Electrical Machines
Addition of 0.3 % to 4.5 % silicon to iron

  increases the hysteresis loss.
  reduces the saturation magnetization.
  increases the electrical resistivity of iron.
None of these

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Electrical Machines
The introduction of interpoles in between the main poles improves the performance of a dc machine, because

 the interpoles produce additional flux to augment the developed torque
 a counter-emf is induced in the coil undergoing commutation
 the inequality of air-gap flux on the top and bottom halves of the armature is removed
 the flux waveform is improved with reduction in harmonics

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