Overall thermal efficiency of a lumpy coal fired suitably designed heating furnace, if operated & maintained properly may be about ____________ percent?
Correct answer: B. 25-30
- A. 10-15
- B. 25-30
- C. 45-50
- D. 65-70
Explanation
Lumpy-coal furnaces lose substantial heat through hot flue gases, radiation, incomplete combustion, and furnace-wall losses, so their overall efficiency is commonly only about 25 to 30 percent. Values near 65 to 70 percent are more characteristic of highly efficient modern systems, not ordinary coal-fired furnaces.
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