M

Mr. Dubey • 52.30K Points
Coach 

Q. In rolling operation, the roll rotates with surface velocity?

(A) exceeding the speed of incoming metal
(B) lower than the speed of incoming metal
(C) equal to speed of the incoming metal
(D) very higher than the speed of incoming metal
Correct : Option (C)

Explanation: 
 the rolls rotate with a surface velocity exceeding the speed of the incoming metal, friction along the contact interface acts to propel the metal forward. the metal is squeezed and elongated and usually changed in cross section.

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