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单选题
An un-loader is installed on an air compressor to （）.
A
bypass the high pressure stage to the low pressure stage on 100% of the air compressors in service
B
prevent excessive inter-stage pressure buildup
C
control compressor discharge pressure
D
remove all but the frictional load during starting
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更多 “单选题An un-loader is installed on an air compressor to （）.A bypass the high pressure stage to the low pressure stage on 100% of the air compressors in serviceB prevent excessive inter-stage pressure buildupC control compressor discharge pressureD remove all but the frictional load during starting” 相关考题
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damage to the un-loader operating diaphragmB
an increase in current flow to the motorC
high pressure in the receiver and filterD
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leaking discharge valveB
jammed suction valveC
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broken discharge un-loader
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单选题The unloading system on an air compressor will （）.A
increase compressor discharge pressure on demandB
increase compressor operating speed as necessaryC
allow the motor to turn the compressor opposed only by frictionD
reduce the compressor frictional load when starting
考题
单选题（）are supplied by main switchboard directly.A
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考题
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oil contamination in the compressed airC
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单选题Before starting an air compressor, It should be （）.A
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单选题The air compressor pumps air to the （）.A
expansion tankB
combustion chamberC
air receiverD
evaporator
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inter coolerB
cylinderC
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考题
单选题The air compressor pumps air to the （）.A
air cylinderB
combustion chamberC
steam drumD
expansion tank
考题
单选题The air compressor pumps air to the（）.A
engine cylinderB
air bottleC
evaporatorD
condenser
考题
单选题The air filter is fixed in the （） of an air compressor.A
inlet pipeB
outlet pipeC
inter coolerD
after cooler
考题
单选题The air charge leaving an intercooler, or after-cooler of an air compressor can be expected to be （）.A
superheatedB
super-cooledC
at or below the dew pointD
All of the above
考题
单选题If an air compressor is used to supply compressed air to outlets throughout the engine room and on deck of a vessel, the system is known as the （）.A
combustion control air systemB
supply air systemC
ships service air systemD
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考题
单选题An un-loader is installed on an air compressor to （）.A
bypass the high pressure stage to the low pressure stage on 100% of the air compressors in serviceB
prevent excessive inter-stage pressure buildupC
control compressor discharge pressureD
remove all but the frictional load during starting
考题
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an auxiliary reservoirB
a controlling air bottleC
an emergency air compressorD
a main air compressor
考题
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vary their speed according to temperature and loadB
start and come up to speed before air compression beginsC
change speed according to overload demandsD
reduce compressed air charge density
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reclaims waterB
purges air without losing refrigerantC
purges air with some loss of refrigerantD
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考题
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单选题Usually, emergency electricity supplies to on board（）A
Cargo winchB
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单选题Excessively low air pressure occurring in the intercooler of a reciprocating air compressor is caused by（）.A
leaky discharge valves on the LP cylinderB
leaky discharge valves on the HP cylinderC
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考题
单选题If an air compressor is used to supply air primarily to the combustion control system and other pneumatic controllers, the entire system is known as the （）.A
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考题
单选题“This increase in charge air density is accomplished on most modern diesel engine types by use of exhaust gas turbo-charging, in which a turbine wheel driven by exhaust from the engine is rigidly coupled to a centrifugal type air compressor” According to this sentence, we can know that increases density（）, drives the compressor directly（）A
a modern diesel engine；a turbine wheelB
a modem diesel engine；exhaust gasesC
a compressor；an exhaust gas turbochargerD
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