Hemming is the operation: (a) In which the edges of the sheet are turned over to provide

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Hemming is the operation:

(a) In which the edges of the sheet are turned over to provide stiffness and a smooth edge.

(b) Of producing contours in sheet metal and bending previously roll formed sections.

(c) Employed to expand a tubular or cylindrical part.

(d) None of these

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