Capacitor Questions and Answers
A capacitor is a key component in electronics and is frequently featured in aptitude questions and answers for exams like GATE, SSC JE, and PSU technical tests. It stores electrical energy in an electric field and plays a vital role in filtering, timing, and energy storage circuits. Understanding capacitor behavior—like charging, discharging, and reactance—is crucial for solving numerical and conceptual questions. This article provides aptitude questions with explanations that simplify the theory and application of capacitors, helping engineering students and aspirants build a strong conceptual foundation for their placement or competitive exams.
Capacitor
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48 questions
11. In an ac circuit, an output capacitor and a resistor are connected in series with an ac signal. What filter action will be the result?
- bandpass
- low-pass
- high-pass
- band-stop
12. What is the total opposition to current in a series RC circuit called?
- impedance
- inductance
- reactance
- resistance
13. What is the total opposition to current in a series RC circuit called?
- impedance
- inductance
- reactance
- resistance
14. In a capacitive circuit, current flow is limited to
- charging periods
- discharging periods
- neither charging periods nor discharging periods
- both charging periods and discharging periods
15. A capacitor is constructed of two parallel:
- conductors
- semiconductors
- inductors
- dielectrics
16. Which of the following determines the capacitance of a capacitor?
- Plate area, dielectric strength, and plate separation
- Voltage rating, dielectric constant, and temperature coefficient
- Temperature coefficient, plate area, and plate separation
- Plate area, dielectric constant, and plate separation
17. Most older types of paper capacitors have been replaced by which type of construction?
- electrolytic
- plastic film
- oxide casing
- waxed paper
18. What is the impedance of a series RC circuit that consists of a 0.22 F capacitor and a 200-ohm resistor connected to a 3 kHz source?
- 214 ohms
- 313 ohms
- 414 ohms
- 880 ohms
19. What is the reactance value for a capacitor installed in a dc circuit?
- zero
- moderate
- infinite
- cannot tell
20. In a purely capacitive circuit,
- current leads voltage by 90°
- voltage leads current by 90°
- current lags voltage by 90°
- current and voltage have a phase relationship of 0°