Quiz  /  Emf MCQ

  • 1. 
    The flux used in the equation for the calculation of induced emf in a transformer is in its

  • RMS value
  • Average value
  • Maximum value
  • Twice that of the maximum value

  • 2. 
    What should be the value of primary to the secondary ratio for  a transformer to be an isolation transformer?

  • Equal to one
  • Less than one
  • More than one
  • Equal to 0.5

  • 3. 
    Who introduced the right-hand rule for determining the direction of the induced EMF?

  • 1.11f Φ
  • 0.5f Φ
  • 4f Φ
  • 8f Φ

  • 4. 
    Whenever there is a change in magnetic flux with respect to an electric conductor or a coil, an EMF is induced in the conductor is Faraday’s

  • Fleming
  • Lenz
  • Maxwell
  • Faraday

  • 5. 
    In which device is the principle of statically induced emf used?

  • first law
  • third law
  • second law
  • fourth law

  • 6. 
    Statically induced emf’s magnitude depends on the

  • 44.2 Watt
  • 30.8 Watt
  • 13.4 Watt
  • 20 Watt

  • 7. 
    Which is the property of a coil by which a counter emf is induced when the current through the coil changes?

  • Transformer
  • Motor
  • Generator
  • Battery

  • 8. 
    Principle of dynamically induced emf is used in a

  • Rate of change of flux
  • Coil resistance
  • Flux magnitude
  • None of these
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