23) Point angle of chisel for aluminium is

24) Pitch of a hacksaw blade for cutting soft materials like bronze and brass is _____ mm

25) Blank size for M10 x 1.0 external thread using a die is

26) The operation done on riveted joints to improve leak tightness is

27) If l is length of cut, n is number of cuts, N is rpm, and f is feed, the turning time T is given by