Circulation of gases in furnace is caused by the_________________?
Correct answer: D. All A., B. and C.
- 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.
Explanation
Gas circulation may result from thermal expansion, density differences between hot and cold gases, and pressure differences produced by the furnace and flue draft. Hence all three listed mechanisms contribute.
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