Forced recirculation of furnace gases is practised_______________?
Correct answer: D. All A., B. and C.
- A. To increase heat transfer by convection
- B. To ensure uniform temperature
- C. In furnaces, operating below 750°C
- D. All A., B. and C.
Explanation
Forced gas circulation increases convective heat transfer and reduces temperature differences within the furnace. It is especially useful below about 750°C, where radiation is less dominant, so all three statements apply.
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