Theory of Machine
The type of pair formed by two elements which are so connected that one is constrained to turn or revolve about a fixed axis of another element is known as

Spherical pair
Sliding pair
Rolling pair
Turning pair

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Theory of Machine
Pitch point on a cam is

Any point on pitch curve
Any point on pitch circle
The point on cam pitch curve having the minimum pressure angle
The point on cam pitch curve having the maximum pressure angle

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