For maximum blade efficiency of single stage impulse turbine (a) (holeft(=frac{u}{v_{a 1}} ight)=frac{cos ^{2} alpha_{1}}{2}) (b) (ho=cos

For maximum blade efficiency of single stage impulse turbine

(a) \(ho\left(=\frac{u}{v_{a 1}}\right)=\frac{\cos ^{2} \alpha_{1}}{2}\)

(b) \(ho=\cos \alpha_{1}\)

(c) \(ho=\frac{\cos \alpha_{1}}{2}\)

(d) \(ho=\cos ^{2} \alpha_{1}\)