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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 system
B
supply air system
C
ships service air system
D
low pressure deck air system
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Which of the following problems should be taken when cleaning the air filter on a diesel engine equipped with a turbocharger? .A.Reduce engine speed to idle before removing the filterB.Soak the dirty filter in kerosene onlyC.Blow out the air inlet with compressed airD.Cover the air inlet after removing the filter
考题
Restrictions occurring in the small orifices(孔) of pneumatic control system components can be caused by ______.A.moisture in the compressed air supplyB.excessive dryness in the compressed air supplyC.pressure surging in the compressed air receiverD.insufficient lubrication of the system components
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单选题Which of the following statements describes the function of an air compressor intake filter?（）A
Protects against suction valve floatB
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考题
单选题Air blowing from the intake air filter of an operating air compressor indicates （）.A
broken inlet valvesB
broken discharge valvesC
pulsations in the air distribution systemD
overloading of the air distribution system
考题
单选题When used in conjunction with a turbocharger, the main function of an after-cooler is to （）A
increase the density of the cylinder air chargeB
prevent turbocharger overheatingC
liminate the need for a pre-coolerD
remove moisture from air compressed by the turbocharger
考题
单选题Which of the following methods is used to prevent throttling of compressed air through the diesel engine air starting valves?（）A
Holding the valve open for a long periodB
Increasing the starting air pressure usedC
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考题
单选题Restrictions occurring in the small orifices of pneumatic control system components can be used by （）A
moisture in the compressed air supplyB
excessive dryness in the compressed air supplyC
pressure surging in the compressed air receiverD
insufficient lubrication of the system components
考题
单选题On board supply vessels, a centrifuge is normally used to purify（）A
cooling waterB
fuel oilC
sea waterD
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考题
单选题Air line lubricators are used in compressed air systems to lubricate （）.A
the suction and discharge valvesB
tools and equipment served by compressed airC
air line reducing valvesD
all of the above
考题
单选题（）are supplied by main switchboard directly.A
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Air compressor, boiler blower and refrigeration plantC
Boiler blower, Suez Canal searchlight and refrigeration plantD
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考题
单选题Broken valve strips in an operating low pressure, air compressor will cause （）.A
an immediate crankcase explosionB
oil contamination in the compressed airC
a decrease in compressor capacityD
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考题
单选题Gas exchange, which is a basic part of the cycle of an internal combustion engine, is（）A
the supply of normal air and removal of compressed airB
the supply of fuel oil and combustion of the atomized oilC
the supply of fresh air and removal of exhaust gasesD
the supply of fresh air and removal of the extra heat
考题
单选题Compressed air is supplied by air compression to （）.A
the air receiversB
the starting valvesC
the cylinder coversD
the distributors
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
单选题The compressed air is supplied by （） to the air reservoirs.A
compressorsB
forced fansC
ventilatorsD
generators
考题
单选题The air compressor pumps air to the （）.A
expansion tankB
combustion chamberC
air receiverD
evaporator
考题
单选题Compressed air is used on board ship （）.A
for starting diesel enginesB
in pneumatic control systemC
in pneumatic toolsD
All the above are true
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Compressed air is used on board ship for all the following purposes except （）.A
starting diesel enginesB
pneumatic control systemsC
pneumatic toolsD
supercharging air
考题
单选题Which of the following problems should be taken when cleaning the air filter on a diesel engine equipped with a turbocharger?（）A
Reduce engine speed to idle before removing the filterB
Soak the dirty filter in kerosene onlyC
Blow out the air inlet with compressed airD
Cover the air inlet after removing the filter
考题
单选题Air compressor cylinder un-loaders enable the compressor to （）.A
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
单选题Which of the following is a reason why Bob, a technician, should install case fans in the front of acomputer case?（）A
It forces hot air out of the PCB
The fan is easier to remove and cleanC
It forces cooler air into the power supply quicklyD
It forces cooler air across the motherboard
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
control air systemB
forced draft air systemC
supply air systemD
ships service air system
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