Minimum thermal efficiency of a steam boiler may be around ____________________ percent ?
Correct answer: D. 20
- A. 25
- B. 45
- C. 65
- D. 20
Explanation
Very inefficient or older steam boilers may have thermal efficiencies near 20%, although modern boilers are usually much more efficient. The figure is therefore a lower-end approximate value rather than a normal modern-boiler efficiency.
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