Theory of Machine
Klein's construction can be used to determine acceleration of various parts when the crank is at

Outer dead centre
Right angles to the link of the stroke
Inner dead centre
All of the listed here

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

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
The algebraic sum of the secondary forces must be equal to zero
None of these

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