Capacitors(Electrical Engineering ) Questions and answers for exam Preparation

Question 1. A 330 pF capacitor and a 220 pF capacitor are each connected across a 6 V dc source. The voltage across the 330 pF capacitor is

3 V
6 V
4 V
0 V

Explanation:-

Answer: Option B. -> 6 V

Question 2. Voltage leads current by 90° in a capacitor.

True
False

Explanation:-

Answer: Option B. -> False

Question 3. What is the capacitance when Q = 60 µC and V = 12 V?

720 µF
5 µF
50 µF
12 µF

Explanation:-

Answer: Option B. -> 5 µF

Question 4. Five time constants are required for a capacitor to charge fully or discharge fully.

True
False

Explanation:-

Answer: Option A. -> True

Question 5. A capacitor of 2,000 pF is greater than

0.02 µF
0.002 µF
0.0002 µF
0.0000002 F

Explanation:-

Answer: Option C. -> 0.0002 µF

Question 6. A sine wave voltage is applied across a capacitor. When the frequency of the voltage is decreased, the current

Increases
Remains constant
Decreases
Ceases

Explanation:-

Answer: Option C. -> Decreases

Question 7. Which of the following capacitors is polarized?

Mica
Ceramic
Plastic-film
Electrolytic

Explanation:-

Answer: Option D. -> Electrolytic

Question 8. A 2 µF, a 4 µF, and a 10 µF capacitor are connected in series. The total capacitance is less than

2 µF
4 µF
10 µF
1.5 µF

Explanation:-

Answer: Option D. -> 1.5 µF

Question 9. 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?

8 V
80 V
800 V
0.88 V

Explanation:-

Answer: Option A. -> 8 V

Question 10. When the plate area of a capacitor increases,

The capacitance increases
The capacitance decreases
The capacitance is unaffected
The voltage it can withstand increases

Explanation:-

Answer: Option A. -> The capacitance increases