Refrigeration and Air-Conditioning Online Quiz - Set 02

Refrigeration and Air-Conditioning Online Quiz: Set 02


1. The sensible heat gain is due to the _________ difference between the fresh air and the air in space.
Temperature
Humidity

2. Dew point temperature corresponds to the saturation temperature of vapour at its partial pressure.
True
False

3. If the evaporator temperature is kept constant, the coefficient of performance of refrigeration cycle ________ with the increase in condenser temperature.
Increases
Decreases

4. The refrigerant carbon dioxide is not widely used because of its _________ power requirements per tonne of refrigeration and high operating pressures.
Low
High

5. The inclined and non-uniformly spaced straight lines on a psychrometric chart indicate wet bulb temperature.
Agree
Disagree

6. For a given dry bulb temperature, as the relative humidity ________ the wet bulb temperature will increase.
Increases
Decreases

7. In a psychrometric chart, dew point temperature lines are horizontal and non-uniformly spaced.
Correct
Incorrect

8. In a shell and coil condenser, water flows in the shell and the refrigerant in the coil.
True
False

9. The process of adding moisture to the air, without change in its dry bulb temperature, is known as humidification.
Agree
Disagree

10. The wet bulb temperature lines, on the psychrometric chart, are curved lines.
True
False

11. The highest temperature during the cycle in a vapour compression system occurs after evaporation.
True
False

12. The cooling of air, without any change in its specific humidity, is known as sensible cooling.
Correct
Incorrect

13. The freezing point of carbon dioxide is equal to boiling point of R-12.
Correct
Incorrect

14. The sulphur sticks, in case of leakage of ammonia refrigerant, gives white smoke.
True
False

15. The capacity of the cooling tower and spray ponds _________ as the wet bulb temperature of air decreases.
Increases
Decreases

16. Dehydration is the process of removing water vapour from the surrounding air.
True
False

17. During sensible heating of air, specific humidity remains constant.
Agree
Disagree

18. The ________ point of ammonia is -77.7°C.
Freezing
Boiling

19. The expansion valve in a refrigerator controls the flow of refrigerant.
Correct
Incorrect

20. A simple air cooling system is good for ________ flight speeds.
Low
High

     Score =

Correct answers:

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