Answer / rajesh

Actually the type of flux produced in the rotor after
giving excitation (dc current)is constant.then the rotot
will be rotated by a Motor or turbine will cause emf
induced inthe rotor. if we give ac current to the rotor the
flux is variabe and cause emf induced in the stator and
start it will act as a motor. but we are forcely rotating
roator by turbine the rate of change of flux will be
zero.so that there is no emf will induce.

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