EMM 301: Mechanics of Machines I Third Trimester Examination

Mechanisms paper that opens on the Aronhold Kennedy theorem and the instantaneous centre of rotation, then locates the instantaneous centres of a pin-jointed four bar mechanism and finds the angular velocity of a link. Determines the ratio of cutting to return time of a crank and slotted lever shaper from the centre distance and crank radius, and works a toggle mechanism for the velocity of the slider, the angular velocities of three links, the rubbing velocities at two pins, the crank torque for a given force and the angular acceleration of a link. Continues with the torque transmitted by a cone clutch under uniform pressure and uniform wear, the mean radius and face width of a single dry plate clutch, the named parts of a spur gear, the derivation of the length of the path of contact and the contact ratio of a pinion and wheel. Closes on chain drives against belt drives and the torque, power, friction loss and efficiency of an open belt drive.