Theory of Machine
The absolute acceleration of any point ‘P’ in a link about center of rotation ‘O’ is

Along PO
None of the listed here
At 45° to PO
Perpendicular to PO

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Theory of Machine
Hammer blow

Is the maximum horizontal unbalanced force caused by the mass provided to balance the reciprocating masses.
Varies inversely with the square of the speed
Varies as the square root of the speed
Is the maximum vertical unbalanced force caused by the mass added to balance the reciprocating masses

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Theory of Machine
The inversion of a mechanism is

Obtained by fixing different links in a kinematic chain
Turning its upside down
Obtained by reversing the input and output motion
Changing of a higher pair to a lower pair

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