Theory of Machine
Which type of gearing is used in steering system of an automobile?

Rack and pinion
Spiral gears
Worm and wheel
None of the listed here

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Theory of Machine
The contact ratio is given by

(Length of the arc of approach)/cosφ
(Length of path of recess)/(Circular pitch)
(Length of the path of approach)/(Circular pitch)
(Length of the arc of contact)/(Circular pitch)

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