單項選擇題Hot gas bypass is one of the methods used to （）

A.relieve excessive compressor head pressure
B.produce flash gas at the expansion valve
C.reduce flooding of the receiver at low load
D.defrost the evaporator coils


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1.單項選擇題Thermostatic expansion valves can be adjusted for （）

A.suction pressure only
B.head pressure only
C.superheat only
D.suction pressure and box temperature

2.單項選擇題The receiver used in a refrigeration system（）

A.stores liquid refrigerant
B.collects non-condensable gases
C.allows refrigerant sub-cooling
D.prevents compressor surging

3.單項選擇題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

4.單項選擇題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

5.單項選擇題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