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单选题
Air blowing from the intake air filter of an operating air compressor indicates （）.
A
broken inlet valves
B
broken discharge valves
C
pulsations in the air distribution system
D
overloading of the air distribution system
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the explosion pressure in all cylinders will rise violentlyD
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Disconnect the battery cables from the starting motorB
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单选题Poor combustion in a diesel engine can be caused by （）.A
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单选题Which of the listed operating conditions would have the greatest effect on the volumetric efficiency of an operating reciprocating air compressor?（）A
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The temperature of the air entering the compressorC
The designed rotating speed of the compressorD
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考题
单选题Which of the following problems could cause air to blow out through the inlet air filter of a running compressor?（）A
Excessive compression in the cylinderB
A broken intake valveC
A dirty inlet filter elementD
An improperly adjusted discharge valve
考题
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An air receiverB
An operating valveC
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inlet pipeB
outlet pipeC
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a controlling air bottleC
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Excessive piston blow-by to the manifoldB
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单选题A knocking sound emitted from an unloaded air compressor is probably caused by （）.A
damaged intake valvesB
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insufficient cylinder lubricationD
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考题
单选题In comparison to exhaust valves, intake valves of diesel engines may be fabricated from low alloy steels because （）.A
the beveled edges of the intake valves provide for serf-centering during seatingB
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单选题The air required for combustion is taken from the engine room through a filter fitted on the turbochargerThis reduces the risk for too and contamination of the combustion air（）A
high temperaturesB
low temperaturesC
wetD
dirty
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