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
Which of the listed pumps is NOT a positive displacement pump?（）
Which of the following statements is correct concerning heat transfer?（）
An excessive charge of refrigerant in an air-cooled refrigeration system can cause （）.
On tank vessels equipped with power operated cargo tank valves, the type of power operator most commonly used is （）.
When the steering gear is in operation, you should （）.
The amount of fluid friction or internal friction inherent in a mineral lubricating oil is reflected as a measure of its （）.
The control mode in which the final control element is moved from one of two flexed positions to the other is known as （）.
If the viscosity of the liquid being transferred remains constant as the discharge pressure increases, the rotary pump （）.
Low compressor head pressure in a refrigeration system can be caused by（）.
Which of the following problems could cause the high pressure cutout switch to shut down the compressor in a refrigeration system?（）