Mechanical Engineering - Heat Transfer, Refrigeration and Air Conditioning

26. 

During heating and humidification, the final relative humidity of air

A. is higher than that of the entering air
B. is lower than that of the entering air
C. can be lower or higher than that of the entering air
D. none of the above

Answer: Option C

Explanation:

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27. 

The fluids used in electrolux refrigerator are

A. water and hydrogen
B. ammonia and hydrogen
C. ammonia, water and hydrogen
D. none of these

Answer: Option C

Explanation:

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28. 

The process of undercooling is generally brought about by

A. circulating more quantity of cooling water through the condenser
B. using water colder than the main circulating water
C. employing a heat exchanger
D. any one of the above

Answer: Option D

Explanation:

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29. 

The refrigerant after condensation process is cooled below the saturation temperature before throttling. Such a process is called

A. sub-cooling or under-cooling
B. super-cooling
C. normal cooling
D. none of these

Answer: Option A

Explanation:

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30. 

R-12 has the __________ freezing point.

A. lowest
B. highest

Answer: Option A

Explanation:

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