2. Name and describe the different types of clutch with the help of net sketch, its working principle and giving at least one practical application for each. 3. What is a self-energizing brake? When a brake becomes self-locking 4. A single block brake, as shown in Fig 1 (a), has the drum diameter 720 mm. The angle of contact is 90° and the coefficient of friction between the drum and the lining is 0.35. If the torque transmitted by the brake is 70 N-m, find the force P required to operate the brake. 250-​