Electrical Machines
In V/f speed control of 3-phase induction motor, with increase in frequency, the slip at which maximum torque occurs

None of these
 decrease.
 either of these.
 increase.

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

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

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