Theory of Machine
Which of the following governor is used to drive a gramophone?

Hartnell governor
Watt governor
Pickering governor
Porter governor

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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
In elliptical trammels

Two pairs turning and two pairs sliding
Three pairs turning and one pair sliding
One pair turning and three pairs sliding
All four pairs are turning

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