Faraday's Law of Electromagnetic Induction and DC Generators
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Questions and Answers

What is the primary function of a commutator in a DC generator?

  • To filter out unwanted electromagnetic interference
  • To regulate the speed of the armature rotation
  • To increase the voltage output of the generator
  • To convert the generated alternating current (AC) into direct current (DC) (correct)

How does the direction of the generated emf change in a DC generator?

  • It remains constant throughout the rotation of the armature
  • It changes across every conductor when the armature rotates (correct)
  • It depends on the strength of the magnetic field
  • It alternates between positive and negative values for each half-rotation

What is the fundamental principle behind the operation of a DC generator?

  • Electrostatic induction
  • Thermoelectric effect
  • Electromagnetic induction (correct)
  • Transformer action

What is the shape of the output voltage waveform of a DC generator?

<p>Pulsating DC (C)</p> Signup and view all the answers

What happens when a closed path is provided to the moving conductor in a DC generator?

<p>The generated emf causes a current to flow in the circuit (C)</p> Signup and view all the answers

How does the commutator in a DC generator reverse the connections to the external circuit?

<p>It reverses the connections at the same instant that the direction of emf reverses in each coil side (D)</p> Signup and view all the answers

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