Mechanical Engineering - Heat Transfer, Refrigeration and Air Conditioning

36. 

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

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

Answer: Option A

Explanation:

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37. 

The use of heat exchangers is made in

A. radiators in automobile
B. condensers and boilers in steam plants
C. condensers and evaporators in refrigeration and air conditioning units
D. all of the above

Answer: Option D

Explanation:

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38. 

In a heat exchanger with one fluid evaporating or condensing, the surface area required is least in

A. parallel flow
B. counter flow
C. cross flow
D. all of these

Answer: Option D

Explanation:

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39. 

Which of the following statement is correct?

A. A grey body is one which absorbs all radiations incident on it.
B. At thermal equilibrium, the emissivity and absorptivity are same.
C. The energy absorbed by a body to the total energy falling on it, is called emissivity.
D. A perfect body is one which is black in colour.

Answer: Option B

Explanation:

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40. 

The horizontal and uniformly spaced lines on a psychrometric chart indicates relative humidity.

A. Correct
B. Incorrect

Answer: Option B

Explanation:

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