Wound Rotor Construction and Operation Quiz
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Questions and Answers

What is the purpose of the external resistances added to the rotor circuit at starting?

  • To decrease the motor speed
  • To increase the rotor circuit current
  • To reduce the rotor winding resistance
  • To obtain a high starting torque (correct)

    • How is the rotor winding of the wound rotor connected?

  • In star fashion (correct)
  • In series fashion
  • In delta fashion
  • In parallel fashion

    • What happens to the external resistances as the motor runs up to speed?

  • They are short-circuited
  • They are gradually removed from the circuit (correct)
  • They are disconnected from the slip rings
  • They are added to the stator winding

    • What is the role of the carbon brushes in the wound rotor?

    <p>To make contact with the slip rings</p> Signup and view all the answers

    How does the wound rotor operate once it attains normal speed?

    <p>The three carbon brushes are short-circuited</p> Signup and view all the answers

    What is the construction of the wound rotor?

    <p>The wound rotor consists of a laminated cylindrical core made of silicon steel.</p> Signup and view all the answers

    How is the rotor winding of the wound rotor connected?

    <p>The rotor winding of the wound rotor is uniformly distributed in the slots and connected in star fashion.</p> Signup and view all the answers

    What can be added to the rotor circuit at starting to obtain high starting torque?

    <p>External resistances can be added to the rotor circuit at starting to obtain high starting torque.</p> Signup and view all the answers

    What is the function of the carbon brushes in the wound rotor?

    <p>The carbon brushes rest on the slip rings and allow external resistances to be added to the rotor circuit at starting. They are later short-circuited once the motor attains normal speed.</p> Signup and view all the answers

    How does the use of external resistances affect the starting current and starting torque of the motor?

    <p>The use of external resistances considerably reduces the starting current and increases the starting torque of the motor.</p> Signup and view all the answers

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