Theory of Machine
The primary unbalanced force is maximum when the angle of inclination of the crank with the line of stroke is

180° and 360°
90° and 180°
0° and 180°
0° and 90°

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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.

Any -ve value
Any +ve value
Infinity
Zero

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