Circulation of gases in furnace is caused by the

Question: Circulation of gases in furnace is caused by the
[A].

change in volume during a change of temperature.

[B].

difference in density between hot and cold gases.

[C].

furnace pressure in conjunction with draft in flues.

[D].

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

Answer: Option D

Explanation:

No answer description available for this question.