Theory of Machine
The power from the engine to the rear axle of an automobile is transmitted by means of

Hooke's joint
Worm and worm wheel
Spur gears
Bevel gears

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Theory of Machine
In a cam drive with uniform velocity follower, the sharp corners of the displacement diagram are rounded off at the beginning and at the end of each stroke. This is done

Because of difficulty in manufacturing cam profile
Because the uniform velocity motion is a partial parabolic motion
In order to have acceleration in beginning and retardation at the end of stroke within the finite limits
Because of loose contact of follower with cam surface

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