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 ?

8) A cam whose rise is 23.5 mm in 83 Degree is to be cut using a vertical milling machine, calculate the inclination of spindle.

9) The maximum swiveling of the table of universal milling machine is :