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

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

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Theory of Machine
Angle of dwell of cam is defined as the angle

Through which the cam rotates during the period in which the follower remains in the highest position
Of rotation of the cam for definite displacement of the follower
During which the follower returns to its initial position
Moved by the cam from the instant the follower begins to rise, till it reaches its highest position

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