A.dirt will cause corrosion of bearing
B.bearings will leak oil excessively
C.dirt is very abrasive when mixed with grease
D.grease will become inflammable
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A.promote refrigerant dehydration
B.be absorbed in the receiver
C.cause low condensing pressure
D.carry moisture and lead to corrosion
A.frosting of the liquid line
B.higher than normal head pressure
C.a clear sight glass
D.abnormally cold reefer boxes
A.The hose should not be twisted
B.The hose should be protected with a sleeve if it is subjected to rubbing
C.There should be some slack in the hose
D.All of the above
A.acid
B.fuel oil
C.sediment
D.water
A.Main circulator pump jacket water cooling
B.Salt water service pump
C.Auxiliary condensate pump
D.Bilge pump
最新試題
Which of the listed pumps is NOT a positive displacement pump?（）
Who is responsible for ensuring that someone is assigned to close the watertight doors in an emergency?（）
If the viscosity of the liquid being transferred remains constant as the discharge pressure increases, the rotary pump （）.
When a refrigeration compressor has developed a high head pressure as a result of a refrigerant overcharge, you should （）.
A pressure drop through the refrigerant liquid line may cause （）.
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?（）
If the head pressure of a reciprocating refrigeration compressor is excessive, （）.
If the suction pressure at the refrigeration compressor is below normal, the cause can be（）.
A gradual decrease in the discharge pressure of an operating hydraulic pump can be caused by （）.
The usual symptoms of cavitation in a centrifugal pump is （）.