Electrical Machines
The low voltage winding of a 400/230 V single phase 50 Hz transformer is to be connected to keep the magnetization current at the same level in both the cases the voltage at 25 Hz should be

 65 V
 115 V
 460 V
 230 V

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Electrical Machines
The armature mmf of a DC machine has

  triangular space distribution and is stationary in space.
 stepped distribution and rotates at the speed of armature.
  trapezoidal space distribution and is stationary in space.
  triangular space distribution and rotates at the speed of armature.

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