Discussion
Assertion (A): A part that distorts during firing may have been faulty before it entered the kiln.
Reason (R): Density gradients established during pressing cause differential shrinkage on sintering.
Answer: B
Both are true and the reason traces the fault upstream: the kiln reveals the non-uniformity rather than creating it, so the remedy lies in the pressing operation rather than in the firing schedule. Kiln settings cannot correct a gradient built in at the press.
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