The type of centrifugal pump preferred for a specific speed of 20 r.p.m. is

A Pelton wheel develops 1750 kW under a head of 100 meters while running at 200 r.p.m. and discharging 2500 liters of water per second. The unit speed of the wheel is

An orifice is said to be large, if

The maximum hydraulic efficiency of an impulse turbine is (where $$\varphi $$ = Angle of blade tip at outlet)

According to Darcy's formula, the loss of head due to friction in the pipe is (where f = Darcy's coefficient, $$l$$ = Length of pipe, v = Velocity of liquid in pipe and d = Diameter of pipe)

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