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It is desired to predict the performance of a large centrifugal pump from that of a scale model one fourth the diameter. The model absorbs 20 HP when pumping under test head of 20 m at its best speed of 400 r.p.m. The large pump is required to pump against 60 m head. The following will be the speed of the pump

[A].	100 RPM	[B].	153 RPM
[C].	167 RPM	[D].	173 RPM
[E].	208 RPM

Answer: Option D

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