DC Machine Construction
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Questions and Answers

What is the purpose of the yoke in a DC machine?

  • To protect the inner parts of the machine mechanically (correct)
  • To support the field or exciting coils
  • To provide a low reluctance path for the magnetic flux
  • To spread out the magnetic flux over the armature periphery

    • What material is generally used for making the yoke of smaller DC machines?

  • Cast iron (correct)
  • Wrought iron
  • Enameled copper wire
  • Cast steel

    • What is the function of pole shoes in a DC machine?

  • To provide mechanical protection to the inner parts
  • To provide a low reluctance path for the magnetic flux
  • To support the field or exciting coils
  • To spread out the magnetic flux over the armature periphery (correct)

    • What material is commonly used for making pole core and pole shoes in a DC machine?

    <p>Cast steel</p> Signup and view all the answers

    What type of wire is used for the construction of field or exciting coils in a DC machine?

    <p>Enameled copper wire</p> Signup and view all the answers

    Yoke provides a low reluctance path for the ______ flux

    <p>magnetic</p> Signup and view all the answers

    Pole core and pole shoes are made of thin cast steel or wrought iron ______

    <p>laminations</p> Signup and view all the answers

    Enameled copper wire is used for the construction of field or exciting ______

    <p>coils</p> Signup and view all the answers

    Armature Core is cylindrical is shape and keyed to the rotating ______

    <p>shaft</p> Signup and view all the answers

    The outer cylindrical frame to which main poles and inter poles are fixed is called ______

    <p>yoke</p> Signup and view all the answers

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