Furnace Technology

Question: Neutral atmosphere is maintained in a/an __________ furnace.
[A].

cold rolled steel coil annealing

[B].

open hearth

[C].

soaking pit

[D].

walking beam reheating

Answer: Option A

Explanation:

No answer description available for this question.

Question: Maximum heat transfer in high temperature furnaces is by
[A].

conduction

[B].

convection

[C].

radiation

[D].

either (a), (b) or (c); depends on the type of furnace

Answer: Option C

Explanation:

No answer description available for this question.

Question: Oxygen enrichment of combustion air does not result in increase of the
[A].

flame temperature.

[B].

oxygen in the flue gas.

[C].

stack loss.

[D].

heat transfer rate in the furnace.

Answer: Option B

Explanation:

No answer description available for this question.

Question: Low stack loss indicates the
[A].

use of sub-stoichiometric air for combustion.

[B].

efficient use of fuel.

[C].

inefficient use of fuel.

[D].

oxygen enrichment of combustion air.

Answer: Option B

Explanation:

No answer description available for this question.

Question: Acid dew point temperature (ADT) of a flue gas produced by the combustion of a fuel containing 1% sulphur may be about __________ °C.
[A].

80

[B].

130

[C].

180

[D].

250

Answer: Option B

Explanation:

No answer description available for this question.

Question: Heat transfer rate to the stock/charge in the furnace does not depend upon the
[A].

emissivity of the refactory walls.

[B].

size of the furance.

[C].

use of waste heat recovery equipments.

[D].

thickness of the stock.

Answer: Option C

Explanation:

No answer description available for this question.

Question: Cement Kiln is a
[A].

rotary Kiln

[B].

tunnel Kiln

[C].

natural draft furnace

[D].

batch furnace

Answer: Option A

Explanation:

No answer description available for this question.

Question: Calcination of limestone to produce lime is done in a __________ kiln.
[A].

tunnel

[B].

rotary

[C].

vertical shaft

[D].

both (b) and (c)

Answer: Option D

Explanation:

No answer description available for this question.

Question: __________ atmosphere is maintained inside an iron blast furnace.
[A].

Oxidising

[B].

Reducing

[C].

Inert

[D].

Decarburising

Answer: Option B

Explanation:

No answer description available for this question.

Question: Air filtration in a furnace
[A].

reduces its thermal efficiency.

[B].

is indicated by flame sting out.

[C].

increases the flue gas temperature.

[D].

none of these.

Answer: Option A

Explanation:

No answer description available for this question.