Electrical Engineering MCQ Questions title: Capacitor MCQ Questions.
The capacitor is an electrical device that stores charge in an electric field. Capacitors are widely employed in electronic devices as well as in Power applications. Given below are basic MCQ Questions on Capacitor
The SI unit of capacitance is
The SI unit of capacitance is:
- tesla
- farad
- henry
- weber
Correct answer: 2. Farad
The area of capacitor plate is increased by two times, the capacitance is now
The area of capacitor plate is increased by two times, the capacitance is now:
- Halved
- Same as it was before
- Doubled
- 4 times of original capacitance
Correct answer: 3. Doubled
Solution: C = εA/d
where
C = capaciatance in Farads
ε = Permivity of dielectric
A = Area of plate
d = Distance between plates in meters
From above formula one can understand that by doubling area the capacitance also doubles.
A 500 pF Capacitor has air as its dielectric medium. The air is now replaced by the mica. The new capacitance is:
- 90.90 pF
- 1 uF
- 2.75 uF
- 5.25 uF
Correct answer: 3. 2.75 uF
A 2000 uF capacitor stores a charge of 0.5 C. The terminal voltage is
A 2000 uF capacitor stores a charge of 0.5 C. The terminal voltage is:
- 2.5 V
- 25 V
- 250 V
- 2500 V
Correct answer: 3. 250 V
Two capacitors of 5uF and 10 uF are connected in series. The overall capacitance is
Two capacitors of 5uF and 10 uF are connected in series. The overall capacitance is:
- 2.5 uF
- 3.33 uF
- 5.58 uF
- 15 uF
Correct answer: 2. 3.33 uF