Furnace Technology

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.

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.

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.

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.

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.

Question: Overfire burning in a furnace is a phenomenon characterised by
[A].

supply of excess fuel.

[B].

supply of excess air.

[C].

burning carbon monoxide and other incombustible in upper zone of furnace by supplying more air.

[D].

none of these.

Answer: Option C

Explanation:

No answer description available for this question.

Question: While the fuel fired furnace can be used upto a maximum temperature of about 1700°C, the electric furnace can be used upto a temperature of about __________ °C.
[A].

2000

[B].

3000

[C].

4500

[D].

6000

Answer: Option C

Explanation:

No answer description available for this question.

Question: __________ furnace is not an electric furnace.
[A].

Arc

[B].

Induction

[C].

Pot

[D].

Resistance.

Answer: Option C

Explanation:

No answer description available for this question.

Question: In furnaces operating at very high temperature (say) 1250°C, e.g. soaking pit), the maximum heat transfer takes place by
[A].

conduction

[B].

convection

[C].

radiation

[D].

can not be predicted.

Answer: Option C

Explanation:

No answer description available for this question.

Question: Out of the following fuels used in a furnace exhausting flue gas at a temperature of 600°C, the percentage stack loss will be maximum in case of complete combustion of
[A].

furnace oil with air.

[B].

furnace oil with oxygen.

[C].

blast furnace gas with air.

[D].

blast furnace gas with oxygen.

Answer: Option C

Explanation:

No answer description available for this question.