Quiz  /  Electrical Inductors Gate & PSU MCQ Questions With Answers

  • 1. 
    The symbol and units of inductors are

  • L (Henrys)
  • C (Conductance)
  • F (Flux)
  • C (Farads)

  • 2. 
    The effect on inductance by adding extra coil layers...

  • increase L
  • decrease L

  • 3. 
    Mutual inductance is NOT dependant on which of the following:

  • number of turns
  • physical size of each coil
  • Position of coils
  • thickness of wire

  • 4. 
    There are two 10H inductors in series. What is the total inductance?

  • 20
  • 10
  • 5

  • 5. 
    If a transformer secondary draws more current, the primary Back EMF will...

  • reduce
  • increase
  • no effect

  • 6. 
    In inductive circuits... (use CIVIL)

  • current lags voltage
  • current leads voltage

  • 7. 
    If two coils are positioned such that all of the flux from the primary passes onto the secondary, this is called

  • unity
  • saturation
  • losses

  • 8. 
    The current induced in a second piece of wire develops it's own magnetic field which in turn will induce a current in the original wire of reverse polarity. What is this called?

  • Opposite/opposing reactance
  • Counter/Back EMF
  • Mirror Effect
  • Magic

  • 9. 
    If supply frequency of a transformer increases, the secondary output voltage of the transformer

  • Increase
  • Decrease
  • Remain the same
  • Any of the above

  • 10. 
    Lamination of transformer core is made of

  • Cast Iron
  • Silicon Steel
  • Aluminium
  • Cast Steel

  • 11. 
    Inductors...

  • oppose change
  • like change

  • 12. 
    If you reverse the direction of movement of a magnet influencing a coil, what happens to the current?

  • reverses
  • increases
  • stays same
  • decreases

  • 13. 
    If in an iron cored coil the iron core is removed so as to make the air cored coil, the inductance of the coil will be

  • More
  • Less
  • The same
  • None of these

  • 14. 
    Electromagnetic induction can occur in any conductor, regardless of whether it's a straight piece of wire or coil.

  • True
  • False

  • 15. 
    Which of the following does not change in an ordinary transformer........

  • .Frequency
  • .Voltage
  • .Current
  • Any of the above

  • 16. 
    There are two 10H inductors in parallel. Total inductance is...

  • 5
  • 10
  • 20

  • 17. 
    Mutual inductance between two magnetically coupled coils depends on

  • Permeability of the core material
  • Number of turns of the coils
  • The cross-sectional area of their common core
  • All of the above

  • 18. 
    Inductors are NOT also known as...

  • chokes
  • reactors
  • coils
  • shunts

  • 19. 
    What is the greatest inductance core material out of the following?

  • Air
  • Copper
  • Iron
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