单项选择题

Sub-cooling is a method of reducing the temperature of the liquid refrigerant below its （）.

A.freezing point
B.floc point
C.condensing temperature
D.compression temperature

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单项选择题

If a bilge pump is able to develop vacuum, but is unable to sufficiently pump out the bilges, you would check for all of the following EXCEPT （）.

A.the circuit breaker
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单项选择题

The principal purpose of sub-cooling liquid refrigerant prior to its entering the expansion valve is to （）.

A.increase the refrigerating effect, by decreasing the amount of flash gas
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单项选择题

Refrigerant is normally sub-cooled in a refrigeration or air conditioning system condenser to （）.

A.maintain adequate coil back pressure
B.prohibit flashing in the liquid line
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D.reduce compressor discharge line loading