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单选题
Air line lubricators are used in compressed air systems to lubricate （）.
A
the suction and discharge valves
B
tools and equipment served by compressed air
C
air line reducing valves
D
all of the above
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考题
单选题Which of the listed precautions should be taken when cleaning the internals of a motor with compressed air?（）A
Open the machine on both ends so as to allow the air and dust to escapeB
Be certain that the circuit breaker is opened and tagged on the feeder panelC
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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
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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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forced draft air systemC
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