A bracket is fixed to a vertical steel column by means of five standard bolts.

Determine : (a) The diameter of the fixing bolts, and (b) The thickness of the arm of the bracket.

Assume safe working stresses of 70 MPa in tension and 50 MPa in shear

Aplate clutch has a single pair of mating friction surfaces 250-mm od by 175-mm id. the mean value of the coefficient of friction is 0.30, and the actuating force is 4 kn. a) find the maximum pressure and the torque capacity using the uniform-wear model. b) find the maximum pressure and the torque capacity using the uniform-pressure model.

Thermal stresses are developed in a metal when its a) initial temperature is changed b) final temperature is changed c) density is changed d) thermal deformation is prevented e) expansion is prevented f) contraction is prevented

Burgers vector is generally parallel to the dislocation line. a)-true b)-false