A.frequently grounding out
B.frequently starting and stopping
C.running too fast
D.running too slow
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A.completely filled with saltwater
B.filled with de-scaling compound
C.tightly closed to exclude air
D.vented to the atmosphere
A.second stage cylinder lockup
B.oil sump contamination
C.faulty operation of pneumatic valves
D.corrosion of air receiver baffles
A.changing pump discharge pressure in response to normal load variations
B.a high oil level
C.incorrect fluid viscosity
D.continued slow re-circulation of the oil
A.maintain liquid refrigerant at the suction of the compressor
B.maintain a preset suction pressure to the compressor
C.start and stop the compressor at preset operating pressures
D.operate at minimum efficiency
A.dehydration
B.condensation
C.evaporation
D.dissolution
最新試題
When a refrigeration compressor has developed a high head pressure as a result of a refrigerant overcharge, you should （）.
An excessive charge of refrigerant in an air-cooled refrigeration system can cause （）.
The control mode in which the final control element is moved from one of two flexed positions to the other is known as （）.
Heavy wear in a particular area of the inner circumference of a packing ring may be caused by （）.
The usual symptoms of cavitation in a centrifugal pump is （）.
Who is responsible for ensuring that someone is assigned to close the watertight doors in an emergency?（）
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 （）.
Thermostatic expansion valves can be adjusted for （）.
Which of the problems listed would came the discharge temperature of an R-12 refrigeration compressor to increase?（）