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 ?

7) To cut a cam that has a rise of 15 mm in 90 Degree rotation, if the table lead screw has a pitch of 6 mm, which one of the following is the gear ratio ?