Chemical Engineering - Heat Transfer

6. 

Water is normally used as a coolant in the heat exchange equipments mainly because ofits

A. abundance & high heat capacity
B. low density
C. low viscosity
D. high fluidity

Answer: Option A

Explanation:

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7. 

The rate of emission of radiation by a body does not depend upon the

A. wavelength of radiation.
B. surface temperature of the body.
C. nature of the surface.
D. shape and porosity of the body.

Answer: Option D

Explanation:

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8. 

Which of the following has maximum thermal conductivity at the same temperature?

A. Steel
B. Petrol
C. Air
D. All have the same conductivity

Answer: Option A

Explanation:

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9. 

Maximum heat transfer rate is obtained in __________ flow.

A. laminar
B. turbulent
C. creeping
D. transition region

Answer: Option B

Explanation:

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10. 

In case of __________ boiling, the liquid temperature is below the saturation temperature and the boiling takes place in the vicinity of the heated surface.

A. nucleate
B. local
C. pool
D. saturated

Answer: Option B

Explanation:

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