Capacitors problems
- 1. 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
Correct Answer: An uncharged capacitor appears as a short to an instantaneous change in current.
- 2. 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
Correct Answer: 7.4 V
- 3.
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
Correct Answer: 345 ms
- 4. 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
Correct Answer: plate separation
- 5. What is the value of a capacitor that can store two coulombs of charge when 500 volts is applied across its plates?
Options- A. 4 µF
- B. 250 µF
- C. 4,000 µF
- D. 250 F Discuss
Correct Answer: 4,000 µF
- 6. When a circuit consists of a capacitor and a resistor in series with a voltage source, and the voltage across the resistor is zero, then the capacitor is:
Options- A. charging
- B. discharging
- C. fully charged
- D. fully discharged Discuss
Correct Answer: fully charged
- 7. In a capacitive circuit, current flow is limited to
Options- A. charging periods
- B. discharging periods
- C. neither charging periods nor discharging periods
- D. both charging periods and discharging periods Discuss
Correct Answer: both charging periods and discharging periods
- 8. What is the total opposition to current in a series RC circuit called?
Options- A. impedance
- B. inductance
- C. reactance
- D. resistance Discuss
Correct Answer: impedance
- 9. When a 4.7 µF capacitor is connected to a 1 kHz source, what is its capacitive reactance?
Options- A. 4.7 ohms
- B. 29.5 ohms
- C. 34 ohms
- D. 213 ohms Discuss
Correct Answer: 34 ohms
- 10. Capacitive reactance values connected in series offer
Options- A. an increase in total XC
- B. a decrease in total XC
- C. no change in total XC
- D. total opposition to voltage in the circuit Discuss
Correct Answer: an increase in total XC
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