Thermal diffusivity of a substance is __________________?

Byadmin January 24, 2019August 16, 2021

Thermal diffusivity of a substance is __________________?

A. directly proportional to thermal con¬ductivity
B. inversely proportional to density of substance
C. inversely proportional to specific heat
D. all of the above
E. none of the above

CHEMICAL ENGINEERING | Heat Transfer

At what value of Prandtl number, the hydrodynamic and thermal boundary layers are identical ?

Question: At what value of Prandtl number, the hydrodynamic and thermal boundary layers are identical ?
[A].

0.5
[B].
1
[C].
1.5
[D].
80

Answer: Option B

Explanation:

No answer description available for this question.

Read More At what value of Prandtl number, the hydrodynamic and thermal boundary layers are identical ?
CHEMICAL ENGINEERING | Heat Transfer

In case of a multipass shell and tube heat exchanger, the temperature drop in the fluid

Question: In case of a multipass shell and tube heat exchanger, the temperature drop in the fluid
[A].

is inversely proportional to the resistance across which the drop occurs.
[B].
and the wall are proportional to individual resistances.
[C].
and the wall is not related.
[D].
none of these.

Answer: Option B

Explanation:

No answer description available for this question.

Read More In case of a multipass shell and tube heat exchanger, the temperature drop in the fluid
Heat Transfer | Mechanical Engineering | Refrigeration and Air Conditioning

During sensible heating of air, specific humidity remains constant.

Question: During sensible heating of air, specific humidity remains constant.
[A].

Agree
[B].
Disagree

Answer: Option A

Explanation:

No answer description available for this question.

Read More During sensible heating of air, specific humidity remains constant.
CHEMICAL ENGINEERING | Heat Transfer

For a fluid flowing in an annulus space, the wetted perimeter for heat transfer and pressure drop are

Question: For a fluid flowing in an annulus space, the wetted perimeter for heat transfer and pressure drop are
[A].

same
[B].
different
[C].
never different
[D].
linearly related

Answer: Option B

Explanation:

No answer description available for this question.

Read More For a fluid flowing in an annulus space, the wetted perimeter for heat transfer and pressure drop are
Heat Transfer | Mechanical Engineering | Refrigeration and Air Conditioning

In aircraft, air refrigeration Cycle is used because of

Question: In aircraft, air refrigeration Cycle is used because of
[A].

low weight per tonne of refrigeration
[B].
high heat transfer rate
[C].
low temperature at high altitudes
[D].
higher coefficient of performance

Answer: Option A

Explanation:

No answer description available for this question.

Read More In aircraft, air refrigeration Cycle is used because of
Heat Transfer | Mechanical Engineering | Refrigeration and Air Conditioning

Which of the following statement is correct for ammonia as a refrigerant?

Question: Which of the following statement is correct for ammonia as a refrigerant?
[A].

It is toxic to mucous membranes.
[B].
it requires large displacement per TR compared to fluoro carbons.
[C].
It reacts with copper and its alloys.
[D].
all of these

Answer: Option D

Explanation:

No answer description available for this question.

Read More Which of the following statement is correct for ammonia as a refrigerant?

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