Heat Transfer

When heat is Transferred by molecular collision, it is referred to as heat transfer by __________________?

Byadmin January 24, 2019August 16, 2021

When heat is Transferred by molecular collision, it is referred to as heat transfer by __________________?

A. conduction
B. convection
C. radiation
D. scattering
E. convection and radiation

CHEMICAL ENGINEERING | Heat Transfer

Increasing the liquor level in the evaporator results in the

Question: Increasing the liquor level in the evaporator results in the
[A].

decreased capacity.
[B].
increase in liquor film co-efficient.
[C].
decreased effect of hydrostatic head.
[D].
increased true temperature drop.

Answer: Option A

Explanation:

No answer description available for this question.

Read More Increasing the liquor level in the evaporator results in the
Heat Transfer

In convection heat transfer from hot flue gases to water tube, even though flow may be turbulent, a laminar flow region (boundary layer of film) exists close to the tube. The heat transfer through this film takes place by___________________?

In convection heat transfer from hot flue gases to water tube, even though flow may be turbulent, a laminar flow region (boundary layer of film) exists close to the tube. The heat transfer through this film takes place by___________________?

A. convection
B. radiation
C. conduction
D. both convection and conduction
E. none of the above

Read More In convection heat transfer from hot flue gases to water tube, even though flow may be turbulent, a laminar flow region (boundary layer of film) exists close to the tube. The heat transfer through this film takes place by___________________?
CHEMICAL ENGINEERING | Heat Transfer

A body cools down from 75°C to 70°C in 10 minutes. It will cool down from 70° C to 65° C in __________ minutes.

Question: A body cools down from 75°C to 70°C in 10 minutes. It will cool down from 70° C to 65° C in __________ minutes.
[A].

10
[B].
>10
[C].
<10
[D].
either (b) or (c), depends on the mass of the body

Answer: Option B

Explanation:

No answer description available for this question.

Read More A body cools down from 75°C to 70°C in 10 minutes. It will cool down from 70° C to 65° C in __________ minutes.
CHEMICAL ENGINEERING | Heat Transfer

For large heat transfer area requirement, shell and tube heat exchanger is preferred, because it

Question: For large heat transfer area requirement, shell and tube heat exchanger is preferred, because it
[A].

occupies smaller space.
[B].
is more economical.
[C].
is easy to operate and maintain.
[D].
all (a), (b) and (c).

Answer: Option D

Explanation:

No answer description available for this question.

Read More For large heat transfer area requirement, shell and tube heat exchanger is preferred, because it
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 sensible heating of air __________ decreases.

Question: During sensible heating of air __________ decreases.
[A].

wet bulb temperature
[B].
relative humidity
[C].
dry bulb temperature
[D].
specific humidity

Answer: Option B

Explanation:

No answer description available for this question.

Read More During sensible heating of air __________ decreases.

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