Discussion
Assertion (A): A clinker can be burnt too hard as well as too little.
Reason (R): Overburning enlarges the crystals and makes the clinker more difficult to grind.
Answer: A
Correct answer: Both A and R are true, and R is the correct explanation of A
Both are true and the reason gives the mechanism. Underburning leaves free lime and unreacted belite; overburning grows large well-formed crystals which are hard to grind and which hydrate more slowly. The optimum is a burning zone hot enough to combine the lime and no hotter, which is why free lime is monitored continuously as the control variable.
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