Calorific value of coal middling generated in coal washeries during washing of coal may be around _____________ Kcal/kg?
Correct answer: B. 4000
- A. 1000
- B. 4000
- C. 6000
- D. 8000
Explanation
Middlings contain more ash and less combustible matter than clean coal, so their calorific value is intermediate or relatively low. A typical value is about 4000 kcal/kg rather than 6000 or 8000 kcal/kg.
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