A.Condenser and thermal expansion valve
B.King and solenoid valves
C.Compressor and thermal expansion valve
D.Condenser and solenoid valve
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A.Too much refrigerant
B.Too little refrigerant
C.Refrigerant is ran out
D.Running is over
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
最新試題
The major source of chemical contaminants in hydraulic fluid is （）.
Thermostatic expansion valves can be adjusted for （）.
When the steering gear is in operation, you should （）.
A grease gun is generally used to lubricate a （）.
On tank vessels equipped with power operated cargo tank valves, the type of power operator most commonly used is （）.
A salinity indicator is used to determine the （）.
An excessive charge of refrigerant in an air-cooled refrigeration system can cause （）.
The amount of fluid friction or internal friction inherent in a mineral lubricating oil is reflected as a measure of its （）.
Which of the problems listed would came the discharge temperature of an R-12 refrigeration compressor to increase?（）
One cause of high head pressure occurring in a refrigeration system can be （）.