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  • Question

  • How is ac current related to ac voltage in a purely capacitive circuit?


  • Options
  • A. AC current is 0.707 of the ac voltage.
  • B. AC current lags ac voltage.
  • C. AC current is 0.637 of the ac voltage.
  • D. AC current leads ac voltage.

  • Correct Answer
  • AC current leads ac voltage. 

    • Capacitors problems

    Search Results

    • 1. What is the impedance of this circuit?


    • Options
    • A. 5928 Ω
    • B. 2000 Ω
    • C. 1902 Ω
    • D. 1798 Ω
      • Discuss
    • 2. Most older types of paper capacitors have been replaced by which type of construction?

    • Options
    • A. electrolytic
    • B. plastic film
    • C. oxide casing
    • D. waxed paper
      • Discuss
    • 3. Which material has the highest dielectric strength?

    • Options
    • A. Air
    • B. Paper
    • C. Mica
    • D. Oil
      • Discuss
    • 4. What is the total capacitance?


    • Options
    • A. 1 F
    • B. 12 F
    • C. 0.615 F
    • D. 8 F
      • Discuss
    • 5. What is the reactance value for a capacitor installed in a dc circuit?

    • Options
    • A. zero
    • B. moderate
    • C. infinite
    • D. cannot tell
      • Discuss
    • 6. For a given charge difference, electrostatic field strength varies according to:

    • Options
    • A. plate differential
    • B. plate area
    • C. plate distance
    • D. dielectric quantity
      • Discuss
    • 7. What is the angle theta value for a 5.6 µF capacitor and a 50-ohm resistor in series with a 1.1 kHz, 5 Vac source?

    • Options
    • A. 27.3 degrees
    • B. 62.7 degrees
    • C. ?27.3 degrees
    • D. ?62.7 degrees
      • Discuss
    • 8. After a capacitor has charged for 1 tc, what percentage of current remains in the resistor?

    • Options
    • A. 63.2
    • B. 36.8
    • C. 13.5
    • D. 5.0
      • Discuss
    • 9. What is the power factor if the apparent power of a circuit is 5 W, while the true power is 4 W?

    • Options
    • A. 0.0 W
    • B. 0.8 W
    • C. 1.0 W
    • D. 1.25 W
      • Discuss
    • 10. What is the reactive power?


    • Options
    • A. 6.8 mW
    • B. 9.8 mW
    • C. 12.8 mW
    • D. 15.8 mW
      • Discuss

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