A.reciprocating pumps
B.positive displacement pumps
C.centrifugal pumps
D.centripetal pumps
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A.positive displacement
B.ejector
C.centrifugal
D.air compressor
A.single screw pump
B.double-screw pump
C.triple screw pump
D.centripetal pump
A.steady
B.in pulsation
C.continuous
D.large
A.propeller
B.impeller
C.circumference
D.screw
A.kg
B.MPa
C.meter fluid column
D.None of the above is true
最新試題
One cause of high head pressure occurring in a refrigeration system can be （）.
If the relief valve on the discharge side of a hydraulic pump lifts, the cause could be （）.
When the steering gear is in operation, you should （）.
If the suction pressure at the refrigeration compressor is below normal, the cause can be（）.
If the viscosity of the liquid being transferred remains constant as the discharge pressure increases, the rotary pump （）.
A grease gun is generally used to lubricate a （）.
Low compressor head pressure in a refrigeration system can be caused by（）.
Which of the problems listed would came the discharge temperature of an R-12 refrigeration compressor to increase?（）
Which of the following problems could cause the high pressure cutout switch to shut down the compressor in a refrigeration system?（）
The amount of fluid friction or internal friction inherent in a mineral lubricating oil is reflected as a measure of its （）.