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  • Question
  • 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

  • Correct Answer
  • 248 ?H 


  • Inductors problems


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    • 1. 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
    • 2. 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
    • 3. 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
    • 4. 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
    • 5. A 5 mH, a 4.3 mH, and a 0.6 mH inductor are connected in parallel. The total inductance is

    • Options
    • A. 9.9 mH
    • B. greater than 5 mH
    • C. 9.9 mH or greater than 5 mH
    • D. less than 0.6 mH
    • 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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