Theory of Machine
The unbalanced force due to revolving masses

Varies in direction but constant in magnitude
Varies in magnitude but constant in direction
Constant in magnitude and direction both
Varies in magnitude and direction both

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Theory of Machine
In a mechanism, the fixed instantaneous centers are those centers which

None of the listed here
Remain in the same place for all configurations of the mechanism
Vary with the configuration of the mechanism
Moves as the mechanism moves, but joints are of permanent nature

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Theory of Machine
In the below figure, PC is the connecting rod and OC is the crank making an angle θ with the line of stroke PO and rotates with uniform angular velocity at ω rad/s. The Klien's acceleration diagram for determining the acceleration of the piston P is shown by quadrilateral CQNO, the acceleration of the piston is _________ when the crank OC and connecting rod PC are at right angles to each other.

Infinity
Any +ve value
Any -ve value
Zero

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