Overall efficiency of a centrifugal pump is the ratio of a. Energy available at the impeller to the energy supplied to the pump by the prime mover b. Actual work done by the pump to the energy supplied to the pump by the prime mover c. Energy supplied to the pump to the energy available at the impeller d. Manometric head to the energy supplied by the impeller per Newton of water

Does Mary have a valid concern about the pump?

Problems 2.196 and 2.197 A micro spiral pump consists of a spiral channel attached to a stationary plate. This late bas two ports, one for fluid inlet and another for outlet, the outlet being farther from che center of the plate than the inlet. The system is capped by a rotating disk. The fluid anned between the rotating disk and the stationary plate is put in motion by the rotation of the top disk, which pulls the fluid through the spiral channel. spin axis rotating disk- inlet pin joint- outlet spiral groove stationary plate- Figure P2.196 and P2.197 Problem 2.197 Consider a spiral channel with the geometry given by the equation r= n0 +ro, where n = 12 um is called the polar slope, ro = 146 um is the starting radius, r is the distance from the spin axis, and 6, measured in radians, is the angular position of a point in the spiral channel. If the top disk rotates with a constant angular speed w = 30,000 rpm, and assuming that the fluid particles in contact with the rotating disk are…

For a hydroelectric plant, a hydraulic turbine-generator is installed at the site below the free surface. The turbine drives a generator for electricity.  The elevation difference between the two free surfaces is  . The power input from the fluid to the turbine is is . The shaft power output from the turbine is . (3) Calculate the the efficiency of the turbine,  __________%