Starting of DC Motors
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Questions and Answers

What is the purpose of armature voltage control during the starting of a DC motor?

  • To reduce the back emf during starting
  • To limit the motor current to a safe value by applying voltage gradually (correct)
  • To increase the motor speed during starting
  • To prevent sparking at the commutator during starting
  • What happens if a DC motor is started with full supply voltage across its terminals?

  • The motor will not start at all
  • A very high current will flow, which may damage the motor (correct)
  • The motor will start smoothly without any issues
  • The motor will experience a decrease in speed
  • Which method is used to limit the armature current to a safe value during starting by adding a variable resistance in series with the armature circuit?

  • Variable resistance control (correct)
  • Field control
  • Armature reaction control
  • Back emf control
  • How does adding resistance in series with the armature circuit affect the loading speed of a DC motor?

    <p>$R_s$ does not affect the no-load speed, but it affects the loading speed (speed drop)</p> Signup and view all the answers

    What is the consequence of heavy sparking at the commutator during starting of a DC motor?

    <p>Damage to the commutator and winding</p> Signup and view all the answers

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