• # question_answer A strip is to rolled from a thickness of 30 mm to 15 mm using a two-high mill having rolls of diameter 300 mm. The coefficient of friction for unaided bite should nearly be: A) 0.95                             B) 0.5C) 0.25                             D) 0.07

Bite angle, $\alpha ={{\tan }^{-\,1}}\mu$ $\cos \alpha =\frac{150-7.5}{150}=\frac{142.5}{150}=0.95$