Chemical Engineering Archives | Page 71 of 357

Heat flux through several resistances in series in analogous to the current flowing through several

August 23, 2022 by admin

Question: Heat flux through several resistances in series in analogous to the current flowing through several
[A].

resistances in parallel.

[B].

capacitors in series.

[C].

resistances in series.

[D].

none of these.

Answer: Option C

Explanation:

No answer description available for this question.

An insulator should have

August 23, 2022 by admin

Question: An insulator should have
[A].

low thermal conductivity.

[B].

high thermal conductivity.

[C].

less resistance to heat flow.

[D].

a porous structure.

Answer: Option A

Explanation:

No answer description available for this question.

Fourier’s law of heat conduction applies to __________ surfaces.

August 23, 2022 by admin

Question: Fourier’s law of heat conduction applies to __________ surfaces.
[A].

isothermal

[B].

non-isothermal

[C].

both (a) and (b)

[D].

neither (a) and (b)

Answer: Option C

Explanation:

No answer description available for this question.

Fourier’s law applies to the heat transfer by

August 23, 2022 by admin

Question: Fourier’s law applies to the heat transfer by
[A].

convection

[B].

radiation

[C].

conduction

[D].

all (a), (b) & (c)

Answer: Option C

Explanation:

No answer description available for this question.

Loss of heat from untagged steam pipe to the ambient air is by

August 23, 2022 by admin

Question: Loss of heat from untagged steam pipe to the ambient air is by
[A].

conduction

[B].

convection

[C].

radiation

[D].

all (a), (b) & (c)

Answer: Option D

Explanation:

No answer description available for this question.

In a furnace employing forced draught as compared to induced draught,

August 23, 2022 by admin

Question: In a furnace employing forced draught as compared to induced draught,
[A].

air is sucked in, so air leaks are more and hence the furnace efficiency is reduced.

[B].

the fan operates hot and hence blades are liable to corrosion and erosion.

[C].

positive pressure exists in the furnace.

[D].

none of these

Answer: Option C

Explanation:

No answer description available for this question.

Ceramic coating material for furnace refractory, which increases its emissivity and thus the radiation heat transfer rate in the furnace, comprises of

August 23, 2022 by admin

Question: Ceramic coating material for furnace refractory, which increases its emissivity and thus the radiation heat transfer rate in the furnace, comprises of
[A].

graphite powder

[B].

thoria

[C].

zircon powder

[D].

beryllium

Answer: Option C

Explanation:

No answer description available for this question.

Combustion of fuel in a furnace with oxygen enriched air results in higher

August 23, 2022 by admin

Question: Combustion of fuel in a furnace with oxygen enriched air results in higher
[A].

flue gas volume

[B].

flame temperature

[C].

fuel consumption

[D].

stack loss

Answer: Option B

Explanation:

No answer description available for this question.

Artificial draught produced by a fan in the furnace can be controlled by the

August 23, 2022 by admin

Question: Artificial draught produced by a fan in the furnace can be controlled by the
[A].

speed of the fan.

[B].

damper.

[C].

variation in the pitch of fan blades.

[D].

all (a), (b) and (c).

Answer: Option D

Explanation:

No answer description available for this question.

The advantages of firing pulverised coal in the furnace lies in the fact that, it

August 23, 2022 by admin

Question: The advantages of firing pulverised coal in the furnace lies in the fact that, it
[A].

permits the use of high ash content coal.

[B].

permits the use of low fusion point ash coal.

[C].

accelerates the burning rate and economises on fuel consumption.

[D].

all (a), (b) and (c).

Answer: Option C

Explanation:

No answer description available for this question.