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单选题
The primary task of the compressed air system is to deliver the starting air necessary for （）
A
starting the ME
B
starting the emergency electric alternator
C
driving the main turbine
D
driving the turbocharger
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单选题Which of the following statements describes the function of an air compressor intake filter?（）A
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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
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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
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单选题Air line lubricators are used in compressed air systems to lubricate （）.A
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tools and equipment served by compressed airC
air line reducing valvesD
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单选题The compressed air is admitted to each cylinder through a cam operated by starting air valve when the piston has just passed its （）.A
BDCB
TDCC
BBDCD
ATDC
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单选题Which of the fluids listed is normally used to condense the primary refrigerant in a shipboard central air conditioning system?（）A
Air or NitrogenB
Seawater or Fresh waterC
Sodium Nitrate brineD
Calcium Sulfate brine
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safety valveB
indicator cockC
blow-down valveD
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an immediate crankcase explosionB
oil contamination in the compressed airC
a decrease in compressor capacityD
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densityC
viscosityD
calorific value
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the starting valvesC
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compressorsB
forced fansC
ventilatorsD
generators
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combustion control air systemB
supply air systemC
ships service air systemD
low pressure deck air system
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starting diesel enginesB
pneumatic control systemsC
pneumatic toolsD
supercharging air
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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
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单选题In the suction stroke air is induced into the cylinder （）In the compression stroke the air is compressed.A
by an fuel valveB
through an inlet valveC
with an exhaust valveD
from an outlet valve
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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