GATE 2017

Question

In order to have maximum power from a Pelton turbine, the bucket speed must be –

a) equal to the jet speed

b) equal to half of the jet speed

c) equal to twice the jet speed

d) independent of the jet speed

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Engineering Kamal Kumar 8 months 2 Answers 157 views 0

Answers ( 2 )

  1. In order to have maximum power from a Pelton turbine, the bucket speed must be Equal to half the jet speed. Since, velocity of bucket = ½ times the velocity of jet.

  2. The correct answer is option (b).
    The bucket speed must be half of the jet speed in order to have maximum power from a Pelton Turbine.
    When we formulate the equation of power, we get P= 2ρQ(v-u)u. For maximum power, derivative of power with respect to u must be zero. This calculation results into u=v/2.

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