# Mechanical Engineering - Heat Transfer, Refrigeration and Air Conditioning

### Exercise :: Heat Transfer, Refrigeration and Air Conditioning - Section 6

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

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

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

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

Explanation:

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15.

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

 A. Correct B. Incorrect