Heat Transfer

The unit of overall coefficient of heat transfer is___________________?

Byadmin January 24, 2019August 16, 2021

The unit of overall coefficient of heat transfer is___________________?

A. kcal/m2
B. kcal/hr °C
C. kcal/m2 hr °C
D. kacl/m hr °C
E. kcal/m3 hr °C

Heat Transfer

The ratio of heat flow Q1/Q2 from two walls of same thickness having their thermal conductivities as ATj – 2K2 will be ________________?

The ratio of heat flow Q1/Q2 from two walls of same thickness having their thermal conductivities as ATj – 2K2 will be ________________?

A. I
B. 0.5
C. 2
D. 0.25
E. 4.0

Read More The ratio of heat flow Q1/Q2 from two walls of same thickness having their thermal conductivities as ATj – 2K2 will be ________________?
CHEMICAL ENGINEERING | Heat Transfer

Finned tube heat exchangers

Question: Finned tube heat exchangers
[A].

give larger area per tube.
[B].
use metal fins of low thermal conductivity.
[C].
facilitate very large temperature drop through tube wall.
[D].
are used for smaller heat load.

Answer: Option A

Explanation:

No answer description available for this question.

Read More Finned tube heat exchangers
Heat Transfer | Mechanical Engineering | Refrigeration and Air Conditioning

In a shell and tube heat exchanger, baffles are provided on the shell side to

Question: In a shell and tube heat exchanger, baffles are provided on the shell side to
[A].

improve heat transfer
[B].
provide support for tubes
[C].
prevent stagnation of shell side fluid
[D].
all of these

Answer: Option D

Explanation:

No answer description available for this question.

Read More In a shell and tube heat exchanger, baffles are provided on the shell side to
CHEMICAL ENGINEERING | Heat Transfer

Heat transfer rate described by Fourier’s law will decrease, if the __________ increases.

Question: Heat transfer rate described by Fourier’s law will decrease, if the __________ increases.
[A].

thermal conductivity
[B].
thickness
[C].
temperature difference
[D].
heat transfer area

Answer: Option B

Explanation:

No answer description available for this question.

Read More Heat transfer rate described by Fourier’s law will decrease, if the __________ increases.
CHEMICAL ENGINEERING | Heat Transfer

A metal wire of 0.01 m dia and thermal conductivity 200 W/m.K is exposed to a fluid stream with a convective heat transfer coefficient of 100 W/m2.K. The Biot number is

Question: A metal wire of 0.01 m dia and thermal conductivity 200 W/m.K is exposed to a fluid stream with a convective heat transfer coefficient of 100 W/m2.K. The Biot number is
[A].

5.6
[B].
0.025
[C].
3.5
[D].
0.0035

Answer: Option B

Explanation:

No answer description available for this question.

Read More A metal wire of 0.01 m dia and thermal conductivity 200 W/m.K is exposed to a fluid stream with a convective heat transfer coefficient of 100 W/m2.K. The Biot number is
CHEMICAL ENGINEERING | Heat Transfer

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

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.

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

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