For maximum blade efficiency of a single-stage impulse turbine, the blade speed ratio, (\[\alpha \] is the angle made by absolute velocity at inlet) should be:

For maximum blade efficiency of a single-stage impulse turbine, the bl

1.	For maximum blade efficiency of a single-stage impulse turbine, the blade speed ratio, (\[\alpha \] is the angle made by absolute velocity at inlet) should be:
A.	\[\cos \,2\alpha \]
B.	\[\frac{\cos \,2\alpha }{2}\]
C.	\[\frac{\cos \alpha }{2}\]
D.	\[\frac{2}{\cos \alpha }\]
Answer» D. \[\frac{2}{\cos \alpha }\]

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For maximum blade efficiency of a single-stage impulse turbine, the blade speed ratio, (\[\alpha \] is the angle made by absolute velocity at inlet) should be:

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