Calculate the torque, Mechanical Engineering

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(a) Illustrate self-locking and self-energizing brakes.

(b) The diameter of the drum is 250mm and the angle of contact is 90o, If the operating force of 700 N is applied at the end of a lever and the coefficient of friction between the drum and the Lining is 0.35, calculate the torque that can be transmitted by the block brake.

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