Discussion
Assertion (A): An extrusion die opening is not simply the shape of the required product.
Reason (R): Material flows faster through thicker parts of the section than through thin ones.
Answer: A
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. Uneven flow means the thick parts of the section run ahead and the thin parts lag, so the column bends or the section distorts. The die is therefore restricted where the flow would be fast and opened where it would be slow, which is why die design is empirical.
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