A.injector
B.positive displacement
C.centrifugal
D.centripetal
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A.injector pumps
B.positive displacement pumps
C.centrifugal pump
D.centripetal pumps
A.the mechanical seal
B.packed stuffing boxes
C.either A or B
D.neither A nor B
As for a hydraulic vane pump, which of the following is in contact with the vanes during working: ()
(1)the rotor
(2)the pump shaft
(3)the external surface of the housing
A.(1) only
B.(2) only
C.(1) and (2)
D.(1),(2)and(3)
A.circular
B.elliptical
C.rectangular
D.hexagon
A.suction
B.exhaust
C.pressure
D.discharge
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
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If you are given the job of adding hydraulic fluid to a mooring winch, and are not certain as to the type of fluid to use, you should ().
Low compressor head pressure in a refrigeration system can be caused by().
The rate of heat transfer between the hot and cold fluids passing through a shell-and-tube type heat exchanger will ().
If the head pressure of a reciprocating refrigeration compressor is excessive, ().
If the suction pressure at the refrigeration compressor is below normal, the cause can be().
The general purpose of a heat exchanger is to ().
A salinity indicator is used to determine the ().
The rate of heat transfer from a hot region to a cold region is affected most by the ().
The usual symptoms of cavitation in a centrifugal pump is ().
Pitting in the suction areas of a centrifugal pump bronze impeller is usually caused by ().