Chemical Engineering - Heat Transfer

41. 

View factor is important in heat transfer by

A. steady state conduction
B. natural convection
C. forced convection
D. radiation

Answer: Option D

Explanation:

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42. 

The advantage of using a 1 - 2 shell and tube heat exchanger over a 1 - 1 shell and tube heat exchanger is

A. lower tube side pressure drop.
B. lower shell side pressure drop.
C. higher tube side heat transfer co-efficient.
D. higher shell side heat transfer co-efficient.

Answer: Option C

Explanation:

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43. 

For a multipass shell and tube heat exchanger, the LMTD correction factor is always

A. 1
B. > 1
C. < 1
D. between 1 & 2

Answer: Option C

Explanation:

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44. 

If heat transfer rate varies with the time, it is termed as

A. forced convection
B. steady state conduction
C. monochromatic radiation
D. none of these

Answer: Option D

Explanation:

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45. 

Pick out the wrong statement.

A. Fluid movement under the influence of buoyant forces resulting from change in density takes place in case of natural convection.
B. The ratio NNu/NRe . Npr is called the Stanton number.
C. The Peclet number is a measure of the ratio of energy transport by convection to that by conduction.
D. The Colbum jH factor for heat transfer is given by Nst Npr.

Answer: Option D

Explanation:

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