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

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

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Theory of Machine
A system of masses rotating in different parallel planes is in dynamic balance if the

Resultant couple is equal to zero
Resultant force is equal to zero
Resultant force and resultant couple are both equal to zero
Resultant force is numerically equal to the resultant couple, but neither of them need necessarily be zero

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