Theory of Machine
Which of the following statement is correct for involute gears?

The interference is inherently absent.
The variation in centre distance of shafts increases radial force.
The pressure angle is constant throughout the teeth engagement.
A convex flank is always in contact with concave flank.

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Theory of Machine
The maximum fluctuation of energy is the

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

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Theory of Machine
Higher pairs are those which have

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

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