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

180° and 270°
90° and 180°
270° and 360°
45° and 225°

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Theory of Machine
Inertia force acts

Perpendicular to the acceleration force
Along the direction of acceleration force
Opposite to the direction of acceleration force
None of the listed here

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