A.In order for a fluid to be pumped, a fluid must be made to flow
B.A substance must be cold in order for it to be pumped
C.The kinetic energy imparted by the pump can be used to force a liquid through a hydraulic system
D.A pump must receive its energy from an external source
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A.one size smaller than the pump suction nozzle
B.the same size as the pump suction nozzle
C.one size larger than the pump suction nozzle
D.installed with a short radius elbow at the pump
A.first stage flash chamber
B.second stage flash chamber
C.first stage after condenser
D.second stage distilling condenser
A.system is low on refrigerant
B.high pressure cutout switch is improperly adjusted
C.discharge valves are leaking slightly
D.discharge valves are leaking excessively
A.leaky discharge valves on the LP cylinder
B.leaky discharge valves on the HP cylinder
C.insufficient intercooler cooling
D.low ambient air pressure
A.one size larger than the pump discharge nozzle
B.the same size as the pump discharge nozzle
C.one size smaller than the pump discharge nozzle
D.installed with a short radius elbow at the pump
最新試題
An internal bypass is provided on some hydraulic system suction strainers to help reduce the possibility of （）.
An increasing head pressure in a refrigeration system, without any corresponding change in the cooling water inlet temperature, would probably be caused by （）.
A grease gun is generally used to lubricate a （）.
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?（）
The control mode in which the final control element is moved from one of two flexed positions to the other is known as （）.
One cause of high head pressure occurring in a refrigeration system can be （）.
If the relief valve on the discharge side of a hydraulic pump lifts, the cause could be （）.
Which of the following problems could cause the high pressure cutout switch to shut down the compressor in a refrigeration system?（）
Who is responsible for ensuring that someone is assigned to close the watertight doors in an emergency?（）
Thermostatic expansion valves can be adjusted for （）.