Refrigeration Online Quiz - Set 01

Refrigeration and Air-Conditioning Online Quiz: Set 01


1. The temperature rise, between the condenser outlet and expansion valve in ammonia vapour compression system, should be as low as possible.
Yes
No

2. During sub-cooling, sensible heat from a liquid refrigerant is removed.
Yes
No

3. The expression [Pv (Pb - Pd)/ Pd (Pb - Pv)] is used for calculating relative humidity.
Yes
No

4. The final relative humidity of the air during cooling and dehumidification is generally __________ than that of entering air.
Lower
Higher

5. In a pressure enthalpy chart, the space between the saturated liquid line and saturated vapour line represents sub-cooled liquid region.
True
False

6. R-11 has the highest critical point temperature.
Correct
Incorrect

7. The mass of water vapour present in 1 kg of dry air, is called humidity ratio.
True
False

8. When the discharge pressure is too high in a refrigeration system, high pressure control is installed to stop the compressor.
Correct
Incorrect

9. In absorption vapour systems, the refrigerant widely used is R-12.
Correct
Incorrect

10. A Bell Coleman refrigerator working on dense air system as compared to open air system, for the same range of temperature, results in higher coefficient of performance.
Agree
Disagree

11. Dew point temperature is the temperature of air recorded by a thermometer, when the moisture present in it begins to condense.
Correct
Incorrect

12. If the condenser temperature is kept constant, the coefficient of performance of a refrigeration cycle increases with the increase in evaporator temperature.
Yes
No

13. The relative humidity ________ as air gets drier.
Increases
Decreases

14. The coefficient of performance (C.O.P.) is the reciprocal of the efficiency of a heat engine.
True
False

15. The coefficient of performance of vapour compression refrigeration system is quite ________ as compared to air refrigeration system.
Low
High

16. During sensible cooling of air, the relative humidity increases.
Yes
No

17. The heating of air, without any change in its specific humidity, is known as sensible heating.
True
False

18. The absolute humidity is the mass of water vapour present in 1 m3 of dry air.
Agree
Disagree

19. A condenser is used in the _________ pressure side of a refrigerating system.
Low
High

20. R-12 has the ________ freezing point.
Lowest
Highest

     Score =

Correct answers:

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