Q. 65 A rectangular hole of size
is to be made on a 5 mm thick sheet
of steel having ultimate tensile strength and shear strength of 500 MPa and 300
MPa, respectively. The hole is made by punching process. Neglecting the effect of
clearance, the punching force (in kN) is
(A) 300
(B) 450
(C) 600
(D) 750
Answer: (B)
Explanation:
