Maximum efficiency of spiral gears - Theory of Machines - 2

Q.  Maximum efficiency of spiral gears is given as
- Published on 07 Aug 15

a. [cos ( θ + Φ) + 1] / [ cos ( θ – Φ) + 1]
b. [cos ( θ + Φ) – 1] / [ cos ( θ – Φ) – 1]
c. [sin ( θ + Φ) – 1] / [ cos ( θ – Φ) – 1]
d. [sin ( θ + Φ) – 1] / [ sin ( θ – Φ) – 1]

ANSWER: [cos ( θ + Φ) + 1] / [ cos ( θ – Φ) + 1]

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