69. A machine powered by rotating blades is a A.Fumerole B.Turbines C.Solar panel D.None of the above
Option B Solution: A machine powered by rotating blades is a turbines. A turbine is a device that harnesses the kinetic energy of some fluid - such as water, steam, air, or combustion gases - and turns this into the rotational motion of the device itself.[2] These devices are generally used in electrical generation, engines, and propulsion systems and are classified as a type of engine.
