超星 - 第18周的课堂练习 - 查题吧

单选题

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

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

单选题

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

单选题

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

单选题

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

单选题

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

单选题

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

单选题

( )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

单选题

The saturation temperature changes with( )

A. the air density
B. the pressure
C. the present atmospheric pressure
D. surrounding temperature

单选题

The most infamous greenhouse gas is( )

A. CO2.
B. R134
C. NH.
D. R22

单选题

( )is the process of removing heat, and the practical application is to produce or maintaintemperatures below the ambient.

A. Refrigeration
B. Ventilation
Circulation
D. Evaporation

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