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

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

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Theory of Machine
In elliptical trammels

All four pairs are turning
Two pairs turning and two pairs sliding
Three pairs turning and one pair sliding
One pair turning and three pairs sliding

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