DC Drives and Performance
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Questions and Answers

Which type of motor is extensively used in variable speed drives?

  • Synchronous motors
  • Induction motors
  • DC motors (correct)
  • AC motors

    • What does a DC motor drive do?

  • Converts low current to high current
  • Modulates power for the motor
  • Integrates between the controller and motor
  • All of the above (correct)

    • What is the formula for the armature current of a DC motor when the motor is at rest?

  • Ia = (E + Eb) / Ra
  • Ia = Eb / Ra
  • Ia = (E - Eb) / Ra (correct)
  • Ia = (E - Eb) * Ra

    • Which applications commonly use DC motor drives?

    <p>Rolling mills and paper mills</p> Signup and view all the answers

    What is the advantage of a DC motor in terms of torque compared to its rated continuous torque?

    <p>400% more</p> Signup and view all the answers

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