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Question: Advantages of use of preheated combustion air are
[A].

saving in fuel consumption.

[B].

reduction in scale losses.

[C].

increase in flame temperature.

[D].

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

Answer: Option D

Explanation:

No answer description available for this question.

Question: Oxygen percentage in the flue gas coming out of a gaseous fuel fired furnace should be ideally about __________ percent.
[A].

< 2

[B].

< 5

[C].

< 8

[D].

< 10

Answer: Option A

Explanation:

No answer description available for this question.

Question: An example of a periodic furnace is the
[A].

blast furnace stoves

[B].

blast furnace

[C].

coke oven heating chamber

[D].

rotary kilns

Answer: Option A

Explanation:

No answer description available for this question.

Question: In low or standard frequency induction furnace, heat is produced by the
[A].

combination of induced current and skin effect.

[B].

induction and resistance.

[C].

current flow through a heating element.

[D].

none of these.

Answer: Option B

Explanation:

No answer description available for this question.

Question: An electric furnace producing heat by means of an electric arc struck between each of three electrodes and the charge is called __________ furnace.
[A].

resistance

[B].

arc

[C].

low frequency induction

[D].

none of these

Answer: Option B

Explanation:

No answer description available for this question.

Question: Ingress of cold air in the furnaces through cracks, charging doors, openings etc.
[A].

reduces the flue gas temperature and makes the furnace atmosphere oxidising.

[B].

increases the load on the induced draft fan.

[C].

reduces the furnace draught.

[D].

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

Answer: Option D

Explanation:

No answer description available for this question.

Question: In a muffle furnace, the muffle
[A].

retards the heat transfer.

[B].

assists in temperature equalisation in the charge.

[C].

permits the use of controlled atmosphere for the protection of stock.

[D].

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

Answer: Option D

Explanation:

No answer description available for this question.

Question: Example of an indirectly heated furnace is
[A].

hood annealing furnace

[B].

muffle furnace

[C].

both (a) and (b)

[D].

neither (a) nor (b)

Answer: Option C

Explanation:

No answer description available for this question.

Question: A refractory wall separating the stock and the source of heat is provided in a
[A].

updraft kiln

[B].

muffle furnace

[C].

continuous furnace

[D].

none of these

Answer: Option B

Explanation:

No answer description available for this question.