Question:-
Assertion (A): If the helix angle of a helical gear is increased, the load carrying capacity of the tooth increases.
Reason (R): The form factor of a helical gear increases with the increase in the helix angle
Option (A)
Both A and R are true and R is the correct explanation of A
Option (B)
Both A and R are true but R is NOT the correct explanation of A
Option(C)
A is true but R is false
Option(D)
A is false but R is true
Correct Option:
(A)
Question Solution:
Fb (beam strength) = s.mn.Y’
Y’ = lewis form factor based on virtual number of teeth
Z’ = (Z/cos3y) as y ↑, cos3 y decreases as Z’ ↑, Y’↑
[because Y’ = 0.484 – (2.87/Z’p)]
Therefore Fb ↑ .Y’ given from factor.
question-answer-faq-9320