Theory of Machine
The train value of a gear train is

Always less than unity
Reciprocal of velocity ratio of a gear train
Equal to velocity ratio of a gear train
Always greater than unity

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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

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

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Theory of Machine
The maximum fluctuation of speed is the

Sum of maximum and minimum speeds
Variations of speed above and below the mean resisting torque line
Difference of minimum fluctuation of speed and the mean speed
Difference of the maximum and minimum speeds

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