Material having negative co-efficient of linear expansion is

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.