A.Too much refrigerant
B.Too little refrigerant
C.Refrigerant is ran out
D.Running is over
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A.increase
B.reduce
C.maintain constant
D.None of the above is true
Which of the following may cause that excessively warm water leaves the condenser in a refrigeration plant? （）
(1) too little cooling water
(2) too much cooling water
(3) too warm cooler water
A.（1）only
B.anyof（1），（2）and（3）
C.anyof（1）and（3）
D.anyof（1）and（2）
Which of the following may cause that the compressor cuts off on high pressure cutout in a refrigeration plant? （）
(1) faulty condensing
(2) too few refrigerant
(3) high discharge pressure
A.any of (1) and (3)
B.any of (1) and (2)
C.any of (2) and (3)
D.any of (1), (2) and (3)
A.cutout
B.controller switch
C.pressure controller
D.cutout switch
A.evaporator
B.compressor
C.condenser
D.none of the above
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An increasing head pressure in a refrigeration system, without any corresponding change in the cooling water inlet temperature, would probably be caused by （）.
The general purpose of a heat exchanger is to （）.
A pressure drop through the refrigerant liquid line may cause （）.
Low compressor head pressure in a refrigeration system can be caused by（）.
The usual symptoms of cavitation in a centrifugal pump is （）.
Which of the following statements is correct concerning heat transfer?（）
Who is responsible for ensuring that someone is assigned to close the watertight doors in an emergency?（）
A grease gun is generally used to lubricate a （）.
The rate of heat transfer from a hot region to a cold region is affected most by the （）.
Which of the problems listed would came the discharge temperature of an R-12 refrigeration compressor to increase?（）