Discussion
Assertion (A): Free lime content is measured on clinker several times a shift.
Reason (R): It responds quickly to changes in burning and gives early warning of a problem.
Answer: B
Both are true and the reason gives the purpose: the figure moves before the strength results do, so it lets the operator correct the kiln long before a batch of substandard cement has been made. Strength tests confirm the outcome only weeks afterwards.
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