f) Which pitch angle would produce the greatest output from the wind turbine? 1- 15° 2- 30° 3- 45° 4- 60°

1.The wind turbine gives the following data: Blade length, 1 = 52 m, Wind speed, V= 12 m/s, Air density, wind and power available in the rotor. = 1.23 kg/m³, Power Coefficient, C,= 0.4, Calculate the power in the 2.A Site evaluated for a wind farm is observed to have steady winds at a speed of 8.5m/s. Determine the wind energy (a) per unit mass, (b) For a mass of 10 kg and (c) For a flow rate of 1154 kg/s of air. 3.The nominal power of the wind turbine is 3MW at wind speed 11.5m/s, generator efficiency is 94%, gear box efficiency is 0.75, power coefficient of blades is 0.59. What would be the diameter of the rotor?

Situation #6: A steel marine propeller is to transmit 4.5 MW at 3 r/s without exceeding a shearing stress of 50 MPa or twisting through more than 1° in a length of 25 diameters. Find the proper diameter if G 83 GPa.

Calculate the turbine power with the following data - Blade length, I = 50 m , Wind Speed, v = 10 m/sec , Air density, p = 1.23 kg/m^3 , Power Coefficient, Cp = 0.5. Also, give any three characteristics of wind mills designed to tackle heavy wind load.

Q2/ The 150 box being pulled in 14 sec by the M winch M, If the winch efficiency is e = 0.65 and the power input is 20 Kw. Determine the speed of the box if the coefficient of kinetic friction between the box and the plane is uk = 0.2.

A large commercial wind turbine has a blade span of 100 m and tower (4 m diameter uniform) height of 150 m high (hub height above the ground). If the combined turbine-generator efficiency of 40%, wind speed of 15 km/h and the air density 1.2 kg/m3 (disregard frictional effects on the mast) determine the following:a) Electrical power generated by the turbine (in MW).b) Total horizontal force (kN) exerted by the wind on the supporting mast of the turbine and the distance (m) of this resultant force from the ground. Assume uniform tower diameter throughout the height.c) What will be the electrical power generated (in MW) when the wind speed is 30 km/h

A wind turbine with an extraction ratio (torque power/drag power) of 1.05 rotates at 0.53 rad/s in a wind with velocity 16m/s. The disc area is 345 sq m and the torque generated is 814 kNm. Taking air density as 1.20 kg/m/m/m, calculate the advance angle at the blade tip, assuming flow arrives at the disc axially. Express your answer in degrees.

The wind turbine (60 meter diameter) is at sea level, but it is ina windier place. How much total power would it receive from thewind if it blowing at 20 meters per second?Why can’t a wind turbine with 60 meter blades actually producethis much power in 20 m/s winds?

4. A tubular steel [G= 80 GPa] shaft with an outside diameter of D = 100 mm and a wall thickness of t = 6 mm must not twist more than 0.05 rad in a 7-m length. Determine the maximum power that the shaft can transmit at 375 rpm.