Mean diameter or the pitch diameter (D) of the Pelton Wheel which rotates at N r.p.m. is given by

(where, Ku is the speed of rotation and H is the net head)

This question was previously asked in
BPSC AE Paper IV General Engineering 19 Dec 2024 Official Paper
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Answer (Detailed Solution Below)

Option 1 :
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BPSC AE सामान्य हिंदी Mock Test
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Detailed Solution

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Concept:

The pitch diameter of a Pelton wheel is calculated by equating the tangential velocity derived from geometry and speed ratio. The tangential velocity is:

and also

Equating both:

Final Answer:

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