Master Circuit Laws: Online Quizzes for Electrical Engineering Students

Question 1

In a series circuit, the current through each component is:

Accepted Answer

Equal

Answer

Unequal

Answer

Proportionally related to the respective resistance

Answer

Inversely proportionally related to the respective voltage

Question 2

According to Kirchhoff's current law, the algebraic sum of currents entering and leaving a junction is:

Accepted Answer

Zero

Answer

Equal to the applied voltage

Answer

Equal to the total resistance

Answer

Non-zero

Question 3

In a parallel circuit, the voltage across each branch is:

Accepted Answer

Equal

Answer

Unequal

Answer

Proportionally related to the branch current

Answer

Inversely proportionally related to the branch resistance

Question 4

When a capacitor is fully charged, the current flowing through it is:

Accepted Answer

Zero

Answer

Maximum

Answer

Proportionally related to the voltage

Answer

Inversely proportionally related to the capacitance

Question 5

Which of the following is NOT considered a passive circuit element?

Accepted Answer

Diode

Answer

Resistor

Answer

Capacitor

Answer

Inductor

Question 6

The unit for measuring electrical resistance is:

Accepted Answer

Ohm

Answer

Ampere

Answer

Volt

Answer

Farad

Question 7

According to Ohm's law, if the resistance of a conductor is doubled, what will happen to its current?

Accepted Answer

It will halve.

Answer

It will double.

Answer

It will remain unchanged.

Answer

It will increase fourfold.

Question 8

Kirchhoff's current law states that the:

Accepted Answer

Total current entering a node equals the total current leaving the node.

Answer

Total voltage around a closed loop equals the sum of voltage drops across each component.

Answer

Resistance of a series circuit equals the sum of individual resistor resistances.

Answer

Power dissipated in a resistor equals the square of current multiplied by resistance.

Question 9

In a parallel circuit with three resistors, which will have the lowest value?

Accepted Answer

Equivalent resistance

Answer

Total resistance

Answer

Current through each resistor

Answer

Voltage across each resistor

Question 10

Capacitors store energy in the form of:

Accepted Answer

Electric field

Answer

Magnetic field

Answer

Kinetic energy

Answer

Potential energy

Question 11

An example of an AC circuit type is a:

Accepted Answer

Resonant circuit

Answer

Series circuit

Answer

Parallel circuit

Answer

Wheatstone bridge

Question 12

According to Kirchhoff's current law, in a circuit:

Accepted Answer

The sum of currents entering a junction equals the sum of currents leaving the junction

Answer

The total voltage equals the sum of voltage drops around a closed loop

Answer

The resistance of the circuit is inversely proportional to the current

Answer

The power dissipated in a resistor is proportional to the square of the current

Question 13

Kirchhoff's voltage law states that:

Accepted Answer

The sum of voltages around a closed loop in a circuit is zero

Answer

The current through a resistor is directly proportional to the voltage across it

Answer

The equivalent resistance of resistors in series is equal to the sum of their individual resistances

Answer

The power factor of a circuit is a measure of the phase difference between voltage and current

Question 14

A circuit with only one current path is known as a:

Accepted Answer

Series circuit

Answer

Parallel circuit

Answer

Mixed circuit

Answer

Resonant circuit

Question 15

In a parallel circuit, the total current is:

Accepted Answer

Equal to the sum of the branch currents

Answer

Less than the sum of the branch currents

Answer

Greater than the sum of the branch currents

Answer

Independent of the number of branches

Question 16

The equivalent resistance of two resistors connected in parallel is:

Accepted Answer

Less than either resistance value

Answer

Greater than either resistance value

Answer

Equal to the sum of the two resistance values

Answer

Equal to the product of the two resistance values

Question 17

The time constant of an RC circuit represents:

Accepted Answer

The time required for the capacitor to charge to 63% of its maximum value

Answer

The time required for the current to reach its maximum value

Answer

The time required for the voltage across the capacitor to reach its maximum value

Answer

The time required for the circuit to reach steady state

Question 18

The resonant frequency of an LC circuit is the frequency at which:

Accepted Answer

The inductive reactance and capacitive reactance cancel each other out

Answer

The current is maximum

Answer

The voltage across the inductor is maximum

Answer

The voltage across the capacitor is maximum

Question 19

The power factor of a circuit is a measure of:

Accepted Answer

The ratio of real power to apparent power

Answer

The ratio of reactive power to apparent power

Answer

The ratio of apparent power to real power

Answer

The ratio of reactive power to real power

Question 20

In a series circuit, the total current is:

Accepted Answer

Equal to the current through any individual resistor

Answer

Less than the current through any individual resistor

Answer

Dependent on the voltage across each resistor

Answer

Greater than the current through any individual resistor

Question 21

Consider a circuit with a 10Ω resistor and a 20Ω resistor connected in parallel. If the total current through the circuit is 5A, what is the current through the 10Ω resistor?

Accepted Answer

2.5A

Answer

5A

Answer

20A

Answer

10A

Question 22

In a balanced three-phase system, the phase shift between any two adjacent phases is:

Accepted Answer

120 degrees

Answer

90 degrees

Answer

180 degrees

Answer

60 degrees

Question 23

The power factor of a circuit is defined as:

Accepted Answer

The cosine of the phase angle between voltage and current

Answer

The ratio of real power to reactive power

Answer

The ratio of apparent power to reactive power

Answer

The ratio of reactive power to real power

Question 24

What is the primary purpose of a transformer?

Accepted Answer

To transfer electrical energy from one circuit to another while isolating them

Answer

To decrease the current of an AC signal

Answer

To increase the voltage of an AC signal

Question 25

Which of the following statements about AC circuits is** true**?

Accepted Answer

The current and voltage waveforms are sinusoidal and can be out of phase

Answer

The resistance is the only factor that affects the current

Answer

The current and voltage waveforms are always in phase

Answer

The power factor is always unity