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Home ‣ Electronics ‣ Alternating Current and Voltage Comments
  • Question

  • Most practical alternators generate electricity from


  • Options
  • A. a coil rotating within a magnetic field
  • B. a magnetic field rotating around fixed windings
  • C. a permanent magnet rotating within a varying electromagnetic field
  • D. none of the above

  • Correct Answer
  • a magnetic field rotating around fixed windings 

    • Alternating Current and Voltage problems

    Search Results

    • 1. The effective value of a sine wave is equal to

    • Options
    • A. 0.707 of peak voltage
    • B. 0.636 of peak voltage
    • C. sin 45° of peak voltage
    • D. both 0.707 of peak voltage and sin 45° of peak voltage
      • Discuss
    • 2. A half-cycle average voltage of 12 V is equal to what rms voltage?

    • Options
    • A. 13.33 V
    • B. 8.48 V
    • C. 18.84 V
    • D. 7.64 V
      • Discuss
    • 3. 

      Calculate the duty cycle of the repetitive pulse waveform in the given circuit.


    • Options
    • A. 8.33%
    • B. 0%
    • C. 33.33%
    • D. 25%
      • Discuss
    • 4. What is the average voltage when a rectangular wave's base line voltage is 20 V, its peak-to-peak voltage is 50 V, and its duty cycle is 20%?

    • Options
    • A. 26 V
    • B. 30 V
    • C. 40 V
    • D. 45 V
      • Discuss
    • 5. 

      What is the peak-to-peak voltage of the waveform in the given circuit?


    • Options
    • A. 2 V
    • B. 4 V
    • C. 6 V
    • D. 8 V
      • Discuss
    • 6. 

      Calculate the positive-going slope of the waveform in the given circuit.


    • Options
    • A. 5 V/ms
    • B. 2.5 V/ms
    • C. 2.5 V/s
    • D. 5 V/s
      • Discuss
    • 7. In both induction and synchronous ac motors

    • Options
    • A. the operating speed is very steady
    • B. the stator magnetic field is stationary
    • C. the stator magnetic field rotates
    • D. the "squirrel cage" forms the rotor
      • Discuss
    • 8. What is the fourth harmonic of a fundamental frequency of 400 Hz?

    • Options
    • A. 100 Hz
    • B. 4 kHz
    • C. 4 Hz
    • D. 1.6 kHz
      • Discuss
    • 9. What is the instantaneous peak voltage at 250° on a 6 V peak sine wave?

    • Options
    • A. +5.64 V
    • B. ?5.64 V
    • C. +26.13 V
    • D. ?26.13 V
      • Discuss
    • 10. 

      Which point is the trailing edge of the repetitive pulse waveform in the given circuit?


    • Options
    • A. Point A
    • B. Point B
    • C. Point C
    • D. Point D
      • Discuss

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