Mechanical Engineering - Heat Transfer, Refrigeration and Air Conditioning

21. 

The cooling system used for supersonic aircrafts and rockets is

A. simple air cooling system
B. boot-strap air cooling system
C. reduced ambient air cooling system
D. regenerative air cooling system

Answer: Option D

Explanation:

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22. 

Which of the following statement is correct?

A. In vapour absorption refrigerator, the compression of refrigerent is avoided.
B. Sub-cooling can be achieved by circulating more quantity of cooling water through the condenser.
C. In vapour compression refrigeration, the vapour is drawn in the compressor cylinder during its suction stroke and is compressed adiabatically during the compression stroke.
D. all of the above

Answer: Option D

Explanation:

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23. 

The desirable property of a refrigerant is

A. low boiling point
B. high critical temperature
C. high latent heat of vaporisation
D. all of these

Answer: Option D

Explanation:

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24. 

The humidification process, on the psychrometric chart is shown by

A. horizontal line
B. vertical line
C. inclined line
D. curved line

Answer: Option B

Explanation:

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25. 

The colour of the flame of halide torch, in case of leakage of freon refrigerant, will change to

A. bright green
B. yellow
C. red
D. orange

Answer: Option A

Explanation:

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