Chemical Engineering - Heat Transfer

11. 

The ratio of velocity head to tube side return loss in case of a multipass shell and tube heat exchanger is

A. 2
B. 1/2
C. 4
D. 1/4

Answer: Option D

Explanation:

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12. 

Terminal point temperature differences between fluids in case of a heat exchanger is termed as

A. approach.
B. log mean temperature difference.
C. arithmetic mean temperature difference.
D. geometric mean temperature difference.

Answer: Option A

Explanation:

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13. 

LMTD can't be used as such without a correction factor for the

A. multipass heat exchanger.
B. baffled heat exchanger.
C. condensation of mixed vapour in a condenser.
D. all (a) (b) and (c).

Answer: Option D

Explanation:

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14. 

Fqra cold viscous feed, backward feed gives __________ than forward feed.

A. a higher capacity
B. a lower capacity
C. lower economy
D. none of these

Answer: Option A

Explanation:

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15. 

Walls of a cubical oven are of thickness l, and they are made of material of thermal conductivity k. The temperature inside the oven is 100°C and the inside heat transfer co-efficient is 3k/l. If the wall temperature on the outside is held at 25°C, what is the inside wall temperature in degree centigrade ?

A. 35.5
B. 43.75
C. 81.25
D. 48.25

Answer: Option C

Explanation:

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