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单选题
The purpose of an air compressor unloading device is to （）
A
drain water from the air receiver
B
drain water from the cylinders
C
delay the compression process until the motor is up to speed
D
check pump alignment
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charge air receiverB
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单选题The unloading system on an air compressor will （）.A
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单选题（）are supplied by main switchboard directly.A
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考题
单选题Before starting an air compressor, It should be （）.A
unloadedB
primedC
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考题
单选题The air compressor pumps air to the （）.A
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combustion chamberC
air receiverD
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考题
单选题Air compressors are equipped with unloading systems for the purpose of（）.A
removing all but the frictional load during startingB
relieving intercoolers of high temperature buildupsC
providing high starting torque in the drive motorD
seating valve plates during compressor shutdown
考题
单选题The purpose of an air compressor unloading device is to （）A
drain water from the air receiverB
drain water from the cylindersC
delay the compression process until the motor is up to speedD
check pump alignment
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A compressor should never be stopped （）.A
without first cooling itB
without first heating itC
without first unloading itD
without first loading it
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
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单选题The purpose of the refrigeration system low pressure cutout switch is to （）A
protect the compressor from liquid flood backB
protect the compressor from low discharge pressureC
start and stop the compressor upon system demandD
start the compressor after a drop in the evaporator pressure
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combustion control air systemB
supply air systemC
ships service air systemD
low pressure deck air system
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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
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单选题Starting air for auxiliary engines may be taken directly from the main reservoirs or through （）.A
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an emergency air compressorD
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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
考题
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monthlyD
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单选题The loss of （） from an air compressor could lead to an overheated air discharge and possibly an explosion in the pipelines leading to the air reservoir.A
lubricating oilB
compressed airC
cooling waterD
sealing ring
考题
单选题Usually, emergency electricity supplies to on board（）A
Cargo winchB
WindlassC
Steering gearD
Main air compressor
考题
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
insufficient intercooler coolingD
low ambient air pressure
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
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