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Capacitors problems

  • 1. When is a capacitor fully charged?

  • Options
  • A. when the voltage across its plates is of the voltage from ground to one of its plates
  • B. when the current through the capacitor is the same as when the capacitor is discharged
  • C. when the voltage across the plates is 0.707 of the input voltage
  • D. when the current through the capacitor is directly proportional to the area of the plates
    • Discuss
  • 2. The quantity that represents an ideal capacitor dissipating 0 W of power is

  • Options
  • A. instantaneous power
  • B. true power
  • C. reactive power
  • D. resistive power
    • Discuss
  • 3. What is this circuit?

    Electronics Capacitors: What is this circuit?

  • Options
  • A. bandpass filter
  • B. high-pass filter
  • C. low-pass filter
  • D. differentiator
    • Discuss
  • 4. If the dielectric constant of a capacitor is decreased, then its capacitance will:

  • Options
  • A. increase
  • B. decrease
  • C. remain the same
  • D. be destroyed
    • Discuss
  • 5. In an ac circuit, a capacitor and an output resistor are connected in series with an ac signal. What filter action will be the result?

  • Options
  • A. bandpass
  • B. low-pass
  • C. high-pass
  • D. band-stop
    • Discuss
  • 6. In an RC circuit, true power (PR) equals:

  • Options
  • A.
  • B. VS × I
  • C. I2R
  • D. VT × RT
    • Discuss
  • 7. If an open capacitor is checked with an ohmmeter, the needle will:

  • Options
  • A. stay on zero
  • B. stay on infinity
  • C. move from zero to infinity
  • D. move from infinity to zero
    • Discuss
  • 8. In a purely capacitive circuit,

  • Options
  • A. current leads voltage by 90°
  • B. voltage leads current by 90°
  • C. current lags voltage by 90°
  • D. current and voltage have a phase relationship of 0°
    • Discuss
  • 9. Power stored from the source and then returned to the source is called:

  • Options
  • A. apparent power
  • B. impedance power
  • C. reactive power
  • D. true power
    • Discuss
  • 10. What is the voltage across a capacitor after being charged from a 100 V source for a period of one time constant?

  • Options
  • A. 37.8 V
  • B. 38 V
  • C. 63 V
  • D. 101 V
    • Discuss

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