A hydraulic turbine-generator unit placed at the bottom of a 75-m-high dam accepts water at a rate

Question:

A hydraulic turbine-generator unit placed at the bottom of a 75-m-high dam accepts water at a rate of 1020 L/s and produces 630 kW of electricity. Determine
(a) The overall efficiency of the turbine-generator unit.
(b) The turbine efficiency if the generator efficiency is 96 percent.
(c) The power losses due to inefficiencies in the turbine and the generator.