Theory of Machine
The Whitworth quick return motion mechanism is formed in a slider crank chain when the

Longest link is a fixed link
Slider is a fixed link
Coupler link is fixed
Smallest link is a fixed link

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Theory of Machine
Open pairs are those which have

Point or line contact between the two elements when in motion
Two elements that permit relative motion
Surface contact between the two elements when in motion
Elements of pairs not held together mechanically

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Theory of Machine
In order to give a complete secondary balance of a multi-cylinder inline engine,

The algebraic sum of the secondary forces must be equal to zero
Both (A) and (B)
The algebraic sum of the couples about any point in the plane of the secondary forces must be equal to zero
None of these

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