Theory of Machine
In a turning moment diagram, the variations of energy above and below the mean resisting torque line is called

Coefficient of fluctuation of energy
None of the listed here
Fluctuation of energy
Maximum fluctuation of energy

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Theory of Machine
Kinematic pairs are those which have

Elements of pairs not held together mechanically
Surface contact between the two elements when in motion
Point or line contact between the two elements when in motion
Two elements that permit relative motion

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