Theory of Machine
The pair is known as a higher pair, when the relative motion between the elements of a pair is

Partly turning and partly sliding
Rolling only
Turning only
Sliding only

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Theory of Machine
The contact ratio is given by

(Length of the arc of approach)/cosφ
(Length of the arc of contact)/(Circular pitch)
(Length of path of recess)/(Circular pitch)
(Length of the path of approach)/(Circular pitch)

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Theory of Machine
The maximum fluctuation of energy is the

Difference between the maximum and minimum energies
Sum of the maximum and minimum energies
Variations of energy above and below the mean resisting torque line
Ratio of the mean resisting torque to the work-done per cycle

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