204) The cooling system used for supersonic aircrafts and rockets is

simple air cooling system

boot-strap air cooling system

reduced ambient air cooling system

regenerative air cooling system

Answer is:

regenerative air cooling system

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Related Heat Transfer Refrigeration and Air Conditioning MCQ with Answers

205) Which of the following statement is correct?

In vapour absorption refrigerator, the compression of refrigerent is avoided.

Sub-cooling can be achieved by circulating more quantity of cooling water through the condenser.

In vapour compression refrigeration, the vapour is drawn in the compressor cylinder during its suction stroke and is compressed adiabatically during the compression stroke.

all of the above

Answer is:

all of the above

206) The desirable property of a refrigerant is

low boiling point

high critical temperature

high latent heat of vaporisation

all of these

Answer is:

all of these

Explanation:

The desirable property of a refrigerant is
* low boiling point
* high critical temperature
* high latent heat of vaporisation

207) The humidification process, on the psychrometric chart is shown by

horizontal line

vertical line

inclined line

curved line

Answer is:

vertical line

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

bright green

yellow

red

orange

Answer is:

bright green

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