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  • Question
  • A sine wave voltage is applied across an inductor. When the frequency of the voltage is decreased, the current


  • Options
  • A. is increased
  • B. is decreased
  • C. does not change
  • D. momentarily goes to zero

  • Correct Answer
  • is increased 


  • Inductors problems


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    • 1. A sine wave with a period of 4 ms is changing at a faster rate than a sine wave with a period of

    • Options
    • A. 0.0045 s
    • B. 2 ms
    • C. 1.5 ms
    • D. 3,000 µs
    • Discuss
    • 2. A sine wave of 15 kHz is changing at a faster rate than a sine wave with a frequency of

    • Options
    • A. 25 kHz
    • B. 12 kHz
    • C. 18 kHz
    • D. 1.3 MHz
    • Discuss
    • 3. The conductive loop on the rotor of a simple two-pole, single-phase generator rotates at a rate of 400 rps. The frequency of the induced output voltage is

    • Options
    • A. 40 Hz
    • B. 100 Hz
    • C. 400 Hz
    • D. indeterminable
    • Discuss
    • 4. A square wave has a period of 60 µs. The first odd harmonic is

    • Options
    • A. 5 kHz
    • B. 50 kHz
    • C. 500 kHz
    • D. 33.33 kHz
    • Discuss
    • 5. One sine wave has a positive-going zero crossing at 15° and another sine wave has a positive-going zero crossing at 55°. The phase angle between the two waveforms is

    • Options
    • A. 0°
    • B. 45°
    • C. 40°
    • D. none of the above
    • Discuss
    • 6. A 320 µH coil is in series with a 3.3 kΩ resistor. How long does it take for current to build up to its full value?

    • Options
    • A. 0.48 s
    • B. 0.48 ms
    • C. 0.48 µs
    • D. 48 s
    • Discuss
    • 7. Two 10 H inductors are in parallel and the parallel combination is in series with a third 10 H inductor. What is the approximate total reactance when a voltage with a frequency of 7 kHz is applied across the circuit terminals?

    • Options
    • A. 219 kΩ
    • B. 66 kΩ
    • C. 660 kΩ
    • D. 1.3 MΩ
    • Discuss
    • 8. The inductance of an iron-core coil decreases if

    • Options
    • A. the number of turns is decreased
    • B. the iron core is removed
    • C. the length of the coil decreases
    • D. none of the above
    • Discuss
    • 9. Two inductors, L1 and L2, are in parallel. L1 has a value of 25 µH and L2 a value of 50 µH. The parallel combination is in series with L3, a 20 µH coil. The entire combination is across an ac source of 60 Vrms at 300 kHz. The total rms current is

    • Options
    • A. 87 mA
    • B. 870 mA
    • C. 87 A
    • D. 337 mA
    • Discuss
    • 10. Three 15 mH inductors are in series. The total inductance is

    • Options
    • A. 15 mH
    • B. 30 mH
    • C. 45 mH
    • D. 5 mH
    • Discuss


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