A.should be paved
B.should be cleaned
C.should be dismantled
D.should be welded
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A.fulfill
B.eliminate
C.grease
D.bend
A.Condenser and thermal expansion valve
B.King and solenoid valves
C.Compressor and thermal expansion valve
D.Condenser and solenoid valve
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）
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An internal bypass is provided on some hydraulic system suction strainers to help reduce the possibility of （）.
Which of the following problems could cause the high pressure cutout switch to shut down the compressor in a refrigeration system?（）
The usual symptoms of cavitation in a centrifugal pump is （）.
A salinity indicator is used to determine the （）.
If the relief valve on the discharge side of a hydraulic pump lifts, the cause could be （）.
When the steering gear is in operation, you should （）.
Which of the following statements is correct concerning heat transfer?（）
A salinity indicator is used to determine the （）.
If the head pressure of a reciprocating refrigeration compressor is excessive, （）.
Heavy wear in a particular area of the inner circumference of a packing ring may be caused by （）.