question_answer

Which of the following assumptions are correct for cold rolling?

(1) The material is plastic

(2) The arc of contact is circular with a radius greater than the radius of the roil.

(3) Coefficient of friction is constant over the arc of contact and acts in one direction throughout the arc of contact.

Select the correct answer using the code given below:

Codes:

A) 1 and 2            

B) 1 and 3

C) 2 and 3            

D) 1, 2 and 3