A.variable stroke pumps
B.multistage pumps
C.positive displacement pumps
D.triple-ported pumps
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A.mixed-flow pump
B.axial-flow pump
C.centrifugal pump
D.displacement pump
A.on top cover
B.on sides of bowl
C.in drain line on the discs
D.on the discs
A.oil
B.sea water
C.refrigerant
D.fresh water
A.a flash generator
B.a flash evaporator
C.a vacuum boiling evaporator
D.a boiler
A.lower than
B.higher than
C.as much as
D.the same as
最新試題
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 （）.
The usual symptoms of cavitation in a centrifugal pump is （）.
Low compressor head pressure in a refrigeration system can be caused by（）.
Pitting in the suction areas of a centrifugal pump bronze impeller is usually caused by （）.
When the steering gear is in operation, you should （）.
A salinity indicator is used to determine the （）.
A pressure drop through the refrigerant liquid line may cause （）.
The control mode in which the final control element is moved from one of two flexed positions to the other is known as （）.
When a refrigeration compressor has developed a high head pressure as a result of a refrigerant overcharge, you should （）.