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__________ type of DC generator does not need equalisers for satisfactory parallel operation.
1. Over-compound
2. Series
3. Flat-compound
4. Under-compound

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Correct Answer - Option 4 : Under-compound

For satisfactory parallel operation of dc series generators and over the compound generator, it is necessary to connect the armatures of the two machines through a heavy copper bar, called the equalizing bar.

An equalizer bar has a low resistance conductor wire, which connects together the points in the armature winding which should be at the same potentials.

Under-compound DC generator does not need equalizers for satisfactory parallel operation.

The functions of the equalizer bus are:

  • To cause the circulating current to flow within the armature winding itself, without letting them pass through the brushes.
  • To avoid unequal distribution of current at the brushes thereby helping to get sparkles commutation.
  • To save the brushes from handling the circulating currents.
  • To reduce the magnetic flux unbalance that cause the potential difference in various parallel paths.

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