Q. The hydraulic efficiency of an impulse turbine is maximum when :

A
The velocity of the wheel is half the velocity of the jet of water at inlet
B
The velocity of the wheel is double the velocity of the jet of water at inlet
C
The velocity of the wheel is equal to the velocity of the jet of water at inlet
D
The velocity of the wheel is three fourth of the velocity of the jet of water at inlet
Solution:
  • Theoretically, an impulse turbine can have a 100% efficiency if the speed of the incoming water jet is two times the speed of the bucket.
  • In this case, water will attain a zero velocity with respect to earth (stationary reference frame) and transfer all its energy to the turbine.
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