If the rotational speed of a pump motor is reduced by 35%, what is the effect on the pump performance in terms of capacity, head, and power requirements?

4. A pump with 10in impeller diameter has a flow rate of 1200 gallons/min and a pump head of 61 ft when operated at 900 rpm. What speed and head would correspond for a pump in the same family with the same efficiency but a flow rate of 1500 gallons/min.

1) A pelton wheel is used to produce hydroelectric power. The average radius of the wheel is 1.83 m, and the jet velocity is 100 m/s from a nozzle of exit diameter equal to 10 cm. What is the volume flow rate through the turbine in m3/s? a) 263.02 b) 0.801 c) 78.54 d) 0.785 2) A water pump increases the pressure of the water passing through it (see picture below). The flow is assumed to be incompressible. If the outlet diameter is less than inlet diameter, which of the following about outlet and inlet fluid velocity is correct? a) Vout < Vin b) Vout > Vin c) Vout = Vin d) cannot be determined

For the figure shown, water flows at a rate of 2.5 ft3/s and the total head loss is equal to 61 times the velocity head in the pipeline. Diameter of the pipe is 8 inches throughout its length. Calculate the power (in horsepower) provided by the pump. Round off your answer into a whole number. Answer: P = P hp 50 ft