In a muffle furnace, the muffle_________________?

Question: Hearth furnaces are not used for
[A].

roasting

[B].

melting

[C].

reheating

[D].

none of these

Answer: Option D

Explanation:

No answer description available for this question.

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: Overall thermal efficiency of a lumpy coal fired suitably designed heating furnace, if operated & maintained properly may be about __________ percent.
[A].

10-15

[B].

25-30

[C].

45-50

[D].

65-70

Answer: Option B

Explanation:

No answer description available for this question.