According to Stefan’s law, the total radiation from a black body per second per unit area is proportional to____________________?

Byadmin January 24, 2019August 16, 2021

According to Stefan’s law, the total radiation from a black body per second per unit area is proportional to____________________?

A. absolute temperature
B. T2
C. T5
D. t
E. l/T

Heat Transfer

The amount of heat flow through a body by conduction is_______________?

The amount of heat flow through a body by conduction is_______________?

A. directly proportional to the surface area of the body
B. directly proportional to the temperature difference on the two faces of the body
C. dependent upon the material of the body
D. inversely proportional to the thickness of the body
E. all of the above

Read More The amount of heat flow through a body by conduction is_______________?
Heat Transfer | Mechanical Engineering | Refrigeration and Air Conditioning

Fouling factor is used

Question: Fouling factor is used
[A].

in heat exchanger design as a safety factor
[B].
in case of Newtonian fluids
[C].
when a liquid exchanges heat with a gas
[D].
none of the above

Answer: Option A

Explanation:

No answer description available for this question.

Read More Fouling factor is used
Heat Transfer | Mechanical Engineering | Refrigeration and Air Conditioning

The capillary tube, as an expansion device, is used in

Question: The capillary tube, as an expansion device, is used in
[A].

domestic refrigerators
[B].
water coolers
[C].
room air conditioners
[D].
all of these

Answer: Option D

Explanation:

No answer description available for this question.

Read More The capillary tube, as an expansion device, is used in
CHEMICAL ENGINEERING | Heat Transfer

Film boiling is usually not desired in commercial equipments, because

Question: Film boiling is usually not desired in commercial equipments, because
[A].

the heat transfer rate is low in view of the large temperature drop.
[B].
it is difficult to maintain.
[C].
it is not economic.
[D].
none of these.

Answer: Option A

Explanation:

No answer description available for this question.

Read More Film boiling is usually not desired in commercial equipments, because
CHEMICAL ENGINEERING | Heat Transfer

A wall has two layers of materials A and B; each made of a different material. Both the layers have the same thickness. The thermal conductivity of materialA is twice that of B. Under the equilibrium, the temperature difference across the wall is 36°C. The temperature difference across the layer A is __________ °C.

Question: A wall has two layers of materials A and B; each made of a different material. Both the layers have the same thickness. The thermal conductivity of materialA is twice that of B. Under the equilibrium, the temperature difference across the wall is 36°C. The temperature difference across the layer A is __________ °C.
[A].

6
[B].
12
[C].
18
[D].
24

Answer: Option B

Explanation:

No answer description available for this question.

Read More A wall has two layers of materials A and B; each made of a different material. Both the layers have the same thickness. The thermal conductivity of materialA is twice that of B. Under the equilibrium, the temperature difference across the wall is 36°C. The temperature difference across the layer A is __________ °C.
CHEMICAL ENGINEERING | Heat Transfer

‘Duhring’s plot’ is of use in

Question: ‘Duhring’s plot’ is of use in
[A].

extractive distillation
[B].
evaporation
[C].
leaching
[D].
absorption

Answer: Option B

Explanation:

No answer description available for this question.

Read More ‘Duhring’s plot’ is of use in

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