單項(xiàng)選擇題The pressure head of a pump is given in the unit of ().

A.kg
B.MPa
C.meter fluid column
D.None of the above is true


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1.單項(xiàng)選擇題A gear pump belongs to () according to its working principle.

A.reciprocating pumps
B.positive displacement pumps
C.centrifugal pumps
D.centripetal pumps

2.單項(xiàng)選擇題Gear pumps are of positive displacement type pumps because they discharge a near constant amount of liquid () pressure.

A.depending on
B.in relative to
C.regardless of
D.because of

3.單項(xiàng)選擇題The gear and screw pumps are classified as ().

A.variable stroke pumps
B.multistage pumps
C.positive displacement pumps
D.triple-ported pumps

5.單項(xiàng)選擇題A vane pump belongs to () according to its working principle.

A.reciprocating pump
B.positive displacement pump
C.centrifugal pump
D.centripetal pump

最新試題

Which of the following problems could cause the high pressure cutout switch to shut down the compressor in a refrigeration system?()

題型:?jiǎn)雾?xiàng)選擇題

When a refrigeration compressor has developed a high head pressure as a result of a refrigerant overcharge, you should ().

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If the viscosity of the liquid being transferred remains constant as the discharge pressure increases, the rotary pump ().

題型:?jiǎn)雾?xiàng)選擇題

A gradual decrease in the discharge pressure of an operating hydraulic pump can be caused by ().

題型:?jiǎn)雾?xiàng)選擇題

Which of the problems listed would came the discharge temperature of an R-12 refrigeration compressor to increase?()

題型:?jiǎn)雾?xiàng)選擇題

One cause of high head pressure occurring in a refrigeration system can be ().

題型:?jiǎn)雾?xiàng)選擇題

The output volume of a positive fixed displacement pump can be changed only by ().

題型:?jiǎn)雾?xiàng)選擇題

A pressure drop through the refrigerant liquid line may cause ().

題型:?jiǎn)雾?xiàng)選擇題

The rate of heat transfer from a hot region to a cold region is affected most by the ().

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The temperature differential occurring between the inlet temperature of the fluid to be cooled and the outlet temperature of the cooling medium in a shell-and-tube heat exchanger is greatest in which of the flow designs listed?()

題型:?jiǎn)雾?xiàng)選擇題