165) The minimum thickness of plates in a steel stack should be

166) Maximum pitch of rivets, used in steel stacks, is limited to [where t is thickness of thinner plate being connected]

167) The diameter of base of conical flare of a steel stack is[where d is the diameter of the cylindrical part]

168) Hudson′s formula gives the dead weight of a truss bridge as a function of

169) If the loaded length of span in meters of a railway steel bridge carrying a single track is 6 m, then impact factor is taken as