Capacitors and Inductors: Energy Storage and Time Constants

Question 1

The unit of capacitance is:

Accepted Answer

Farad

Answer

Henry

Answer

Ohm

Answer

Volt

Question 2

The time constant of a circuit with a capacitor and a resistor is given by:

Accepted Answer

RC

Answer

L/R

Answer

I/C

Answer

V/C

Question 3

Increasing the frequency of an AC current through an inductor results in:

Accepted Answer

Increased inductive reactance

Answer

Decreased inductive reactance

Answer

Increased capacitive reactance

Answer

Decreased capacitive reactance

Question 4

Which of the following is NOT a common application of capacitors?

Accepted Answer

Amplification

Answer

Energy storage

Answer

Filtering

Answer

Timing circuits

Question 5

The energy (E) stored in a capacitor is given by the formula:

Accepted Answer

E = 1/2CV^2

Answer

E = CV

Answer

E = 1/2LI^2

Answer

E = LI

Question 6

What is NOT a primary function of a capacitor?

Accepted Answer

Enhancing voltage signals

Answer

Storing electrical energy

Answer

Passing AC signals while blocking DC signals

Answer

Smoothing voltage fluctuations

Question 7

The time constant (τ) of an RC circuit is given by:

Accepted Answer

τ = R * C

Answer

τ = C / R

Answer

τ = R / C

Answer

τ = C * R

Question 8

Which of the following is NOT a type of inductor?

Accepted Answer

Ceramic inductor

Answer

Air-core inductor

Answer

Iron-core inductor

Answer

Variable inductor

Question 9

The unit of inductance is the:

Accepted Answer

Henry (H)

Answer

Farad (F)

Answer

Ohm (Ω)

Answer

Volt (V)

Question 10

The time constant (τ) of an LR circuit is defined as:

Accepted Answer

τ = L / R

Answer

τ = R / L

Answer

τ = L * R

Answer

τ = R * L

Question 11

A common application where capacitors and inductors are used together is in:

Accepted Answer

Resonant circuits

Answer

Amplifier circuits

Answer

Filter circuits

Answer

Oscillator circuits

Question 12

Capacitors are utilized in power factor correction to:

Accepted Answer

Lower current consumption from the power source

Answer

Increase voltage supplied to the load

Answer

Filter out harmonic components from the power source

Answer

Regulate the frequency of the power source

Question 13

How do capacitors and inductors differ in how they store energy?

Accepted Answer

Capacitors store energy in an electric field, while inductors store energy in a magnetic field.

Answer

Both capacitors and inductors store energy in an electric field.

Answer

Both capacitors and inductors store energy in a magnetic field.

Answer

The rate of energy release is unique to each component, with capacitors releasing energy more quickly than inductors.

Question 14

In an AC circuit, which statement accurately describes the behavior of a capacitor?

Accepted Answer

Capacitors oppose the flow of alternating current due to their capacitive reactance

Answer

Capacitors allow alternating current to pass without hindrance

Answer

Capacitors store electrical energy as a magnetic field

Answer

Capacitors have no effect on alternating current

Question 15

The energy stored in a capacitor is given by:

Accepted Answer

1/2 * C * V^2

Answer

C * V^2

Answer

2 * L * I^2

Answer

1/2 * L * I^2

Question 16

When a capacitor is fully charged, the voltage across it:

Accepted Answer

Is equal to the supply voltage

Answer

Is zero

Answer

Is half the supply voltage

Answer

Varies depending on the capacitance

Question 17

The unit of capacitance is:

Accepted Answer

Farad

Answer

Henry

Answer

Coulomb

Answer

Ohm

Question 18

Which of the following is NOT a type of capacitor?

Accepted Answer

Inductor

Answer

Ceramic capacitor

Answer

Electrolytic capacitor

Answer

Film capacitor

Question 19

The current through an inductor:

Accepted Answer

Lags the voltage by 90 degrees

Answer

Leads the voltage by 90 degrees

Answer

Is in phase with the voltage

Answer

Is zero

Question 20

What is the SI unit of capacitance?

Accepted Answer

Farad (F)

Answer

Coulomb (C)

Answer

Henry (H)

Answer

Volt (V)

Question 21

What is the primary function of an inductor in an electrical circuit?

Accepted Answer

To store energy in a magnetic field

Answer

To block DC current

Answer

To generate voltage

Answer

To allow current to flow without resistance

Question 22

What happens to the overall resistance of a circuit when a capacitor is connected in parallel with a resistor?

Accepted Answer

Decreases

Answer

Increases

Answer

Remains the same

Answer

Becomes infinite

Question 23

What is the impact of connecting an inductor in series with a resistor?

Accepted Answer

Increases the overall impedance

Answer

Reverses the direction of the current

Answer

Has no effect on the overall impedance

Answer

Decreases the overall impedance