A.kg
B.MPa
C.meter fluid column
D.None of the above is true
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A.reciprocating pumps
B.positive displacement pumps
C.centrifugal pumps
D.centripetal pumps
A.depending on
B.in relative to
C.regardless of
D.because of
A.variable stroke pumps
B.multistage pumps
C.positive displacement pumps
D.triple-ported pumps
A.positive displacement
B.ejector
C.centrifugal
D.air compressor
A.reciprocating pump
B.positive displacement pump
C.centrifugal pump
D.centripetal pump
最新試題
An increasing head pressure in a refrigeration system, without any corresponding change in the cooling water inlet temperature, would probably be caused by （）.
The rate of heat transfer between the hot and cold fluids passing through a shell-and-tube type heat exchanger will （）.
A pressure drop through the refrigerant liquid line may cause （）.
The major source of chemical contaminants in hydraulic fluid is （）.
If the head pressure of a reciprocating refrigeration compressor is excessive, （）.
The output volume of a positive fixed displacement pump can be changed only by （）.
Which of the following problems could cause the high pressure cutout switch to shut down the compressor in a refrigeration system?（）
Which of the listed pumps is NOT a positive displacement pump?（）
Who is responsible for ensuring that someone is assigned to close the watertight doors in an emergency?（）
If the suction pressure at the refrigeration compressor is below normal, the cause can be（）.