单项选择题

The purpose of the refrigeration system low pressure cutout switch is to （）

A.protect the compressor from liquid flood back
B.protect the compressor from low discharge pressure
C.start and stop the compressor upon system demand
D.start the compressor after a drop in the evaporator pressure

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单项选择题

A pressure drop in the liquid line of a refrigeration system may cause（）

A.the solenoid valve to seize
B.the compressor to hunt
C.flash gas to form in the liquid line
D.the expansion valve to freeze open

单项选择题

In a direct expansion type multi-box refrigeration system, the compressor is set up to cycle on and off by the（）

A.pressurestat
B.high pressure cutout
C.solenoid valve
D.low pressure cutout switch

单项选择题

The pressure range between the system cut in and cut out pressures in a refrigeration unit is known as（）

A.opposing operational drag
B.pressure distribution
C.differential
D.system purge