A.suction
B.exhaust
C.pressure
D.discharge
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A.draw the liquid in;force the liquid out
B.force the liquid out;draw the liquid in
C.suction;draw
D.deliver;outlet
A.throttling the pressure line
B.changing the speed of the rotor
C.either A or B
D.None of the above is tree
Which of the following pumps are self-priming, and can deal with liquid from a level below the pump? ()
(1) reciprocating
(2) rotary
(3) centrifugal
A.(1)only
B.(1)and (2)
C.(1),(2)and(3)
D.(2)and(3)
A.throttling the pressure line
B.changing the speed of the driving rotor
C.either A or B
D.None of the above is tree
A.throttling the pressure line
B.changing the speed of the piston
C.either A or B
D.None of the above is tree
最新試題
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When a refrigeration compressor has developed a high head pressure as a result of a refrigerant overcharge, you should ().
One cause of high head pressure occurring in a refrigeration system can be ().
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