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

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

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Theory of Machine
Sensitiveness of the governor is defined as the ratio of the

Mean speed to the minimum equilibrium speed
Sum of the maximum and minimum equilibrium speeds to the mean speed
Mean speed to the maximum equilibrium speed
Difference of the maximum and minimum equilibrium speeds to the mean speed

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