Theory of Machine
A circle passing through the pitch point with its center at the center of cam axis is known as

Prime circle
Pitch circle
Base circle
Outer circle

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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
None of these
The algebraic sum of the secondary forces must be equal to zero
Both (A) and (B)

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