A.3 or 5
B.5 or 7
C.7 or 9
D.9 or 11
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A.sensible heat
B.latent heat
C.total heat
D.residual heat
A.centerline of the pump and the level of the liquid in the suction well when the source of liquid is below the pump
B.centerline of the pump and the suction liquid level when the source of liquid is above the pump
C.centerline of the pump and the level of the discharge liquid
D.liquid levels of the suction and discharge
A.total heat
B.residual heat
C.specific heat
D.superheat
A.Single stage or multistage
B.High pressure or low pressure
C.Open or close coupled
D.Horizontal or vertical
A.contaminated fluid
B.pitted thrust rings
C.worn pintle bearings
D.obstructed suctions passage
最新試題
An excessive charge of refrigerant in an air-cooled refrigeration system can cause （）.
The general purpose of a heat exchanger is to （）.
An increasing head pressure in a refrigeration system, without any corresponding change in the cooling water inlet temperature, would probably be caused by （）.
Who is responsible for ensuring that someone is assigned to close the watertight doors in an emergency?（）
If the relief valve on the discharge side of a hydraulic pump lifts, the cause could be （）.
The usual symptoms of cavitation in a centrifugal pump is （）.
Which of the listed pumps is NOT a positive displacement pump?（）
The amount of fluid friction or internal friction inherent in a mineral lubricating oil is reflected as a measure of its （）.
One cause of high head pressure occurring in a refrigeration system can be （）.
Which of the following problems could cause the high pressure cutout switch to shut down the compressor in a refrigeration system?（）