For maximum efficiency of a Parson's reaction turbine, the speed ratio is equal to: (a) (frac{cos alpha}{2})

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For maximum efficiency of a Parson's reaction turbine, the speed ratio is equal to:

(a) \(\frac{\cos \alpha}{2}\)

(b) \(\cos \alpha\)

(c) \(\cos ^{2} \alpha\)

(d) \(\frac{\cos ^{2} \alpha}{2}\)

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