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How does the contact ratio of helical gears compare with that of spur gears?

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How does the contact ratio of helical gears compare with that of spur gears?

            (a) It is lesser than that of spur gear    (b) It is greater than that of spur gear

            (c) Infinite                                           (d)It is equal to that of spur gear

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answered by (180 points)
CR of helical gear is more than that of spur gear.

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