题目内容

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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If there is no change of temperature but a change of state ( solid to liquid, liquid to gas, or viceversa) it is called( ) heat.

A. latent
B. sensible
C. surplus
D. waste

The basic( )cycle makes use of the boiling and condensing of a working fluid at differenttemperatures and, therefore, at different pressures.

A. refrigeration
B. compression
C. propulsion
D. evaporation

A liquid boils and condenses-the change between the liquid and gaseous states -- at a temperature which depends on its( ), within the limits of its freezing point and critical temperature.

A. dew point
B. flow
C. boiling point
D. pressure

( )regulates the refrigerant flows from the high pressure side of the system to the lowpressure side.

A. Condenser
B. The expansion valve
C. Evaporator
D. Compressor