Thermal efficiency of an open hearth furnace may be about _____________ percent?
Correct answer: B. 20
- A. 5
- B. 20
- C. 50
- D. 80
Explanation
Open-hearth furnaces have substantial heat losses through flue gases, walls, openings, and incomplete heat recovery, so their overall thermal efficiency is commonly around 20%. Values such as 50% or 80% are too high for this furnace type.
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