The water in a jet propelled boat is drawn through the openings facing the direction of motion of the boat. The efficiency of propulsion is given by

  • A2V/(vr - v)
  • B2V/(vr + v)
  • CV/(vr - v)
  • DV/(vr + v)
Correct Answer : (B)

2V/(vr + v)

Hints :

According to Bernoulli's equation for steady ideal fluid flow


A Francis turbine is used when the available head of water is

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