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Home Electrical Engineering Alternating Current and Voltage Comments

  • Question
  • The average half-cycle value of a sine wave with a 40 V peak is


  • Options
  • A. 25.48 V
  • B. 6.37 V
  • C. 14.14 V
  • D. 50.96 V

  • Correct Answer
  • 25.48 V 


  • Alternating Current and Voltage problems


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    • 1. A sinusoidal current has an rms value of 14 mA. The peak-to-peak value is

    • Options
    • A. 45.12 mA
    • B. 16 mA
    • C. 39.6 mA
    • D. 22.6 mA
    • Discuss
    • 2. A pulse waveform has a high time of 8 ms and a pulse width of 32 ms. The duty cycle is

    • Options
    • A. 25%
    • B. 50%
    • C. 1%
    • D. 100%
    • Discuss
    • 3. A phasor represents

    • Options
    • A. the magnitude and a quantity direction
    • B. the width of a quantity
    • C. the phase angle
    • D. the magnitude of a quantity
    • Discuss
    • 4. 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
    • 5. 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
    • 6. To produce an 800 Hz sine wave, a four-pole generator must be operated at

    • Options
    • A. 200 rps
    • B. 400 rps
    • C. 800 rps
    • D. 1,600 rps
    • Discuss
    • 7. If a sine wave goes through 10 cycles in 20 µs, the period is

    • Options
    • A. 20 µs
    • B. 4 µs
    • C. 2 µs
    • D. 100 µs
    • Discuss
    • 8. A sine wave with an rms value of 12 V is riding on a dc level of 18 V. The maximum value of the resulting waveform is

    • Options
    • A. 6 V
    • B. 30 V
    • C. 35 V
    • D. 0 V
    • Discuss
    • 9. 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
    • 10. 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


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