Theory of Machine
The tractive force is maximum or minimum when the angle of inclination of crank with the line of stroke (θ) is equal to

90° and 180°
135° and 315°
0° and 90°
270° and 360°

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Theory of Machine
Pitch point on a cam is

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

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