Capacitor Questions with 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.

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After which time constant can a capacitor be considered to be fully charged?

A first
B third
C fifth
D seventh

Answer: Option C

You could increase the time constant of an RC circuit by

A adding a resistor in parallel with the circuit resistance
B adding a capacitor in parallel with the circuit capacitance
C increasing the amplitude of the input voltage
D exchanging the position of the resistor and capacitor in the circuit

Answer: Option B

A capacitor's rate of charge is considered:

A magnetic
B a current block
C linear
D exponential

Answer: Option D

A resistor and an output capacitor form a series circuit with a square wave applied. The circuit is:

A an integrator
B a differentiator
C a multiplier
D a divider

Answer: Option A

If an open capacitor is checked with an ohmmeter, the needle will:

A stay on zero
B stay on infinity
C move from zero to infinity
D move from infinity to zero

Answer: Option B

As a capacitor is being charged, current flowing into the capacitor will:

A increase
B decrease
C remain the same
D cannot tell

Answer: Option B

A capacitor stores energy within a dielectric between the conducting plates in the form of:

A a magnetic field
B positive voltage
C negative voltage
D an electric field

Answer: Option D

As a capacitor is being charged, the voltage across its terminals will:

A increase
B decrease
C remain the same
D oppose the source

Answer: Option A

After a capacitor has charged for 1 tc, what percentage of current remains in the resistor?

A 63.2
B 36.8
C 13.5
D 5.0

Answer: Option B

Q10

If a current of 40 mA flows through a series circuit consisting of a 0.4 F capacitor and a resistor in series with a 4 kHz, 40 Vac source, what is the total circuit impedance?

A 10 omega.gif
B 100 omega.gif
C 1 k omega.gif
D 1 M omega.gif

Answer: Option C

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Capacitor Questions and Answers

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Capacitor Questions and Answers

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Electronics

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