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

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

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Theory of Machine
Oldham's coupling is the

Third inversion of slider crank chain
Second inversion of double slider crank chain
Third inversion of double slider crank chain
Second inversion of single slider crank chain

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