Answer Happy

With respect to a horizontal axis wind turbine, which of the following statements are true? Select one or more: The yaw mechanism is the primary way of setting the angle of attack of the blades. The pitch mechanism is need to point the turbine into the wind. The yaw mechanism is need to point the turbine into the wind. The yaw mechanism is useful to reduce the power output in strong wind conditions. The pitch mechanism is useful to reduce the power output in strong wind conditions. The pitch mechanism is the primary way of setting the angle of attack of the blades.
Suppose that you have a wind turbine that is operating at 41% total efficiency, with a wind speed of 25 km/hour and an air density of 0.51 kg/m^3. Which of the following would be possible ways of roughly doubling the electrical power output of the turbine? Select one or more: Increasing the wind speed to 50 km/hour Increasing the wind speed to 31 km/hour Doubling the number of blades on the turbine. Increasing the air density to 1.02 kg/m^3 O Increasing the overall efficiency from 41 to 82%.