Maximum thermal efficiency of boiler may be about _____________ percent?
Correct answer: D. 90
- A. 10
- B. 25
- C. 65
- D. 90
Explanation
Modern well-designed boilers can transfer roughly 80 to 90% of the fuel heat to the steam, so about 90% is a reasonable maximum. Values such as 10 or 25% are far too low for boiler efficiency.
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