A.warping head
B.fairlead
C.wildcat
D.capstan
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A.system was overcharged with refrigerant
B.high pressure switch was improperly adjusted
C.expansion valve strainers were fouled
D.suction valves were leaking slightly
A.increased pump speed
B.excessive pump discharge pressure
C.too low of a tilting box angle
D.low pump speed
A.Lube oil passing through the system
B.Moisture or foreign matter collecting at the valve seat and orifice
C.Variable spring tension caused by the changing temperature
D.Frost on the liquid line
A.an immediate crankcase explosion
B.oil contamination in the compressed air
C.a decrease in compressor capacity
D.no immediate loss of the compressed air capacity
A.The density of the air entering the compressor
B.The temperature of the air entering the compressor
C.The designed rotating speed of the compressor
D.A leaking head gasket
最新試題
A salinity indicator is used to determine the （）.
One cause of high head pressure occurring in a refrigeration system can be （）.
The control mode in which the final control element is moved from one of two flexed positions to the other is known as （）.
Thermostatic expansion valves can be adjusted for （）.
Pitting in the suction areas of a centrifugal pump bronze impeller is usually caused by （）.
A pressure drop through the refrigerant liquid line may cause （）.
A grease gun is generally used to lubricate a （）.
The usual symptoms of cavitation in a centrifugal pump is （）.
Which of the listed pumps is NOT a positive displacement pump?（）
The amount of fluid friction or internal friction inherent in a mineral lubricating oil is reflected as a measure of its （）.