A.vaporizes in the condenser
B.reaches the compressor through the suction line
C.flashes in the liquid line
D.condenses in the receiver
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A.heat
B.power
C.horsepower
D.foot-pound
A.worn bearings and piston pins
B.slugging due to flooding back
C.too much oil in circulation
D.All of the above
A.superheated
B.super-cooled
C.at or below the dew point
D.All of the above
A.open the steam line mot valve
B.drain the steam cylinder
C.close the steam cylinder drains
D.open the liquid cylinder drains
A.rudder will respond sluggishly
B.hydraulic rams will over-speed
C.sight glass will show bubbles
D.ram relief valves will lift
A.continuous running of the compressor
B.high suction pressure
C.high discharge pressure
D.short cycling of the compressor on the water failure switch
A.the cooling effect of the condensate reduces the compressors efficiency
B.a danger of explosion exists whenever water is present in a compressor
C.water causes erratic operation of pneumatic components
D.the volumetric capacity of the first stage is reduced if water remains
A.the compressor short cycling on high pressure cut out switch
B.high suction pressure
C.high head pressure
D.bubbles in the sight glass
A.The two objects must be in physical contact
B.The two objects must be the same size
C.There must be an existing temperature differential
D.There must be an existing weight differential
A.insufficient lubrication
B.insufficient refrigerant
C.excess refrigerant
D.excessive opening of the expansion valve
最新试题
One cause of high head pressure occurring in a refrigeration system can be ().
An increasing head pressure in a refrigeration system, without any corresponding change in the cooling water inlet temperature, would probably be caused by ().
A grease gun is generally used to lubricate a ().
Which of the listed pumps is NOT a positive displacement pump?()
The rate of heat transfer from a hot region to a cold region is affected most by the ().
If the suction pressure at the refrigeration compressor is below normal, the cause can be().
If the head pressure of a reciprocating refrigeration compressor is excessive, ().
An internal bypass is provided on some hydraulic system suction strainers to help reduce the possibility of ().
The output volume of a positive fixed displacement pump can be changed only by ().
Which of the following problems could cause the high pressure cutout switch to shut down the compressor in a refrigeration system?()