68) A simply supported beam AB carries a point load W at a point C at a distance less than half from the left end A. The maximum deflection will be

69) The projection in which the rectangular face of an object is projected as a parallelogram and the square face is projected as a rhombus, is

70) The method of dimensioning in which the dimensional figures are always written above the dimensional line at the centre and perpendicular to the dimension line is

71) The crystal structure of gamma iron is

72) The condition of unstable equilibrium of a floating body is where, M = metacentre, B = centre of buoyancy, G = centre of gravity