammedB
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单选题Late fuel injection timing is indicated by （）A
lower than normal cylinder pressure and low exhaust temperatureB
lower than normal cylinder pressure and high exhaust temperatureC
higher than normal cylinder pressure and low exhaust temperatureD
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单选题A practical way of checking for excessive fuel injection in one cylinder of an operating diesel engine is to （）A
feel the high pressure fuel lineB
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单选题The loss of the diesel engine cylinder air charge through leaky valves, piston rings, worn or scored liners, would be indicated by which of the following sets of conditions?（）A
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Low compression pressure and low exhaust temperatureD
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overloading the engineB
low exhaust valve liftC
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单选题A drop in compression pressure in one cylinder of a diesel engine can be caused by（）A
a leaking fuel injection nozzleB
a clogged air filterC
early fuel injectionD
burned valves
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early fuel injection timingB
leaking valvesC
a continuously open scavenge air portD
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单选题Low compression pressure in a diesel engine is caused by（）A
low water in the expansion tankB
improperly seated valvesC
low fuel oil pressureD
worn or broken cylinder liner sealing rings
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单选题The diffuser prevents pressure pulses from one cylinder （） another during operation.A
to interfere withB
interfering withC
to help scavengingD
helping scavenging
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nuts and boltsB
new jointsC
spring forceD
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单选题Which one is not the normal operation for boiler shutdown?（）A
Carry out soot blowing if permissibleB
Change fuel supply to diesel oilC
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单选题In a diesel engine, when the fuel is injected into the cylinder,（）A
the piston is just coming upward from the bottom dead centerB
the piston has moved about one-fifth of the way upC
the piston has moved most of the way up and almost reached the TDCD
the piston has just past the TDC
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单选题The arrangement and shape of the cams on a diesel engine camshaft directly control which of the listed groups of operating conditions?（）A
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fuel consumption, efficiency, and cylinder pressureD
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单选题The longer the ignition delay period occurs in a diesel engine, the （）.A
less fuel will enter the cylinderB
lower will be cylinder compression temperaturesC
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excessive mechanical clearance between the piston crown and cylinder headC
excessively worn fuel pump plungerD
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reduce fuel booster pump pressureC
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justB
nearlyC
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单选题A common rail engine has only one or two high pressure pumps in operation at the same（）time, and the injection into each cylinder.A
can’t be controlled very preciselyB
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考题
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考题
单选题The single acting cylinder is the simplest form where pressure is applied to the full area of the piston head to move the load through piston rod extensionThe load causes rod （） when the drive pressure is released.A
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