Theory of Machine
Whitworth quick return mechanism is obtained by inversion of

Slider crank mechanism
Roller cam mechanism
Five link mechanism
Kinematic chain

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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.
The pressure angle is constant throughout the teeth engagement.
A convex flank is always in contact with concave flank.
The interference is inherently absent.

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