Heat Transfer

Question: In a shell and tube heat exchanger, putting a longitudinal baffle across the shell, forces the shell side fluid to pass __________ through the heat exchanger.
[A].

once

[B].

twice

[C].

thrice

[D].

four times

Answer: Option B

Explanation:

No answer description available for this question.

Question: __________ heat exchanger is the most suitable, when the temperature of shell side fluid is much higher than that of tube side.
[A].

Single pass, fixed tube sheet

[B].

U-tube

[C].

Three pass, fixed tube sheet

[D].

none of these

Answer: Option B

Explanation:

No answer description available for this question.

Question: __________ heat exchanger is used for chilling oil to be dewaxed.
[A].

U-tube

[B].

Double pipe

[C].

Fixed tube

[D].

Floating head

Answer: Option B

Explanation:

No answer description available for this question.

Question: Controlling heat transfer film co-efficient is the one, which offers __________ resistance to heat transfer.
[A].

no

[B].

the least

[C].

the largest

[D].

lower

Answer: Option C

Explanation:

No answer description available for this question.

Question: Electromagnetic radiations propagate in vacuum with a velocity of __________ metre/second.
[A].

3 x l05

[B].

3 x l08

[C].

3 x l010

[D].

3 x l012

Answer: Option B

Explanation:

No answer description available for this question.

Question: Calburn analogy is applicable for the value of Prandtl number from
[A].

0.001 to 1

[B].

0.6 to 120

[C].

0.5 to 5

[D].

120 to 400

Answer: Option B

Explanation:

No answer description available for this question.

Question: (NGr x NPr) is called the __________ number.
[A].

Graetz

[B].

Reyleigh

[C].

Nusselt

[D].

Stanton

Answer: Option B

Explanation:

No answer description available for this question.

Question: According to Reynolds analogy, Stanton number is equal to (where, f = Fanning friction factor)
[A].

2f

[B].

f

[C].

f/2

[D].

f/4

Answer: Option C

Explanation:

No answer description available for this question.

Question: Nusselt number for full developed, laminar, constant property flow in a pipe at uniform heat flux is
[A].

0.72

[B].

4.364

[C].

18

[D].

83

Answer: Option B

Explanation:

No answer description available for this question.

Question: Duhring rule is important in solving problems on
[A].

distillation

[B].

crystallisation

[C].

evaporation

[D].

humidification

Answer: Option C

Explanation:

No answer description available for this question.