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Worm gear is used, when two shafts are at _________

(a) Right angles to each other

(b) Some distance apart

(c) Radial direction

(d) 45 cm apart

This question was addressed to me in an internship interview.

This key question is from Mechanical Power Transmission topic in chapter Mechanical Power Transmission of Farm Machinery

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The correct answer is (a) Right angles to each other

For explanation: Worm gear is used when two shafts are at right angles but not intersecting to each other, not to be confused with bevel gear where the axis of two shafts are at right angles and can intersect each other.

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