Refrigeration and air conditioning CO5

Which of the following can be considered as a refrigeration cycle?

• Carnot cycle

• Reversed Carnot cycle

• Reversed heat engine cycle

• Air standard cycle

The ideal process occurring in the expansion device of vapor compression refrigeration cycle is ____.

• adiabatic heat rejection

• adiabatic throttling

• constant pressure throttling

• all the above

Which of the following device produces the refrigerating effect?

• compressor

• condenser

• expansion valve

• evaporator

The enthalpy of the refrigerant after ideal expansion is equal to _____.

• h_f at condenser pressure

• h_g at condenser pressure

• h_f at evaporator pressure

• h_g at evaporator pressure

Which of the following fluid is not used as refrigerant?

• Ammonia

• Freon

• Sulphur dioxide

• None of the above

Vapour absorption refrigeration cycle uses _____ instead of _____.

• absorber, compressor

• generator, compressor

• heat exchanger, compressor

• absorber-generator assembly, compressor

(a)   is the study of the properties of air-water vapor mixture.

The temperature at which water vapor in the air starts to condense is called____.

• Condensation temperature

• Saturation temperature

• dew point temperature

• all the above

The mass of water vapor per unit mass of dry air in a mixture of air-water vapor is called

• Specific humidity

• Relative humidity

• Humidity ratio

• all the above

On a day when the difference between the dry bulb temperature and the wet bulb temperature is large, then the amount of moisture present in air is _____.

• zero

• less

• more

• none of the above