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I am hoping to take the exam this fall if I get approved (all paperwork has been mailed in).

Ok, in the EPRM manual (Camara) p. 42-13 section 20, he seems to say that variable speed control is most often done by introducing a foreign voltage into the secondary (rotor) circuit to oppose the induced voltage in the rotor. He also says that it is impractical to change the supply frequency...