Q2// Water enters a hydraulic turbine through a 26 cm diameter pipe at a rate of 1.2 m^3/s and exits through a 21 cm diameter pipe. The pressure drop in the turbine is measured by a mercury manometer to be 2 m. For a combined turbine-generator efficiency of 91%. determine the net electric power output. Disregard the effect of the kinetic energy correction factors.

From a PPRC (shiny surface) pipe with an inner diameter of 20.5 mm and a length of 70 cm, water at 20 ° C flows at a flow rate of 1500 L / h and a pressure difference of 52 mbar occurs. Based on these data, find the speed of the water, the Re number, the friction factor, the f value and the pressure difference (in mbar) and show the f value you found from the Moody diagram. (For 20 ° C water; p = 998 kg / m3,µ= 1.003x10-3 N.s / m2, v = 1.005x10-6 m2 / s, 1 bar = 10.2141mSS)

A pump operates at 78% efficiency when it is pumping water (density = 1000 kg/m³) at a volume flow rate of 0.3 m³/s with a head of 17 m. The gravitational acceleration g = 9.81 m/s². The pump impeller's shaft power is kW.

When water is pumped into a water tank 20 m above a lake with a flow rate of 70 l/s, 20.4kW of electrical power is consumed. Determine the efficiency of the pump-motor group by ignoring the friction losses in the pipes and the change in kinetic energy. Determine the pressure difference between the inlet and outlet of the pump.