A.non-pulsating
B.pulsating
C.positive
D.non-positive
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A.injection valve
B.relief valve
C.discharge valve
D.inlet filter
A.gear
B.vane
C.screw
D.centrifugal
A.low pressure
B.low discharge
C.low speed
D.high pressure
A.positive displacement
B.non-positive displacement
C.mixed-flow
D.axial-flow
A.Reciprocating pumps
B.Rotary pumps
C.Centrifugal pumps
D.Gear pumps
最新試題
If the thermal bulb of an expansion valve is incorrectly placed at the center of the coil instead of the end, it will （）.
Low compressor head pressure in a refrigeration system can be caused by（）.
The rate of heat transfer from a hot region to a cold region is affected most by the （）.
On tank vessels equipped with power operated cargo tank valves, the type of power operator most commonly used is （）.
A gradual decrease in the discharge pressure of an operating hydraulic pump can be caused by （）.
When the steering gear is in operation, you should （）.
One cause of high head pressure occurring in a refrigeration system can be （）.
Which of the listed pumps is NOT a positive displacement pump?（）
The usual symptoms of cavitation in a centrifugal pump is （）.
The amount of fluid friction or internal friction inherent in a mineral lubricating oil is reflected as a measure of its （）.