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

Crown gear
Hooke's joint
Worm and wheel method
Compound gears

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

Through which the cam rotates during the period in which the follower remains in the highest position
Moved by the cam from the instant the follower begins to rise, till it reaches its highest position
Moved by the cam from beginning of ascent to the termination of descent
Of rotation of the cam for a definite displacement of the follower

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