Question
Download Solution PDFIdentify the false statement from the following:
The specific speed of the turbine increases with _______
Answer (Detailed Solution Below)
Detailed Solution
Download Solution PDFConcept:
The specific speed of a turbine is defined as, the speed of a geometrically similar Turbine that would develop unit power when working under a unit head (1m head). Is prescribed by the relation
\({N_s} = \frac{{N\sqrt P }}{{{H^{\frac{5}{4}}}}}\)
For Pump, \({N_s} = \frac{{N\sqrt Q }}{{{H^{\frac{3}{4}}}}}\)
Where,
Ns = specific speed, N = speed in rpm, P = power generated, and H = total head developed by the turbine.
Clearly from the formula, it can be stated that
\({{\rm{N}}_{\rm{S}}} ∝ \frac{{{\rm{1}} {\rm{}} }}{{{{\left( {\rm{H}} \right)}^{\frac{5}{4}}}}}\)
Specific speed will decrease if H increases.
Also,
As gravity acceleration decreases the resistance decreases; discharge increases and hence specific speed increases.
Mistake Points It has been asked to identify the false statement from the given options
Last updated on May 28, 2025
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