Theory of Machine
The indicator using Watt mechanism is known as

Thompson indicator
Thomson indicator
Richard indicator
Simplex indicator

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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

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

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Theory of Machine
A point B on a rigid link AB moves with respect to A with angular velocity ω rad/s. The total acceleration of B with respect to A will be equal to

Vector difference of radial component and tangential component
Vector sum of radial component and tangential component
Vector sum of radial component and Coriolis component
Vector sum of tangential component and Coriolis component

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