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Home ‣ Electronics ‣ Capacitors Comments
  • Question

  • What do variable capacitors use for dielectric?


  • Options
  • A. ceramic, electrolytic, mica, or paper
  • B. air, ceramic, mica, or plastic
  • C. ceramic, paper, plastic, or mica
  • D. mica, ceramic, plastic, or electrolytic

  • Correct Answer
  • air, ceramic, mica, or plastic 

    • Capacitors problems

    Search Results

    • 1. A resistor and an output capacitor form a series circuit with a square wave applied. The circuit is:

    • Options
    • A. an integrator
    • B. a differentiator
    • C. a multiplier
    • D. a divider
      • Discuss
    • 2. What is wrong with a leaky capacitor?

    • Options
    • A. It is open.
    • B. It is shorted.
    • C. The dielectric resistance has increased.
    • D. The dielectric resistance has decreased.
      • Discuss
    • 3. 

      How long would it take the capacitor in the given circuit to completely discharge if the switch was in position 2?


    • Options
    • A. 22 ms
    • B. 69 ms
    • C. 345 ms
    • D. 420 ms
      • Discuss
    • 4. If a charged capacitor is disconnected from a circuit, it will:

    • Options
    • A. immediately discharge
    • B. recharge
    • C. remain charged
    • D. leak the charge
      • Discuss
    • 5. What is the circuit's impedance?


    • Options
    • A. 1192 Ω
    • B. 843 Ω
    • C. 723 Ω
    • D. 511 Ω
      • Discuss
    • 6. What is the dc charging/discharging time constant for the circuit?


    • Options
    • A. 294 ps
    • B. 13.5 ms
    • C. 21.25 ms
    • D. 2.16 Gs
      • Discuss
    • 7. Which of the following statements is true?

    • Options
    • A. The voltage to which a capacitor is charged can change instantaneously.
    • B. The current in a capacitive circuit takes time to change.
    • C. A fully charged capacitor appears as a short to dc current.
    • D. An uncharged capacitor appears as a short to an instantaneous change in current.
      • Discuss
    • 8. If C1, a 4.7 µF capacitor, and C2, a 3.3 µF capacitor are in series with 18 Vdc applied, what is the voltage across C1?

    • Options
    • A. 3.3 V
    • B. 7.4 V
    • C. 6.6 V
    • D. 9.4 V
      • Discuss
    • 9. 

      How long would it take the capacitor in the given circuit to completely charge if the switch was in position 1?


    • Options
    • A. 22 ms
    • B. 69 ms
    • C. 345 ms
    • D. 440 ms
      • Discuss
    • 10. The strength of an electric field at a given point is proportional to the potential difference on the plates and inversely proportional to the:

    • Options
    • A. plate separation
    • B. negative plate only
    • C. field strength
    • D. charge difference
      • Discuss

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