單項(xiàng)選擇題Short cycling of a refrigeration compressor refers to （）.

A.frequently grounding out
B.frequently starting and stopping
C.running too fast
D.running too slow


您可能感興趣的試卷

你可能感興趣的試題

1.單項(xiàng)選擇題When a flash-type evaporator is to be secured for an extended period of time, the entire unit should be drained, cleaned, and （）.

A.completely filled with saltwater
B.filled with de-scaling compound
C.tightly closed to exclude air
D.vented to the atmosphere

2.單項(xiàng)選擇題Condensate must be drained periodically from the air compressor receivers to prevent （）.

A.second stage cylinder lockup
B.oil sump contamination
C.faulty operation of pneumatic valves
D.corrosion of air receiver baffles

3.單項(xiàng)選擇題Overheating of a hydraulic system may be a result of （）.

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

4.單項(xiàng)選擇題The purpose of the low pressure cut-out switch is to （）.

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

5.單項(xiàng)選擇題The process of boiling seawater in order to separate it into freshwater vapor and brine is usually defined as （）.

A.dehydration
B.condensation
C.evaporation
D.dissolution