1.

The maximum value of efficiency for a Parson’s reaction turbine is _____

A. \(\frac{2(cos⁡)^2}{1+(cos ⁡α)^2} \)
B. \(\frac{2(cos α)^2}{1+(cos ⁡α)^2} \)
C. \(\frac{1+(cos ⁡α)^2}{2(cos α)^2} \)
D. \(\frac{2(cos α)^2}{1+(cos ⁡α)^2} \)
Answer» E.


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