# Mechanical Engineering - Heat Transfer, Refrigeration and Air Conditioning

### Exercise :: Heat Transfer, Refrigeration and Air Conditioning - Section 7

26.

In case of sensible heating of air, the coil efficiency is given by (where B.P.F. = By-pass factor)

 A. B.P.F. - 1 B. 1 - B.P.F. C. D. 1 + B.RF.

Explanation:

No answer description available for this question. Let us discuss.

27.

The coefficient of performance (C.O.P.) is the reciprocal of the efficiency of a heat engine.

 A. True B. False

Explanation:

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28.

The wet bulb temperature at 100% relative humidity is __________ dry bulb temperature.

 A. same as B. lower than C. higher than

Explanation:

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29.

The freezing point of sulphur dioxide is

 A. -56.6°C B. -75.2°C C. -77.7°C D. -135.8°C

Explanation:

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30.

The ratio of the energy absorbed by the body to the total energy falling on it, is called

 A. absorptive power B. emissive power C. emissivity D. none of these