Electric Motors Quiz: Commutator, Stator, Back EMF, Rotor Bars
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Questions and Answers

What is the purpose of the commutator in a DC electric motor?

  • To increase the speed of the motor
  • To reverse the direction of the current in the armature coil (correct)
  • To control the torque of the motor
  • To convert AC to DC

    • What is the role of the stator in an electric motor?

  • To regulate the speed of the rotor
  • To conduct electrical current to the rotor
  • To provide a magnetic field for the rotor to interact with (correct)
  • To support and protect the rotor

    • What happens to the back emf (electromotive force) as the speed of a DC motor increases?

  • It decreases
  • It becomes zero
  • It remains constant
  • It increases (correct)

    • In an AC induction motor, what is the function of the rotor bars?

    <p>To provide a path for eddy currents to circulate</p> Signup and view all the answers

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