Theory of Machine
Klein's construction gives a graphic construction for

Four bar chain mechanism
Velocity polygon
Acceleration polygon
Slider-crank mechanism

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Theory of Machine
Inertia force acts

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

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

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