The water in a large lake is to be used to generate electricity by the installation of a hydraulic turbine-generator at a location where the depth of the water is 50 m. water is to be supplied at a rate of 5000 kg/s. if the electric power generated is measured to be 1862 kw and the generator efficiency is 95 percent, determine (a) the overall efficiency of the turbine-generator, (b) the mechanical efficiency of the turbine, and (c) the shaft power supplied by the turbine to the generator.

a) 0.76

b) 0.80

c) 1964 kW

Explanation:

GIVEN DATA:

Assume Mechanical energy at exist is negligible

A) Take lake bottom as reference, and then kinetic and potential energy  are taken as zero.

change in mechanical energy is givrn as

                         = 0.491 kJ/kg

B)

c)

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