61) Calculate the amount of offset of tail stock for turning taper on full length of a job 12 inch long which is to have its two diameters as 2 inch and 1.5 inch ultimately.

62) A body in space free from all restraints have _____ degrees of freedom

63) The quick helix drill should never be used to drill

64) If the lead screw has 6 T.P.I. and if there are 4 numbered divisions in the chasing dial, the number of teeth in the worm wheel of the casting dial will be

65) For selecting the gears required to cut a 3 mm pitch thread on a job in a lathe having a lead screw of 6 mm pitch and a driver gear of 60 deeth, the driven gear shall have _____ number of teeth.