Mechanical Engineering - Heat Transfer, Refrigeration and Air Conditioning

6. 

The temperature of air recorded by a thermometer, when it is not effected by the moisture present in the air, is called

A. wet bulb temperature
B. dry bulb temperature
C. dew point temperature
D. none of these

Answer: Option B

Explanation:

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7. 

A human body feels comfortable when the heat produced by the metabolism of human body is equal to the

A. heat dissipated to the surroundings
B. heat stored in the human body
C. sum of (a) and (b)
D. difference of (a) and (b)

Answer: Option C

Explanation:

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8. 

During sensible cooling,

A. relative humidity remains constant
B. wet bulb temperature increases
C. specific humidity increases
D. partial pressure of vapour remains constant

Answer: Option D

Explanation:

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9. 

The wave length of the radiation emitted depends only on the temperature and is independent of the material of the body.

A. True
B. False

Answer: Option A

Explanation:

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10. 

The process of heat transfer from one particle of the body to another by the actual motion of the heated particles, is called

A. conduction
B. convection
C. radiation

Answer: Option B

Explanation:

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