Electrical Machines
Maximum power will be developed when back emf is

 double the supply voltage.
 equal to supply voltage.
All of these
 half of the supply voltage.

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Electrical Machines
In the 3-phase induction motor, the resultant flux is of a constant nature and is

 1/2 times maximum value of flux due to any phase
 3/2 times maximum value of flux due to any phase
 3 times maximum value of flux due to any phase
 equal to φm, where φm is the maximum flux due to any phase

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Electrical Machines
In a DC generator, the armature reaction results in

 demagnetization of centers of poles.
  magnetization of inter poles.
 magnetization of leading and demagnetization of trailing pole tip.
  demagnetization of leading & magnetization of trailing pole tip.

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