Discussion
Assertion (A): A fine ceramic powder is granulated before it is dry pressed.
Reason (R): Fine powders do not flow and will not fill a die uniformly.
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 mechanism. A submicron powder is cohesive and will not flow into a die, so the fill is uneven and the compact varies in density. Spray drying builds it into free-flowing granules of tens of micrometres, which fill the die uniformly and then collapse under pressure.
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