The rake angle in drill

A $$50$$ $$mm$$ diameter disc is to be punched out from a carbon steel sheet $$1.0$$ $$mm$$ thick. The diameter of the punch should be (Take clearance as $$3\% $$ of sheet thickness)

The fit on a hole-shaft system is specified as $$H7$$-$$s6.$$ The type of fit is

If the two principal strains at a point are 1000 $$ \times $$ 10^-6 and -600 $$ \times $$ 10^-6, then the maximum shear strain is