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CHEMICAL ENGINEERING

In Biot number, the characteristic length used is the ratio of the __________ of the solid.

CHEMICAL ENGINEERING, Heat Transfer /
Question: In Biot number, the characteristic length used is the ratio of the __________ of the solid.
[A].

volume to surface area

[B].

perimeter to surface area

[C].

surface area to volume

[D].

surface area to perimeter

Answer: Option A

Explanation:

No answer description available for this question.

In Biot number, the characteristic length used is the ratio of the __________ of the solid. Read More »

CHEMICAL ENGINEERING, Heat Transfer

A backward feed multiple effect evaporator is better than forward feed for concentrating cold feed, because it provides

CHEMICAL ENGINEERING, Heat Transfer /
Question: A backward feed multiple effect evaporator is better than forward feed for concentrating cold feed, because it provides
[A].

higher economy

[B].

lower capacity

[C].

both (a) & (b)

[D].

lower economy

Answer: Option A

Explanation:

No answer description available for this question.

A backward feed multiple effect evaporator is better than forward feed for concentrating cold feed, because it provides Read More »

CHEMICAL ENGINEERING, Heat Transfer

With increase in temperature, the thermal conductivity of fresh lubricating oil

CHEMICAL ENGINEERING, Heat Transfer /
Question: With increase in temperature, the thermal conductivity of fresh lubricating oil
[A].

increases

[B].

decreases

[C].

remains unchanged

[D].

may increase or decrease; depends on its composition

Answer: Option B

Explanation:

No answer description available for this question.

With increase in temperature, the thermal conductivity of fresh lubricating oil Read More »

CHEMICAL ENGINEERING, Heat Transfer

If air (a non-condensing gas) is present in a condensing vapor stream, it will __________ the condensation rate of vapor.

CHEMICAL ENGINEERING, Heat Transfer /
Question: If air (a non-condensing gas) is present in a condensing vapor stream, it will __________ the condensation rate of vapor.
[A].

increase

[B].

decrease

[C].

not affect

[D].

increase the condensing film co-efficient as well as

Answer: Option B

Explanation:

No answer description available for this question.

If air (a non-condensing gas) is present in a condensing vapor stream, it will __________ the condensation rate of vapor. Read More »

CHEMICAL ENGINEERING, Heat Transfer

In case of a multipass shell and tube heat exchanger, providing a baffle on the shell side __________ the heat transfer rate.

CHEMICAL ENGINEERING, Heat Transfer /
Question: In case of a multipass shell and tube heat exchanger, providing a baffle on the shell side __________ the heat transfer rate.
[A].

increases

[B].

decreases

[C].

does not affect

[D].

may increase or decrease, depends on the type of baffle

Answer: Option A

Explanation:

No answer description available for this question.

In case of a multipass shell and tube heat exchanger, providing a baffle on the shell side __________ the heat transfer rate. Read More »

CHEMICAL ENGINEERING, Heat Transfer

Fouling factor for a heat exchanger is given by (where, U1 = heat transfer co-efficient of dirty surface U2 = heat transfer co-efficient of clean surface)

CHEMICAL ENGINEERING, Heat Transfer /
Question: Fouling factor for a heat exchanger is given by (where, U1 = heat transfer co-efficient of dirty surface U2 = heat transfer co-efficient of clean surface)
[A].

U1 – U2

[B].

[C].

[D].

U2 – U1

Answer: Option B

Explanation:

No answer description available for this question.

Fouling factor for a heat exchanger is given by (where, U1 = heat transfer co-efficient of dirty surface U2 = heat transfer co-efficient of clean surface) Read More »

CHEMICAL ENGINEERING, Heat Transfer

Mode of heat transfer in which the fluid moves under the influence of changes in fluid pressure produced by external work is called

CHEMICAL ENGINEERING, Heat Transfer /
Question: Mode of heat transfer in which the fluid moves under the influence of changes in fluid pressure produced by external work is called
[A].

radiation

[B].

natural convection

[C].

forced convection

[D].

conduction

Answer: Option C

Explanation:

No answer description available for this question.

Mode of heat transfer in which the fluid moves under the influence of changes in fluid pressure produced by external work is called Read More »

CHEMICAL ENGINEERING, Heat Transfer

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

CHEMICAL ENGINEERING, Heat Transfer /
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.

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

CHEMICAL ENGINEERING, Heat Transfer

Grashoff number, which is defined as g . β(Ts – T∞) ρ2. L3/μ2, is proportional to the ratio of buoyancy force to __________ force.

CHEMICAL ENGINEERING, Heat Transfer /
Question: Grashoff number, which is defined as g . β(Ts – T∞) ρ2. L3/μ2, is proportional to the ratio of buoyancy force to __________ force.
[A].

viscous

[B].

elastic

[C].

inertial

[D].

none of these

Answer: Option A

Explanation:

No answer description available for this question.

Grashoff number, which is defined as g . β(Ts – T∞) ρ2. L3/μ2, is proportional to the ratio of buoyancy force to __________ force. Read More »

CHEMICAL ENGINEERING, Heat Transfer