A.Compound gage
B.Bonrdon tube
C.Manometer
D.Deadweight gage
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A.cavitation
B.water hammer
C.fluid friction
D.steam knock
A.sub-cooled liquid
B.high temperature liquid
C.oil saturated liquid
D.superheated vapor
A.Reciprocating
B.Centrifugal
C.Rotary
D.Gear
A.change in the impeller diameter
B.square of the impeller radius
C.cube of the impeller diameter
D.impeller efficiency for large changes in its size
A.As pressure decreases, volume increases
B.As volume increases, pressure increases
C.As volume decreases, pressure decreases
D.As pressure increases, volume increases
A.readjust the relief valve
B.throttle the suction line
C.throttle the discharge valve
D.open the priming line
A.transmitter at the steering station and a receiver at the steering engine
B.reversible motor at the steering station geared to the steering pumps
C.small induction motor on the bridge which controls the redder through pulleys
D.variable displacement hydraulic pump driven by a reversible DC motor
A.Distiller air ejector cooling medium
B.Saltwater heater discharge
C.First-stage internal feed box
D.Second-stage internal feed box
A.condenser
B.vapor generator
C.accumulator
D.evaporator
A.expansion valve to the compressor
B.receiver to the expansion coil
C.expansion valve to the evaporator
D.condenser to the expansion valve
最新试题
The output volume of a positive fixed displacement pump can be changed only by ().
The usual symptoms of cavitation in a centrifugal pump is ().
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 ().
If the suction pressure at the refrigeration compressor is below normal, the cause can be().
If the thermal bulb of an expansion valve is incorrectly placed at the center of the coil instead of the end, it will ().
When a refrigeration compressor has developed a high head pressure as a result of a refrigerant overcharge, you should ().
One cause of high head pressure occurring in a refrigeration system can be ().
Which of the following problems could cause the high pressure cutout switch to shut down the compressor in a refrigeration system?()
When the steering gear is in operation, you should ().