Angles in worm, spiral & helical gear - Theory of Machines - 2

Q.  Which of the following statements is/are true?
- Published on 07 Aug 15

a. Lead angle of worm and spiral angle of worm wheel should be equal
b. Worm and worm gear have shaft angle of 90o
c. Helical gears have opposite hand of helix when two teeth mesh
d. All of the above

ANSWER: All of the above

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