A.reciprocating pump
B.positive displacement pump
C.centrifugal pump
D.centripetal pump
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A.noise and vibration
B.an increase in discharge pressure
C.an increase in suction pressure
D.lifting of the relief valve
A.dead band action
B.neutral zone action
C.range
D.on-off action
A.hydraulic
B.electric
C.steam
D.diesel
A.oil foaming in the compressor
B.higher than normal suction and discharge pressures with a higher box temperature
C.higher than normal discharge pressure with a normal box temperature
D.the compressor to run continuously
A.suction pressure only
B.head pressure only
C.superheat only
D.suction pressure and box temperature
A.restriction in refrigerant piping
B.air and non-condensable gases in the condenser
C.water in the refrigerant
D.flooding back of liquid refrigerant from the evaporator
A.solenoid valve to seize
B.compressor to hunt
C.formation of flash gas in the liquid line
D.expansion valve to freeze open
A.aeration of the oil
B.contamination of the oil
C.pump cavitation
D.spongy actuator movements
A.specific gravity
B.viscosity
C.S E number
D.hydrolytic stability
A.Centrifugal
B.Reciprocating
C.Gear
D.Rotary
最新試題
If the suction pressure at the refrigeration compressor is below normal, the cause can be（）.
Who is responsible for ensuring that someone is assigned to close the watertight doors in an emergency?（）
Which of the following problems could cause the high pressure cutout switch to shut down the compressor in a refrigeration system?（）
The rate of heat transfer between the hot and cold fluids passing through a shell-and-tube type heat exchanger will （）.
The control mode in which the final control element is moved from one of two flexed positions to the other is known as （）.
An increasing head pressure in a refrigeration system, without any corresponding change in the cooling water inlet temperature, would probably be caused by （）.
The major source of chemical contaminants in hydraulic fluid is （）.
Which of the listed pumps is NOT a positive displacement pump?（）
When the steering gear is in operation, you should （）.
Thermostatic expansion valves can be adjusted for （）.