Theory of Machine
Oldham’s coupling is an inversion of the kinematic chain used in

Rotary engine
Elliptical trammels
Whitworth quick return mechanism
Universal joint

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Theory of Machine
In order to give a complete secondary balance of a multi-cylinder inline engine,

The algebraic sum of the couples about any point in the plane of the secondary forces must be equal to zero
Both (A) and (B)
The algebraic sum of the secondary forces must be equal to zero
None of these

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Theory of Machine
Cam angle is defined as the angle

During which the follower returns to its initial position
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
Of rotation of the cam for a definite displacement of the follower

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