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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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increase the density of the cylinder air chargeB
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Holding the valve open for a long periodB
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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
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单选题Air line lubricators are used in compressed air systems to lubricate （）.A
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air line reducing valvesD
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BDCB
TDCC
BBDCD
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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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densityC
viscosityD
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compressorsB
forced fansC
ventilatorsD
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supply air systemC
ships service air systemD
low pressure deck air system
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starting diesel enginesB
pneumatic control systemsC
pneumatic toolsD
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vary their speed according to temperature and loadB
start and come up to speed before air compression beginsC
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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
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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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