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

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

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Theory of Machine
The relation l = (2/3).(j + 2) apply only to kinematic chains in which lower pairs are used. This may be used to kinematic chains in which higher pairs are used, but each higher pair may be taken as equivalent to

Any one of these
Two lower pairs and one additional link
Two lower pairs and two additional links
One lower pair and two additional links

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