147) To minimize the total cost of a roof truss, the ratio of the cost of truss to the cost of purlins shall be

148) Generally the purlins are placed at the panel points so as to avoid

149) For the buildings having a low permeability, the internal wind pressure acting normal to the wall and roof surfaces is taken as[where p is basic wind pressure]

150) The relation between intensity of wind pressure p and velocity of wind V is taken as

151) The live load for a sloping roof with slope 15°, where access is not provided to roof, is taken as