Theory of Machine
The swaying couple is due to the

Two cylinders of locomotive
Primary unbalanced force
Secondary unbalanced force
Partial balancing

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

Of rotation of the cam for a definite displacement of the follower
Through which the cam rotates during the period in which the follower remains in highest position
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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