Theory of Machine
The angle of inclination of the plane, at which the body begins to move down the plane is called

Angle of friction
None of these
Angle of repose
Angle of projection

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

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

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