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Inductors problems

  • 1. When the current through an inductor decreases, the amount of energy stored in the electromagnetic field

  • Options
  • A. increases
  • B. decreases
  • C. remains the same
  • D. doubles
    • Discuss
  • 2. An inductor, a 1 kΩ resistor, and a switch are connected in series across a 6 V battery. At the instant the switch is closed, the inductor voltage is

  • Options
  • A. 0 V
  • B. 6 V
  • C. 12 V
  • D. 4 V
    • Discuss
  • 3. An inductor and a resistor are in series with a sine wave voltage source. The frequency is set so that the inductive reactance is equal to the resistance. If the frequency is increased, then

  • Options
  • A. VR ? VL
  • B. VL < VR
  • C. VL = VR
  • D. VL > VR
    • Discuss
  • 4. A 240 µH inductor is equivalent to a

  • Options
  • A. 0.240 mH inductor
  • B. 0.000240 mH inductor
  • C. 240 mH inductor
  • D. 240 H inductor
    • Discuss
  • 5. Five inductors are connected in series. The lowest value is 8 ?H. If the value of each inductor is twice that of the preceding one, and if the inductors are connected in order of ascending values, the total inductance is

  • Options
  • A. 8 H
  • B. 32 ?H
  • C. 64 ?H
  • D. 248 ?H
    • Discuss
  • 6. The winding resistance of a coil can be increased by

  • Options
  • A. increasing the number of turns
  • B. using a thinner wire
  • C. changing the core material
  • D. increasing the number of turns or using thinner wire
    • Discuss
  • 7. When the current through an inductor is cut in half, the amount of energy stored in the electromagnetic field

  • Options
  • A. is quartered
  • B. quadruples
  • C. doubles
  • D. does not change
    • Discuss
  • 8. An inductance of 0.43 mH is smaller than

  • Options
  • A. 43 µH
  • B. 430 µH
  • C. 0.05 H
  • D. 0.00043 H
    • Discuss
  • 9. A 2 mH, a 3.3 mH, and a 0.2 mH inductor are connected in series. The total inductance is

  • Options
  • A. 55 mH
  • B. less than 0.2 mH
  • C. less than 5.5 mH
  • D. 5.5 mH
    • Discuss
  • 10. The voltage across a coil when di/dt = 20 mA/µs and L = 8 µH is

  • Options
  • A. 16 mV
  • B. 160 mV
  • C. 1.6 mV
  • D. 2.5 mV
    • Discuss

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