A.throttling the pressure line
B.changing the speed of the rotor
C.either A or B
D.None of the above is tree
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A.reciprocating pumps
B.positive displacement pumps
C.centrifugal pumps
D.centripetal pumps
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
最新試題
The major source of chemical contaminants in hydraulic fluid is （）.
The general purpose of a heat exchanger is to （）.
If the thermal bulb of an expansion valve is incorrectly placed at the center of the coil instead of the end, it will （）.
The control mode in which the final control element is moved from one of two flexed positions to the other is known as （）.
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?（）
The amount of fluid friction or internal friction inherent in a mineral lubricating oil is reflected as a measure of its （）.
Thermostatic expansion valves can be adjusted for （）.
A gradual decrease in the discharge pressure of an operating hydraulic pump can be caused by （）.
A grease gun is generally used to lubricate a （）.
Heavy wear in a particular area of the inner circumference of a packing ring may be caused by （）.