Mechanical Engineering - Heat Transfer, Refrigeration and Air Conditioning

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.

Answer: Option B

Explanation:

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27. 

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

A. True
B. False

Answer: Option A

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

Answer: Option A

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

Answer: Option B

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

Answer: Option A

Explanation:

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