136) If the lead screw has 6 TPI and there are 4 numbered divisions in the chasing dial, which one of the following will be the teeth worm wheel of chasing dial ?

137) While thread cutting on a lathe by using single-point tool, the tool moves in a path called as

138) To enable a nut to fit properly on a bolt of square threads, the width of the internal square threading tool should be

139) For cutting acme threads, the threading tool should be ground to an included angle of

140) The tip of a cemented carbide tool is joined on the shank by