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qid 11773 · engineering

Question: A six-pole generator requires 4.5 amp shunt-field excitation to give rated voltage at no load, and 7.0 amp to give the same voltage at rated load of 200 amp. There are 750 shunt-field turns per pole. (a) How many series turns must be added to give flat-compound operation, using the short-shunt connection? (b) If 12 turns per pole are added, having a resistance of 0.005 ohm per pole, what should be the resistance of a shunt across the series- field terminals to give the desired flat-compound effect?

  1. 8.4, 0.095 ohm
  2. 8.4, 0.107 ohm
  3. 11.0, 0.110 ohm
  4. 9.4, 0.117 ohm
  5. 10.4, 0.107 ohm
  6. 9.0, 0.115 ohm
  7. 8.5, 0.100 ohm
  8. 9.4, 0.107 ohm
  9. 7.5, 0.120 ohm
  10. 10.4, 0.125 ohm

Our answer: H. 9.4, 0.107 ohm Source pending

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