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Inductors problems

  • 1. A winding of wire can be called

  • Options
  • A. an inductor
  • B. a coil
  • C. a choke
  • D. All of the above
    • Discuss
  • 2. 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
  • 3. What is the phase angle between the source voltage and current, when a 100 mH inductor with a reactance of 6 kΩ, and a 1 kΩ resistor are in series with a source?

  • Options
  • A. 0.1 degrees
  • B. 9.0 degrees
  • C. 61.0 degrees
  • D. 81.0 degrees
    • Discuss
  • 4. In a purely inductive circuit,

  • Options
  • A. current leads voltage by 90°
  • B. voltage lags current by 90°
  • C. voltage leads current by 90°
  • D. voltage and current are in phase (0°)
    • Discuss
  • 5. How long until the current is at a maximum?

    Electronics Inductors: How long until the current is at a maximum?

  • Options
  • A. 0 µs
  • B. 5 µs
  • C. 15 µs
  • D. 25 µs
    • Discuss
  • 6. In a transformer, what will happen to the primary current if the secondary magnetic field increases?

  • Options
  • A. Ip will increase.
  • B. Ip will be canceled.
  • C. Ip will remain the same.
  • D. Ip will decrease.
    • Discuss
  • 7. Electronics Inductors: In the given ci

    In the given circuit, what will the voltage be across R3 25 µs after the switch is moved to position 2?


  • Options
  • A. 2.88 V
  • B. 5.9 V
  • C. 8.34 V
  • D. 14 V
    • Discuss
  • 8. What is the current rise after 2 time constants if Vs = 12 V dc, R = 60 Ω, and the inductor is rated at 24 mH?

  • Options
  • A. 79.9 mA
  • B. 126.4 mA
  • C. 173.0 mA
  • D. 198.6 mA
    • Discuss
  • 9. The electrical energy consumed by a coil is stored in the form of:

  • Options
  • A. an electrical field
  • B. a force field
  • C. an electrostatic field
  • D. a magnetic field
    • Discuss
  • 10. When the transformer secondary is not loaded:

  • Options
  • A. secondary voltage increases
  • B. no secondary current flows
  • C. no secondary voltage is present
  • D. secondary current increases
    • Discuss

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