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

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Q. Circulation of gases in furnace is caused by the

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