Electrical Machines
Number of tappings for each equalizer ring is equal to

  number of pole pairs.
  number of poles.
  number of commutator segments.
  number of parallel paths.

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Electrical Machines
Two 3-phase AC generators are such that one has twice the linear dimensions of the other. The field windings of each are excited to give identical sinusoidal air-gap flux density waveform. Both have the same number of stator slots and identical winding patterns. The conductor/slot in a big generator is K times that of the smaller one. The value of K to get equal no load voltage at same frequency is

 1/4.
 4.
  1/2.
 8.

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