Capacitors problems
- 1. A 2 µF, a 4 µF, and a 10 µF capacitor are connected in series. The total capacitance is less than
Options- A. 2 µF
- B. 4 µF
- C. 10 µF
- D. 1.5 µF Discuss
Correct Answer: 1.5 µF
- 2. When the plate area of a capacitor increases,
Options- A. the capacitance increases
- B. the capacitance decreases
- C. the capacitance is unaffected
- D. the voltage it can withstand increases. Discuss
Correct Answer: the capacitance increases
- 3. Two series capacitors (one 2 µF, the other of unknown value) are charged from a 24 V source. The 2 µF capacitor is charged to 16 V and the other to 8 V. The value of the unknown capacitor is
Options- A. 1 µF
- B. 2 µF
- C. 4 µF
- D. 8 µF Discuss
Correct Answer: 4 µF
- 4. An uncharged capacitor and a 1 kΩ resistor are connected in series with a switch and a 6 V battery. At the instant the switch is closed, the voltage across the capacitor is
Options- A. 6 V
- B. 3 V
- C. 2 V
- D. 0 V Discuss
Correct Answer: 0 V
- 5. Two 0.68 µF capacitors are connected in series across a 10 kHz sine wave signal source. The total capacitive reactance is
Options- A. 46.8 Ω
- B. 4.68 Ω
- C. 23.41 Ω
- D. 11.70 Ω Discuss
Correct Answer: 46.8 Ω
- 6. A sine wave voltage is applied across a capacitor. When the frequency of the voltage is decreased, the current
Options- A. increases
- B. remains constant
- C. decreases
- D. ceases Discuss
Correct Answer: decreases
- 7. What is the capacitance when Q = 60 µC and V = 12 V?
Options- A. 720 µF
- B. 5 µF
- C. 50 µF
- D. 12 µF Discuss
Correct Answer: 5 µF
- 8. A 0.01 µF capacitor equals how many picofarads?
Options- A. 100 pF
- B. 1,000 pF
- C. 10,000 pF
- D. 100,000 pF Discuss
Correct Answer: 10,000 pF
- 9. Four 0.15 µF capacitors are in parallel. The total capacitance is
Options- A. 0.15 µF
- B. 0.30 µF
- C. 0.6 µF
- D. 0.8 µF Discuss
Correct Answer: 0.6 µF
- 10. A 220 Ω resistor is in series with a 2.2 µF capacitor. The time constant is
Options- A. 48 µs
- B. 480 µs
- C. 2.42 µs
- D. 24 µs Discuss
Correct Answer: 480 µs
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