When right hand helix is to be cut, the table of milling machine should be swivelled :

3) To what angle must the milling machine table be swivelled to cut a helix having a lead of 10.882 in a piece of workpiece of Dia 2" ?

4) To what angle must the milling machine table be swivelled to cut a helix having a lead of 450 mm on a workpiece of Dia 40 mm.

5) Which one of the following is a positive cam ?

6) Which among the following is a non-positive cam ?