Fourier’s law of heat conduction is valid for_________________?

Byadmin January 24, 2019August 16, 2021

Fourier’s law of heat conduction is valid for_________________?

A. one dimensional cases only
B. two dimensional cases only
C. three dimensional cases only
D. regular surfaces having non-uniform temperature gradients
E. irregular surfaces

Heat Transfer

Thermal diffusivity of a substance is __________________?

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

Read More Thermal diffusivity of a substance is __________________?
Heat Transfer | Mechanical Engineering | Refrigeration and Air Conditioning

During heating and dehumidification process, dry bulb temperature

Question: During heating and dehumidification process, dry bulb temperature
[A].

remains constant
[B].
increases
[C].
decreases

Answer: Option B

Explanation:

No answer description available for this question.

Read More During heating and dehumidification process, dry bulb temperature
Heat Transfer | Mechanical Engineering | Refrigeration and Air Conditioning

Dew point temperature corresponds to the saturation temperature of vapour at its partial pressure.

Question: Dew point temperature corresponds to the saturation temperature of vapour at its partial pressure.
[A].

True
[B].
False

Answer: Option A

Explanation:

No answer description available for this question.

Read More Dew point temperature corresponds to the saturation temperature of vapour at its partial pressure.
CHEMICAL ENGINEERING | Heat Transfer

Extended heat transfer surface like fins are used to increase the heat transfer rate. Fin efficiency is defined as the ratio of heat transferred across the fin surface to the theoretical heat transfer across an equal area held at the

Question: Extended heat transfer surface like fins are used to increase the heat transfer rate. Fin efficiency is defined as the ratio of heat transferred across the fin surface to the theoretical heat transfer across an equal area held at the
[A].

surrounding temperature.
[B].
average temperature of the fin.
[C].
temperature of the fin end.
[D].
constant temperature equal to that of the base

Answer: Option D

Explanation:

No answer description available for this question.

Read More Extended heat transfer surface like fins are used to increase the heat transfer rate. Fin efficiency is defined as the ratio of heat transferred across the fin surface to the theoretical heat transfer across an equal area held at the
Heat Transfer

Two plates spaced 150 mm apart are maintained at 1000°C and 70°C. The heat transfer will take place mainly by ___________________?

Two plates spaced 150 mm apart are maintained at 1000°C and 70°C. The heat transfer will take place mainly by ___________________?

A. convection
B. free convection
C. forced convection
D. radiation
E. radiation and convection

Read More Two plates spaced 150 mm apart are maintained at 1000°C and 70°C. The heat transfer will take place mainly by ___________________?
CHEMICAL ENGINEERING | Heat Transfer

The advantage of backward feed multiple effect evaporators over forward feed units is that

Question: The advantage of backward feed multiple effect evaporators over forward feed units is that
[A].

heat sensitive material can be handled.
[B].
there is no additional cost of pumping.
[C].
most concentrated liquid is at highest temperature.
[D].
equal heat transfer co-efficients exist in various effects.

Answer: Option C

Explanation:

No answer description available for this question.

Read More The advantage of backward feed multiple effect evaporators over forward feed units is that

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