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CHEMICAL ENGINEERING

If average heat transfer co-efficient is ha and the local coefficient at the end of the plate is hl then in case of heat transfer to a fluid flowing over a flat plate, heated over its entire length

CHEMICAL ENGINEERING, Heat Transfer /
Question: If average heat transfer co-efficient is ha and the local coefficient at the end of the plate is hl then in case of heat transfer to a fluid flowing over a flat plate, heated over its entire length
[A].

ha = hl

[B].

ha = 2hl

[C].

ha = 0.5 hl

[D].

ha = 0.75 hl

Answer: Option B

Explanation:

No answer description available for this question.

If average heat transfer co-efficient is ha and the local coefficient at the end of the plate is hl then in case of heat transfer to a fluid flowing over a flat plate, heated over its entire length Read More »

CHEMICAL ENGINEERING, Heat Transfer

For a liquid in laminar flow through a very long tube, when the exit fluid temperature approaches the wall temperature, the equation to be used is

CHEMICAL ENGINEERING, Heat Transfer /
Question: For a liquid in laminar flow through a very long tube, when the exit fluid temperature approaches the wall temperature, the equation to be used is
[A].

Nu = 0.023 Re0.8 . Pr0.4

[B].

Nu = Gz

[C].

Nu = Gz

[D].

Nu = 2Gz0.5

Answer: Option C

Explanation:

No answer description available for this question.

For a liquid in laminar flow through a very long tube, when the exit fluid temperature approaches the wall temperature, the equation to be used is Read More »

CHEMICAL ENGINEERING, Heat Transfer

Dietus-Boelter equation used for the determination of heat transfer co-efficient is valid

CHEMICAL ENGINEERING, Heat Transfer /
Question: Dietus-Boelter equation used for the determination of heat transfer co-efficient is valid
[A].

for fluids in laminar flow.

[B].

for fluids in tubulent flow.

[C].

when Grashhoff number is very important.

[D].

for liquid metals.

Answer: Option B

Explanation:

No answer description available for this question.

Dietus-Boelter equation used for the determination of heat transfer co-efficient is valid Read More »

CHEMICAL ENGINEERING, Heat Transfer

Conduction occurs in the buffer zone for a fluid flowing through a heated pipe, only when Prandtl number is

CHEMICAL ENGINEERING, Heat Transfer /
Question: Conduction occurs in the buffer zone for a fluid flowing through a heated pipe, only when Prandtl number is
[A].

0.1

[B].

>1

[C].

< 1

[D].

l

Answer: Option A

Explanation:

No answer description available for this question.

Conduction occurs in the buffer zone for a fluid flowing through a heated pipe, only when Prandtl number is Read More »

CHEMICAL ENGINEERING, Heat Transfer

At Pr > 1, conduction in an ordinary fluid flowing through a heated pipe is limited to the

CHEMICAL ENGINEERING, Heat Transfer /
Question: At Pr > 1, conduction in an ordinary fluid flowing through a heated pipe is limited to the
[A].

buffer zone

[B].

turbulent core

[C].

both (a) and (b)

[D].

viscous sub-layer

Answer: Option D

Explanation:

No answer description available for this question.

At Pr > 1, conduction in an ordinary fluid flowing through a heated pipe is limited to the Read More »

CHEMICAL ENGINEERING, Heat Transfer