Self Excited DC Generator and DC Motor Module 3 Quiz
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Questions and Answers

What is the purpose of the field winding in a DC generator?

  • To produce the armature conductors
  • To provide a path of low reluctance for the flux
  • To produce the magnetic flux (correct)
  • To collect current from the armature windings

What is the purpose of the commutator in a DC generator?

  • To house the armature conductors
  • To magnetize the pole
  • To provide a path of low reluctance for the flux
  • To facilitate the collection of current from the armature windings (correct)

What is the difference between lap windings and wave windings in a DC machine?

  • Lap windings are suitable for low voltage, high current machines, while wave windings are suitable for high voltage, low current machines (correct)
  • Lap windings and wave windings are both suitable for low voltage, high current machines
  • Lap windings and wave windings are both suitable for high voltage, low current machines
  • Lap windings are suitable for high voltage, low current machines, while wave windings are suitable for high current, low voltage machines

What is the purpose of the armature core in a DC generator?

<p>To provide a path of very low reluctance to the flux through the armature (B)</p> Signup and view all the answers

What is the purpose of the brushes in a DC generator?

<p>To collect current from the armature windings (A)</p> Signup and view all the answers

What is the purpose of field excitation in a DC generator?

<p>To energize the field windings and set up a steady magnetic field (A)</p> Signup and view all the answers

What is the function of the stator in a DC generator?

<p>It is the stationary part of the machine (D)</p> Signup and view all the answers

Which material is commonly used to make the yoke of a DC generator?

<p>Steel (D)</p> Signup and view all the answers

What is the main function of the rotor in a DC generator?

<p>Converts electrical energy into mechanical energy (B)</p> Signup and view all the answers

What type of DC generator has field magnets energized by their own supplied current?

<p>Self-excited DC generator (C)</p> Signup and view all the answers

At what condition does a DC generator achieve maximum efficiency?

<p>When the constant losses are equal to the variable losses (B)</p> Signup and view all the answers

In a DC generator, what do the pole shoes do?

<p>Represent the direction of thrust on the conductor (B)</p> Signup and view all the answers

What is the voltage regulation of a DC generator?

<p>The percentage rise in the terminal voltage when the load is removed (A)</p> Signup and view all the answers

Which part of a DC generator helps link an electrical energy system to another energy system?

<p>Rotor (A)</p> Signup and view all the answers

What is the function of the pole in a DC generator?

<p>Provides a reversible means of energy flow in its magnetic field (A)</p> Signup and view all the answers

According to Faraday's law, what can induce an electromotive force in a conductor?

<p>A changing magnetic field (D)</p> Signup and view all the answers

What type of DC motor has a permanent magnet on the inner periphery of the stator?

<p>Permanent magnet DC motor (C)</p> Signup and view all the answers

Which law describes the force experienced by a charged particle in the presence of electric and magnetic fields?

<p>Lorentz law (C)</p> Signup and view all the answers

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