Theory of Machine
Transmission of power from the engine to the rear axle of an automobile is by means of

Crown gear
Hooke's joint
Compound gears
Worm and wheel method

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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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