Q. Four-point starter is used when

  • (A) motor field current is varied in narrow range
  • (B) motor speed is varied in small range
  • (C) motor field current is varied over wide range
  • (D) can be used anywhere
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✅ Correct Answer: (C) motor field current is varied over wide range
Explanation: three-point starter is employed where motor field current can be varied in a narrow range and so does the motor speed while four-point starter is used when motor field current can vary over a wide range and so does the motor speed.

Published by Mr. Dubey ⭐ 111.54K Points at 17-Sep-2023 11:28 am in Electrical Drives and Controls (EDC)

Explanation by: Mr. Dubey
three-point starter is employed where motor field current can be varied in a narrow range and so does the motor speed while four-point starter is used when motor field current can vary over a wide range and so does the motor speed.

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