A.Impeller
B.Electric motor
C.Volute
D.Eye
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A.carbon deposits on the compressor suction valves
B.the evaporator temperature to increase
C.rapid corrosion of the thermal expansion valve
D.no operating problems
A.increases brine density
B.increases distillate salinity
C.reduces metal corrosion
D.reduces heat transfer
A.positive head
B.negative suction head
C.mechanical seal
D.vent valve attached to the casing at the top of the volute
A.gate valve
B.globe valve
C.check valve
D.plug cock
A.At the designed operating temperature, the liquid refrigerant charge has changed to a vapor
B.The liquid refrigerant tends to collect at the bellows or diaphragm and reduces the valve sensitivity
C.The sensing bulb is empty of liquid refrigerant charge at the designed operating temperature
D.The sensing bulb is never emptied of liquid refrigerant under normal operating conditions
最新試題
When a refrigeration compressor has developed a high head pressure as a result of a refrigerant overcharge, you should （）.
When the steering gear is in operation, you should （）.
The control mode in which the final control element is moved from one of two flexed positions to the other is known as （）.
If the viscosity of the liquid being transferred remains constant as the discharge pressure increases, the rotary pump （）.
Which of the following statements is correct concerning heat transfer?（）
The rate of heat transfer between the hot and cold fluids passing through a shell-and-tube type heat exchanger will （）.
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?（）
A gradual decrease in the discharge pressure of an operating hydraulic pump can be caused by （）.
An increasing head pressure in a refrigeration system, without any corresponding change in the cooling water inlet temperature, would probably be caused by （）.
If the relief valve on the discharge side of a hydraulic pump lifts, the cause could be （）.