50) The circumferential and longitudinal strains in a cylindrical boiler under internal steam pressure are ?_c and ?_l respectively. The change in volume of the boiler cylinder per unit volume will be

51) The bearings of heavy series have capacity __________ over the medium series.

52) A steel containing more than 0.8% carbon is known as eutectoid steel.

53) In leaf springs, the longest leaf is known as

54) The taper on cotter varies from