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Heat Transfer

In case of a supercooled solution, which is on the verge of crystallisation, the free energy of the solution as compared to that of the solid is

CHEMICAL ENGINEERING, Heat Transfer /
Question: In case of a supercooled solution, which is on the verge of crystallisation, the free energy of the solution as compared to that of the solid is
[A].

more

[B].

less

[C].

same

[D].

more or less; depends on the nature of solution

Answer: Option A

Explanation:

No answer description available for this question.

In case of a supercooled solution, which is on the verge of crystallisation, the free energy of the solution as compared to that of the solid is Read More »

CHEMICAL ENGINEERING, Heat Transfer

Maximum water velocity in tubes of a 1-2 shell and tube heat exchanger may be around __________ metres/second.

CHEMICAL ENGINEERING, Heat Transfer /
Question: Maximum water velocity in tubes of a 1-2 shell and tube heat exchanger may be around __________ metres/second.
[A].

1

[B].

10

[C].

20

[D].

30

Answer: Option A

Explanation:

No answer description available for this question.

Maximum water velocity in tubes of a 1-2 shell and tube heat exchanger may be around __________ metres/second. Read More »

CHEMICAL ENGINEERING, Heat Transfer

For concentrating an aqueous solution of a material like anhydrous Na2SO4, whose solubility decreases with rise in temperature, the most suitable evaporator is a __________ evaporator.

CHEMICAL ENGINEERING, Heat Transfer /
Question: For concentrating an aqueous solution of a material like anhydrous Na2SO4, whose solubility decreases with rise in temperature, the most suitable evaporator is a __________ evaporator.
[A].

high pressure

[B].

vacuum

[C].

backward feed

[D].

none of these

Answer: Option B

Explanation:

No answer description available for this question.

For concentrating an aqueous solution of a material like anhydrous Na2SO4, whose solubility decreases with rise in temperature, the most suitable evaporator is a __________ evaporator. Read More »

CHEMICAL ENGINEERING, Heat Transfer

In a heat exchanger, one transfer unit means

CHEMICAL ENGINEERING, Heat Transfer /
Question: In a heat exchanger, one transfer unit means
[A].

a section of the exchanger in which change in temperature of one stream equals the average driving force in the section.

[B].

the size of the exchanger in which heat transfer rate is 1 kcal/hr.

[C].

both (a) and (b)

[D].

none of these

Answer: Option A

Explanation:

No answer description available for this question.

In a heat exchanger, one transfer unit means Read More »

CHEMICAL ENGINEERING, Heat Transfer

Overall heat transfer co-efficient of a particular tube is U1. If the same tube with some dirt deposited on either side has coefficient U2, then

CHEMICAL ENGINEERING, Heat Transfer /
Question: Overall heat transfer co-efficient of a particular tube is U1. If the same tube with some dirt deposited on either side has coefficient U2, then
[A].

U1 = U2

[B].

U2 > U1

[C].

U1 > U2

[D].

U1 = dirt factor – U2

Answer: Option A

Explanation:

No answer description available for this question.

Overall heat transfer co-efficient of a particular tube is U1. If the same tube with some dirt deposited on either side has coefficient U2, then Read More »

CHEMICAL ENGINEERING, Heat Transfer

Asymptotic conditions is reached, when for a fluid flowing in laminar flow through a long tube

CHEMICAL ENGINEERING, Heat Transfer /
Question: Asymptotic conditions is reached, when for a fluid flowing in laminar flow through a long tube
[A].

exit-fluid temperature > wall temperature.

[B].

exit fluid temperature < wall temperature.

[C].

exit fluid temperature = wall temperature.

[D].

Graetz number > 100.

Answer: Option C

Explanation:

No answer description available for this question.

Asymptotic conditions is reached, when for a fluid flowing in laminar flow through a long tube Read More »

CHEMICAL ENGINEERING, Heat Transfer

Heat exchangers operating, when the asymptotic range is reached,

CHEMICAL ENGINEERING, Heat Transfer /
Question: Heat exchangers operating, when the asymptotic range is reached,
[A].

provide very large heat transfer co-efficient.

[B].

results in making part of the heating surface inactive.

[C].

results in abruptly increased velocity.

[D].

none of these.

Answer: Option B

Explanation:

No answer description available for this question.

Heat exchangers operating, when the asymptotic range is reached, Read More »

CHEMICAL ENGINEERING, Heat Transfer