The correct formula of specific speed of a hydraulic turbine under a head H rotating with speed N and giving power output as P is

1
\({P\sqrt N}\over H^{3/4}\)
2
\({\sqrt {NP}}\over H^{5/4}\)
3
\({N\sqrt P}\over H^{5/4}\)
4
\({NP}\over H^{3/4}\)

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