题目内容

In a compression refrigeration plant, the refrigerant is under low pressure in theunder high pressure in the( )

A. compressor; condenser
B. condenser; evaporator
C. throttle valve; evaporator
D. evaporator; condenser

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Which of the following terms could best describe the temperature at which a liquid boils atgiven pressure?( )

A. Degree of saturation.
B. Saturation temperature.
C. Superheated temperature.
Degree of superheat.

The compressor suction line conveys the refrigerant vapor from( )to( )

A. condenser; evaporator
B. evaporator; compressor
C. compressor; condenser
D. compressor ; receiver

The equation "energy in = energy out" is a simple way of stating the principle of the( )

A. conservation of energy
B. conservation of matter
C. conversion of matter to energy
D. conversion of energy to matter

As to Freon refrigeration system, when the heat load begins to increase, the needle valve of an expansion valve will( )

A. move in an opening direction
B. move in a closing direction
C. either open or close
D. not move at all

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