Question

The relative velocity at outlet of impulse turbine compared to inlet relative velocity is

Answer 1

 In impulse turbines, when friction is neglected, the relative velocity of steam at outlet tip of the blade is  the relative velocity of steam at inlet tip of the blade.

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Answer 2

IMPULSE TURBINE

The relative velocity at outlet of impulse turbine compared to inlet relative velocity is same if friction is neglected.

DETAILED EXPLANATION ON IMPULSE TURBINE:

*An impulse turbine is made up of one or more fixed nozzles via which pressure is transferred to kinetic energy in the form of a liquid jet (usually water). The jet(s) collide with the turbine runner's moving plates, which absorb nearly all of the kinetic energy of the rushing water.

* High-head applications are best suited for impulse turbines. There is no change in pressure across the runner, according to one definition of an impulse turbine.

* In practice, the Pelton wheel  is the most popular impulse turbine. Its rotor is a circular disc with numerous buckets uniformly distributed around the circumference. Each bucket's splitter ridge separates the entering jet(s) into two equal pieces that flow around it.