Which of the following statement about efficiency of impulse turbines is TRUE, when the blade speed ratio is made equal to half of cosine of the nozzle angle?

Efficiency is minimum and is equal to ( frac{cos u2061 ^2}{2} )

Efficiency is maximum and is equal to ( frac{cos u2061 ^2}{2} )

Efficiency is minimum and is equal to cos u2061 2

Efficiency is maximum and is equal to cos u2061 2

Which of the following statement about efficiency of impulse turbines

1.	Which of the following statement about efficiency of impulse turbines is TRUE, when the blade speed ratio is made equal to half of cosine of the nozzle angle?
A.	Efficiency is minimum and is equal to ( frac{cos u2061 ^2}{2} )
B.	Efficiency is maximum and is equal to ( frac{cos u2061 ^2}{2} )
C.	Efficiency is minimum and is equal to cos u2061 <sup>2</sup>
D.	Efficiency is maximum and is equal to cos u2061 <sup>2</sup>
Answer» E.

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Which of the following statement about efficiency of impulse turbines is TRUE, when the blade speed ratio is made equal to half of cosine of the nozzle angle?

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