Theory of Machine
Tangential acceleration direction is

Opposite to angular velocity
May be any one of these
Along the angular velocity
Perpendicular to angular velocity

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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 two additional links
One lower pair and two additional links
Two lower pairs and one additional link

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Theory of Machine
In a four bar chain or quadric cycle chain

Each of the four pairs is a turning pair
Three are turning pairs and one is a sliding pair
Two are turning pairs and two are sliding pairs
One is a turning pair and three are sliding pairs

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