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Home Electrical Engineering Alternating Current and Voltage Comments

  • Question
  • A 20 kHz pulse waveform consists of pulses that are 15 µs wide. The duty cycle


  • Options
  • A. is 1%
  • B. is 30%
  • C. is 100%
  • D. cannot be determined

  • Correct Answer
  • is 30% 


  • Alternating Current and Voltage problems


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    • 1. If the rms current through a 4.7 kΩ resistor is 4 mA, the peak voltage drop across the resistor is

    • Options
    • A. 4 V
    • B. 18.8 V
    • C. 26.6 V
    • D. 2.66 V
    • Discuss
    • 2. When a sine wave has a frequency of 100 Hz in 12 s it goes through

    • Options
    • A. 1/100 cycle
    • B. 12 cycles
    • C. 120 cycles
    • D. 1,200 cycles
    • Discuss
    • 3. A sawtooth wave has a period of 10 ms. Its frequency is

    • Options
    • A. 10 Hz
    • B. 50 Hz
    • C. 100 Hz
    • D. 1,000 Hz
    • Discuss
    • 4. A waveform has a baseline of 3 V, a duty cycle of 20%, and an amplitude of 8 V. The average voltage value is

    • Options
    • A. 4 V
    • B. 4.6 V
    • C. 1.6 V
    • D. 11 V
    • Discuss
    • 5. How many degrees are there in Π/3 rad?

    • Options
    • A. 6°
    • B. 60°
    • C. 180°
    • D. 27°
    • Discuss
    • 6. If the rms voltage drop across a 15 kΩ resistor is 16 V, the peak current through the resistor is

    • Options
    • A. 15 mA
    • B. 1.5 mA
    • C. 10 mA
    • D. 1 mA
    • Discuss
    • 7. A signal with a 400 µs period has a frequency of

    • Options
    • A. 250 Hz
    • B. 2,500 Hz
    • C. 25,000 Hz
    • D. 400 Hz
    • Discuss
    • 8. The average value of a 12 V peak sine wave over one complete cycle is

    • Options
    • A. 0 V
    • B. 1.27 V
    • C. 7.64 V
    • D. 6.37 V
    • Discuss
    • 9. If the peak of a sine wave is 13 V, the peak-to-peak value is

    • Options
    • A. 6.5 V
    • B. 13 V
    • C. 26 V
    • D. none of the above
    • Discuss
    • 10. Sine wave A has a positive-going zero crossing at 45°. Sine wave B has a positive-going zero crossing at 60°. Which of the following statements is true?

    • Options
    • A. Wave A leads wave B by 15°.
    • B. Wave A lags wave B by 15°.
    • C. Wave A leads wave B by 105°.
    • D. Wave A lags wave B by 105°.
    • Discuss


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