Mechanical Engineering - Heat Transfer, Refrigeration and Air Conditioning

46. 

The critical radius is the insulation radius at which the resistance to heat flow is

A. maximum
B. minimum
C. zero
D. none of these

Answer: Option B

Explanation:

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47. 

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

A. Correct
B. Incorrect

Answer: Option B

Explanation:

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48. 

A water cooled condenser operates at a __________ condensing temperature than an air-cooled condenser.

A. higher
B. lower

Answer: Option B

Explanation:

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49. 

The relative humidity decreases as air gets wet.

A. True
B. False

Answer: Option A

Explanation:

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50. 

The temperature of ammonia after compression in a vapour compression system is

A. 20 to 50° C
B. 50 to 70° C
C. 70 to 110° C
D. none of these

Answer: Option C

Explanation:

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