Thermal efficiency of furnaces can be improved by____________________?
Correct answer: D. All A., B. and C.
- A. Waste heat recovery from flue gas
- B. Minimising heat losses from furnace walls
- C. Maintaining proper draught
- D. All A., B. and C.
Explanation
Furnace efficiency increases when useful heat is recovered from flue gases, wall losses are reduced by insulation, and draught is properly controlled. Since all three measures reduce fuel wastage or improve heat utilisation, option D applies.
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