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1. Safety reversal: All the garage door opener designed with safety reversal feature. The door has two sensors situated six inches over the floor level, each side with the door. When any object like pet, child or some different, call light beam developed by sensor whilst the door is closing, the door stops and reverses. If your opener haven't this safety reversal feature, put it back as soon as possible.
Generators have generally two basic parts named "Stator" and "Rotor". Mechanical energy is provided to the rotor of a generaotor by means of a prime mover (i.e. a turbine). Turbines are of different types like steam turbine, water turbine, wind turbine etc. Mechanical energy can also be provided by IC engines or similar other sources.
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