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  • Question

  • What happens when moving expanding lines of force encounter a conductor?


  • Options
  • A. Current increases.
  • B. Voltage is induced.
  • C. Resistance is reduced.
  • D. Power is increased.

  • Correct Answer
  • Voltage is induced. 

    • Inductors problems

    Search Results

    • 1. If 360 Vac is the output of a 300-turn secondary winding, what is the input voltage when the primary winding has 150 turns?

    • Options
    • A. 2.4 Vac
    • B. 150 Vac
    • C. 180 Vac
    • D. 720 Vac
      • Discuss
    • 2. A magnetic field has:

    • Options
    • A. polar fields
    • B. lines of force
    • C. magnetomotive force
    • D. lines of reluctance
      • Discuss
    • 3. When a rate of one ampere per second causes an induced voltage of one volt, the unit of measure is

    • Options
    • A. a lenz
    • B. an ohm
    • C. a farad
    • D. a henry
      • Discuss
    • 4. What is the total inductance, assuming no mutual inductance?


    • Options
    • A. 12 mH
    • B. 6 mH
    • C. 0.73 mH
    • D. 0 mH
      • Discuss
    • 5. What is magnetic flux?

    • Options
    • A. the number of lines of force in webers
    • B. the number of lines of force in maxwells
    • C. the number of lines of force in teslas
    • D. the number of lines of force in flux density
      • Discuss
    • 6. Find IR and IL.


    • Options
    • A. IR = 50 mA, IL = 109 mA
    • B. IR = 150 mA, IL = 9 mA
    • C. IR = 50 mA, IL = 151 mA
    • D. IR = 150 mA, IL = 53 mA
      • Discuss
    • 7. Which two values are plotted on a B-H curve graph?

    • Options
    • A. reluctance and flux density
    • B. permeability and reluctance
    • C. magnetizing force and permeability
    • D. flux density and magnetizing force
      • Discuss
    • 8. A utility pole transformer used to supply a residential customer with two phases uses:

    • Options
    • A. two phases on the primary
    • B. a center tap on the secondary
    • C. a separate ground for each phase
    • D. a small coefficient of coupling
      • Discuss
    • 9. A winding of wire can be called

    • Options
    • A. an inductor
    • B. a coil
    • C. a choke
    • D. All of the above
      • Discuss
    • 10. Counter emf or induced voltage is:

    • Options
    • A. inversely proportional to the change in current
    • B. directly proportional to the change in time
    • C. directly proportional to the inductance in henrys
    • D. inversely proportional to the inductance in henrys
      • Discuss

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