For $$50\% $$ penetration of work material, a punch with single shear equal to thickness will

In a bending operation, If the modulus of elasticity $$E$$ is increased keeping all other parameters unchanged, the spring back will

In blanking operation, the best way to improve the smoothness and squarness of the edges is to

In producing a punched hole of $$20mm$$ diameter, the dimension of the punch is ........ given the radial die clearance of $$0.1mm.$$