• In blanking and punching process, select the correct diameter for the die (Db for blanking and Dpfor punching), if the designed feature needs the diameter of 0.5 m, and

the clearance is 0.1m: a) Db=0.5 m, Dp=0.7 m; b) Db=0.3 m, Dp=0.5 m; c) Dp=0.7 m, Dp=0.5 m; d) Db=0.5 m, Dp=0.3 m