Discussion
Assertion (A): The temperature of a kiln shell is monitored continuously along its length.
Reason (R): A hot spot indicates that the protective coating or the refractory has been lost.
Answer: C
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. A scanner traverses the shell continuously and plots its temperature along the length. Where coating or brick has gone, the steel is no longer insulated and its temperature rises sharply - so the scan sees the loss immediately, long before the shell itself is damaged.
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