A.steady
B.in pulsation
C.continuous
D.large
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A.propeller
B.impeller
C.circumference
D.screw
A.kg
B.MPa
C.meter fluid column
D.None of the above is true
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
最新試題
The major source of chemical contaminants in hydraulic fluid is （）.
The general purpose of a heat exchanger is to （）.
The control mode in which the final control element is moved from one of two flexed positions to the other is known as （）.
A gradual decrease in the discharge pressure of an operating hydraulic pump can be caused by （）.
Thermostatic expansion valves can be adjusted for （）.
Heavy wear in a particular area of the inner circumference of a packing ring may 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 grease gun is generally used to lubricate a （）.
One cause of high head pressure occurring in a refrigeration system can be （）.
Low compressor head pressure in a refrigeration system can be caused by（）.