2. (a) Explain with appropriate figures the failure criteria based on maximum shear stress theory. Also draw its Mohr circle representation. 15 (b) A cylindrical shaft made of steel for which the tensile yield strength o = 550 MPa is subjected to static loads consisting of a bending moment of 700 kNmm and torsion of 400 kNmm. Determine the diameter of shaft for a factor of safety equal to 1.5 if E= 200 GPa and Poisson's ratio v = 0.25; Adopt maximum shear stress failure theory. 15 (c) Draw a network for the following situations : A is prerequisite on D (ii) B is prerequisite on D and E (iii) C is prerequisite on E (iv) D is prerequisite on F (v) E is prerequisite on F. 10