A buildup of brake dust and dirt between the lining and the drum is the most common cause of a.  a. Concave/barrel-shaped drum b.Convex/tape red drum c.Threaded drum surface d.Scored drum surface

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Clutches, Brakes, Couplings, and Flywheels

The clutch is described as a machine element used to connect or disconnect two shafts together to transmit torque or power. The clutch works on the principles of friction. The clutch is commonly used in automobiles to transfer power from the driving shaft to the driven shaft.