A) \[{{N}_{s}}\]
B) \[\sqrt{2}{{N}_{s}}\]
C) \[\frac{{{N}_{s}}}{\sqrt{2}}{{N}_{s}}\]
D) \[2{{N}_{s}}.\]
Correct Answer: B
Solution :
For a pump, \[{{N}_{s}}=\frac{N\sqrt{Q}}{{{H}^{3/4}}}\] \[{{N}_{s}}\propto \sqrt{Q}\] \[\frac{{{N}_{s2}}}{{{N}_{s1}}}=\frac{\frac{\sqrt{Q}}{2}}{Q}\] \[{{N}_{s2}}={{N}_{s2}}\frac{{{N}_{s}}}{\sqrt{2}}\]
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