1) what are the geometries of cnc lathe, vmc machine 2) how to calculate feed ,speed, rpm , spindle power. 3) How to change bearing of ball screw. 4) what are types of bearings and their angles for angular bearing, what types of combination used in machines 5) what are the causes of taper in turning part , taper in face of turned part 6) what are the diff parts connected to i/o board 7) If we turn plate on face on cnc lathe will it be straight , concave or convex (my fav question though i didnt know ans at that time) 8) How plc ladder logic works 9) what types of bearings used in spindle bearings