A pump operated by an electric motor is designed to deliver 120 liters per second of diesel fuel (SG = 0.82) with a pump efficiency of 82%. The suction pressure gage reads 12 psi, 28.0 inches above the pump centerline and a discharge pressure gage of 28 psi, 12 feet above the pump centerline. The diameter at the suction and discharge of the pipe are 8.2 in and 4.8 in, respectively. If the friction losses are accounted to 28% of the velocity head, determine and the motor efficiency (%). The power needed to operate the motor is 30 kW.

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Applied Fluid Mechanics

A fluid is a substance that is continuously deformed by the application of shear stress. The rate of deformation of a fluid depends on its viscosity. The fluid tries to flow when it interacts with some other system.