Circuit Analysis: Master the Fundamentals of Electrical Circuits

Question 1

Ohm's law describes the relationship between

Accepted Answer

Voltage and current in a resistor

Answer

Voltage and power

Answer

Current and resistance

Answer

Power and resistance

Question 2

Kirchhoff's current law (KCL) states that:

Accepted Answer

The sum of currents entering a junction is equal to the sum of currents leaving the junction

Answer

The current through any branch of a parallel circuit is the same

Answer

The voltage drop across any resistor is the same

Answer

The power dissipated in a resistor is equal to the voltage times the current

Question 3

In AC circuits, impedance (Z) is a complex quantity that represents:

Accepted Answer

Opposition to the flow of alternating current (AC)

Answer

The resistance of the circuit

Answer

The capacitance of the circuit

Answer

The inductance of the circuit

Question 4

Which of the following is NOT a fundamental electrical circuit law?

Accepted Answer

Coulomb's Law

Answer

Ohm's Law

Answer

Kirchhoff's Current Law (KCL)

Answer

Kirchhoff's Voltage Law (KVL)

Question 5

Which of the following is a valid application of Kirchhoff's Current Law (KCL)?

Accepted Answer

Finding the current at a single point in a circuit

Answer

Determining the voltage across a resistor

Answer

Calculating the power dissipated by a capacitor

Answer

Analysing the frequency response of an inductor

Question 6

The impedance of a pure inductor is:

Accepted Answer

Inductive

Answer

Resistive

Answer

Capacitive

Answer

Zero

Question 7

Which of the following is a benefit of using node analysis?

Accepted Answer

It simplifies circuit analysis by reducing the number of equations

Answer

It is only applicable to DC circuits

Answer

It provides a graphical representation of the circuit

Answer

It eliminates the need for KVL

Question 8

Which of the following is not a fundamental electrical quantity?

Accepted Answer

Temperature

Answer

Voltage

Answer

Current

Answer

Resistance

Question 9

In a series circuit, the total resistance is:

Accepted Answer

Equal to the sum of the resistances of all the resistors

Answer

Greater than the resistance of any individual resistor

Answer

Less than the resistance of any individual resistor

Question 10

In an AC circuit, the phase angle between voltage and current depends on the circuit:

Accepted Answer

Combination of resistance, inductance, and capacitance

Answer

Resistance only

Answer

Inductance only

Answer

Capacitance only

Question 11

Which of the following techniques is used to analyze circuits with multiple independent sources?

Accepted Answer

Superposition theorem

Answer

Thevenin's theorem

Answer

Norton's theorem

Answer

Maximum power transfer theorem

Question 12

A capacitor stores energy in the form of an:

Accepted Answer

Electric field

Answer

Magnetic field

Answer

Chemical energy

Answer

Thermal energy

Question 13

A transformer is used primarily to:

Accepted Answer

Change voltage levels

Answer

Change current levels

Answer

Change frequency

Answer

Change power

Question 14

The power factor of an AC circuit is defined as the ratio of:

Accepted Answer

Real power to apparent power

Answer

Apparent power to reactive power

Answer

Reactive power to real power

Answer

Real power to reactive power

Question 15

Which of the following is NOT one of Kirchhoff's laws?

Accepted Answer

Power law

Answer

Current law

Answer

Voltage law

Question 16

Phasor analysis is a mathematical technique used for analyzing AC circuits. Which of the following quantities CANNOT be represented as a phasor?

Accepted Answer

Resistance

Answer

Voltage

Answer

Current

Question 17

Complex power (S) in an AC circuit can be calculated using the apparent power (VA) and the power factor (PF). Which of the following equations gives the formula for complex power?

Accepted Answer

S = VA * PF

Answer

S = VA / PF

Answer

S = PF / VA

Question 18

Passive circuit elements are components that do not generate or amplify power. Which of the following is NOT a passive circuit element?

Accepted Answer

Amplifier

Answer

Resistor

Answer

Inductor

Question 19

The complex impedance of a capacitor is given by:

Accepted Answer

1/(jωC)

Answer

jωC

Answer

R + jωL

Answer

1/R + jωC

Question 20

Which of the following is a method used for analyzing DC circuits?

Accepted Answer

Node analysis

Answer

Laplace transform

Answer

State-space analysis

Answer

Fourier analysis

Question 21

The power factor of a circuit is defined as the ratio of:

Accepted Answer

Real power to apparent power

Answer

Reactive power to apparent power

Answer

Apparent power to real power

Answer

Real power to reactive power

Question 22

The resonance frequency of an LC circuit is given by:

Accepted Answer

1/(2π√LC)

Answer

LC

Answer

1/LC

Answer

2π√LC

Question 23

Which of the following is a method for analyzing sinusoidal steady-state AC circuits?

Accepted Answer

Phasor analysis

Answer

Frequency-domain analysis

Answer

Time-domain analysis

Answer

State-space analysis