Mechanical Engineering - Heat Transfer, Refrigeration and Air Conditioning

11. 

In a reversed Brayton cycle, the heat is absorbed by the air during

A. isentropic compression process
B. constant pressure cooling process
C. isentropic expansion process
D. constant pressure expansion process

Answer: Option D

Explanation:

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12. 

Wet bulb temperature is the temperature of air recorded by a thermometer, when

A. it is not effected by the moisture present in the air
B. its bulb is surrounded by a wet cloth exposed to the air
C. the moisture present in it begins to condense
D. none of the above

Answer: Option B

Explanation:

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13. 

A device used for transfering heat from one fluid to another is called heat exchanger.

A. True
B. False

Answer: Option A

Explanation:

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14. 

The coefficient of performance (C.O.P.) of a refrigerator working as a heat pump is given by

A. (C.O.P.)P = (C.O.P.)R + 2
B. (C.O.P.)P = (C.O.P.)R + 1
C. (C.O.P)P = (C.O.P)R - 1
D. (C.O.P)P = (C.O.P)R

Answer: Option B

Explanation:

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15. 

The temperature below which a gas is always liquified, is known as critical temperature.

A. Correct
B. Incorrect

Answer: Option B

Explanation:

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