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Capacitors problems

  • 1. A 0.00022 F capacitor equals how many microfarads?

  • Options
  • A. 22 µF
  • B. 220 µF
  • C. 2,200 µF
  • D. 22,200 µF
    • Discuss
  • 2. Of the following capacitors, which one has the highest dielectric constant?

  • Options
  • A. air
  • B. mica
  • C. glass
  • D. paper
    • Discuss
  • 3. A 4.7 MΩ resistor is in series with a 0.015 µF capacitor. The combination is across a 12 V source. How long does it take the capacitor to fully charge?

  • Options
  • A. 35 ms
  • B. 352 ms
  • C. 3.5 s
  • D. 70.5 ms
    • Discuss
  • 4. A 12 kHz voltage is applied to a 0.33 µF capacitor, and 200 mA of rms current is measured. What is the value of the voltage?

  • Options
  • A. 8 V
  • B. 80 V
  • C. 80 mV
  • D. 800 mV
    • Discuss
  • 5. A 10 µF, 20 µF, 22 µF, and 100 µF capacitor are in parallel. The total capacitance is

  • Options
  • A. 2.43 µF
  • B. 4.86 µF
  • C. 100 µF
  • D. 152 µF
    • Discuss
  • 6. Which of the following capacitors is polarized?

  • Options
  • A. mica
  • B. ceramic
  • C. plastic-film
  • D. electrolytic
    • Discuss
  • 7. When the voltage across a capacitor is tripled, the stored charge

  • Options
  • A. triples
  • B. is cut to one-third
  • C. stays the same
  • D. doubles
    • Discuss
  • 8. A capacitor and a resistor are connected in series to a sine wave generator. The frequency is set so that the capacitive reactance is equal to the resistance and, thus, an equal amount of voltage appears across each component. If the frequency is increased

  • Options
  • A. VR > VC
  • B. VC > VR
  • C. VR = VC
  • D. VR and VC = 0
    • Discuss
  • 9. In Question 6, the capacitor will reach full charge in a time equal to approximately

  • Options
  • A. 6 RC
  • B. 5 RC
  • C. RC
  • D. none of the above
    • Discuss
  • 10. A 0.47 µF capacitor is across a 2 kHz sine wave signal source. The capacitive reactance is

  • Options
  • A. 170 Ω
  • B. 17 Ω
  • C. 0.000169 Ω
  • D. 1.7 Ω
    • Discuss

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