The maximum efficiency for spiral gears in mesh is given by (where (theta=) shaft angle and (phi=)
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The maximum efficiency for spiral gears in mesh is given by (where \(\theta=\) shaft angle and \(\phi=\) friction angle)
(a) \(\frac{1+\cos (\theta-\phi)}{1+\cos (\theta+\phi)}\)
(b) \(\frac{1+\cos (\theta+\phi)}{1+\cos (\theta-\phi)}\)
(c) \(\frac{1-\cos (\theta-\phi)}{1+\cos (\theta+\phi)}\)
(d) \(\frac{1-\cos (\theta+\phi)}{1+\cos (\theta-\phi)}\).
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