If an electrical generator fails to build up the probable cause could not be

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If an electrical generator fails to build up the probable cause could not be

  1. Faulty shunt connections tending to reduce the residual magnetism
  2. Field resistance less than the critical resistance
  3. Imperfect brush contact
  4. No residual magnetism in the generator

Correct answer: 2. Field resistance less than the critical resistance

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