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Question: It is not preferable to use superheated steam in evaporators, because of its very
[A].

high temperature

[B].

high pressure

[C].

low film co-efficient

[D].

none of these

Answer: Option C

Explanation:

No answer description available for this question.

Question: Boiling point of a solution according to Duhring’s rule is a linear function of the __________ of water.
[A].

boiling point (at the same pressure)

[B].

viscosity

[C].

density

[D].

thermal conductivity

Answer: Option A

Explanation:

No answer description available for this question.

Question: Overall heat transfer co-efficient for cooling of hydrocarbons by water is about
[A].

50 -100 Kcal/hr.m2.°C

[B].

50 -100 W/m2 . °K

[C].

50 -100 BTU/hr. ft.2°F

[D].

1000 – 1500 BTU/hr. ft.2°F

Answer: Option C

Explanation:

No answer description available for this question.

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.