A.contaminated fluid
B.pitted thrust rings
C.worn pintle bearings
D.obstructed suctions passage
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A.shaft and impeller
B.motor and pump shaft
C.casing and impeller wearing rings
D.lantern ring and impeller
A.central valve
B.radial plunger
C.floating ring
D.cylinder body
A.moisturizing
B.dehumidification
C.dampening
D.humidification
A.compressor is overloaded
B.motor is overloaded
C.foundation bolts are loose
D.belts are too tight
A.rapidly
B.by gravity
C.through a standard orifice at a specified temperature
D.at a rate of 60cc per second
最新試題
A grease gun is generally used to lubricate a （）.
Which of the problems listed would came the discharge temperature of an R-12 refrigeration compressor to increase?（）
A salinity indicator is used to determine the （）.
One cause of high head pressure occurring in a refrigeration system can be （）.
If the head pressure of a reciprocating refrigeration compressor is excessive, （）.
If the relief valve on the discharge side of a hydraulic pump lifts, the cause could be （）.
An increasing head pressure in a refrigeration system, without any corresponding change in the cooling water inlet temperature, would probably be caused by （）.
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 suction pressure at the refrigeration compressor is below normal, the cause can be（）.
A pressure drop through the refrigerant liquid line may cause （）.