Discussion
Assertion (A): Refractory bodies contain a high proportion of pre-fired filler.
Reason (R): Material that has already been fired contributes no further shrinkage of its own.
Answer: B
Correct answer: Both A and R are true, and R is the correct explanation of A
Both are true and the reason gives the purpose. Grog, chamotte and calcined alumina have already undergone their shrinkage, so they occupy their final volume and only the bonding clay around them shrinks. That keeps the total shrinkage low and even, which is what allows large refractory shapes to be made without cracking, and it opens the texture so that drying and firing gases can escape.
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