Theory of Machine
A friction circle is a circle drawn when a journal rotates in a bearing. Its radius depends upon the coefficient of friction and the

Radius of journal
Angular velocity of journal
Magnitude of the forces on journal
Clearance between journal and bearing

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

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

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