Ahead is to be designed to operate a mean head of 205m and to be supplied by a catchment area of 1000km² with an annual rainfall of 125cm³ of which 80% is available for power generation. the expected load factor is 75% at the plant. allowing a head loss of 5m and assuming the turbine efficiency and generator to be 90% and 95% respectively, calculate the suitability in megawatts rating of the station

Asolid cylinder is concentric with a straight pipe. the cylinder is 0.5 m long and has an outside diameter of 8 cm. the pipe has an inside diameter of 8.5 cm. the annulus between the cylinder ad the pipe contains stationary oil. the oil has a specific gravity of 0.92 and a kinematic viscosity of 5.57 x 10-4 m2/s. most nearly, what is the force needed to move the cylinder along the pipe at a constant velocity of 1 m/s?