Heat Transfer Archives - Page 28 of 57 -

__________ equation relates the thermal conductivity of a solid to its temperature.

CHEMICAL ENGINEERING, Heat Transfer / admin

Question: __________ equation relates the thermal conductivity of a solid to its temperature.
[A].

Antonie

[B].

Kopp’s

[C].

Lee’s

[D].

Kistyakowski

Answer: Option C

Explanation:

No answer description available for this question.

__________ equation relates the thermal conductivity of a solid to its temperature. Read More »

For __________ Prandtl number values, the heat conduction will be negligible in the buffer zone.

CHEMICAL ENGINEERING, Heat Transfer / admin

Question: For __________ Prandtl number values, the heat conduction will be negligible in the buffer zone.
[A].

extremely low

[B].

low

[C].

high

[D].

Answer: Option C

Explanation:

No answer description available for this question.

For __________ Prandtl number values, the heat conduction will be negligible in the buffer zone. Read More »

CHEMICAL ENGINEERING, Heat Transfer

Nusselt number is the ratio of the temperature gradient at the wall to

CHEMICAL ENGINEERING, Heat Transfer / admin

Question: Nusselt number is the ratio of the temperature gradient at the wall to
[A].

temperature difference

[B].

heat flux

[C].

that across the entire pipe

[D].

none of these

Answer: Option C

Explanation:

No answer description available for this question.

Nusselt number is the ratio of the temperature gradient at the wall to Read More »

CHEMICAL ENGINEERING, Heat Transfer

Minimum recommended baffle spacing in a shell and tube heat exchanger is about (where, D = shell diameter)

CHEMICAL ENGINEERING, Heat Transfer / admin

Question: Minimum recommended baffle spacing in a shell and tube heat exchanger is about (where, D = shell diameter)
[A].

0.2 D

[B].

0.5 D

[C].

0.66 D

[D].

0.80 D

Answer: Option A

Explanation:

No answer description available for this question.

CHEMICAL ENGINEERING, Heat Transfer

Baffles are provided in heat exchangers to increase the

CHEMICAL ENGINEERING, Heat Transfer / admin

Question: Baffles are provided in heat exchangers to increase the
[A].

fouling factor

[B].

heat transfer area

[C].

heat transfer co-efficient

[D].

heat transfer rate

Answer: Option C

Explanation:

No answer description available for this question.

Baffles are provided in heat exchangers to increase the Read More »

CHEMICAL ENGINEERING, Heat Transfer

If heat transfer rate varies with the time, it is termed as

CHEMICAL ENGINEERING, Heat Transfer / admin

Question: If heat transfer rate varies with the time, it is termed as
[A].

forced convection

[B].

steady state conduction

[C].

monochromatic radiation

[D].

none of these

Answer: Option D

Explanation:

No answer description available for this question.

If heat transfer rate varies with the time, it is termed as Read More »

CHEMICAL ENGINEERING, Heat Transfer

A hot body will radiate heat most rapidly, if its surface is

CHEMICAL ENGINEERING, Heat Transfer / admin

Question: A hot body will radiate heat most rapidly, if its surface is
[A].

white & rough

[B].

black & rough

[C].

white & polished

[D].

black & polished

Answer: Option B

Explanation:

No answer description available for this question.

A hot body will radiate heat most rapidly, if its surface is Read More »

CHEMICAL ENGINEERING, Heat Transfer

A black body when hot, emits heat radiation of __________ wavelengths.

CHEMICAL ENGINEERING, Heat Transfer / admin

Question: A black body when hot, emits heat radiation of __________ wavelengths.
[A].

small

[B].

large

[C].

all

[D].

one fixed

Answer: Option C

Explanation:

No answer description available for this question.

A black body when hot, emits heat radiation of __________ wavelengths. Read More »

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.

CHEMICAL ENGINEERING, Heat Transfer / admin

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].

[B].

[C].

[D].

Answer: Option B

Explanation:

No answer description available for this 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. Read More »

CHEMICAL ENGINEERING, Heat Transfer