52) As per ISO designation for carbide tool inserts - S P U N 12 03 08, 'N' represents

53) The operation done on riveted joints to improve leak tighness

54) Ra value ( in micro meter) corresponding to roughness grade symbol N7 is

55) Calcute the turning time required to finish cut a mild steel rod of diameter 40mm for 100mm length in one pass, on a lathe with feed rate of 0.2mm/revolution and at a speed of 100 rpm?

56) What is the approximate radius of righ circular cylinder of height 100 mm which is cast from a cube of 100 mm size