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Heat Transfer, Refrigeration and Air Conditioning

21.

Thermal conductivity of air increases with rise in temperature.

Answer: A

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Answer: D

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23.

The wet bulb temperature during sensible heating of air

Answer: B

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24.

In case of solids, the heat transfer takes place according to radiation.

Answer: B

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25.

A vapour absorption refrigerator uses __________ as a refrigerant.

Answer: D

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Answer: D

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27.

The minimum temperature to which water can be cooled in a cooling tower is

Answer: B

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Answer: A

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29.

Defrosting of a refrigerator may be done by stopping the compressor for a short period.

Answer: A

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30.

The horizontal and uniformly spaced lines on a psychrometric chart indicates relative humidity

Answer: B

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