With increase in moisture content of coal, its_____________________?
Correct answer: D. None of these
- A. Calorific value increases sometimes
- B. Bulk density always decreases
- C. Clinkering tendency during combustion increases
- D. None of these
Explanation
Moisture lowers the useful calorific value because part of the combustion heat is consumed in evaporating water. The other stated trends are not universally valid, so none of options a to c is correct.
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