Electrical Engineering Quizzes: Test Your Knowledge

Question 1

Which of the following materials is NOT a semiconductor?

Accepted Answer

Copper

Answer

Silicon

Answer

Germanium

Answer

Gallium arsenide

Question 2

A step-down transformer has a turns ratio of 2:1. The primary voltage is 240 volts. What is the secondary voltage?

Accepted Answer

120 volts

Answer

360 volts

Answer

60 volts

Answer

480 volts

Question 3

Which of the following is a type of AC motor?

Accepted Answer

Induction motor

Answer

Pneumatic motor

Answer

Hydraulic motor

Answer

Combustion engine

Question 4

What is the function of a capacitor in an AC circuit?

Accepted Answer

Stores energy and provides a path for current to flow

Answer

Blocks DC current

Answer

Reduces voltage

Question 5

Which of the following is a renewable energy source?

Accepted Answer

Solar energy

Answer

Natural gas

Answer

Coal

Question 6

What is the unit of electrical power?

Accepted Answer

Watts

Answer

Volts

Answer

Amperes

Answer

Ohms

Question 7

Which of the following is a type of electrical wiring system?

Accepted Answer

Conduit

Answer

Plumbing

Answer

Sprinkler system

Answer

HVAC

Question 8

What is the primary purpose of a surge protector?

Accepted Answer

Protects electrical equipment from voltage spikes

Answer

Converts AC to DC

Answer

Amplifies current

Answer

Regulates voltage

Question 9

Which tool is used to measure electrical current?

Accepted Answer

Ammeter

Answer

Multimeter

Answer

Voltmeter

Answer

Oscilloscope

Question 10

Which of these components is **NOT** typically used in long-distance power transmission?

Accepted Answer

Capacitors

Answer

Transmission lines

Answer

Substations

Answer

Transformers

Question 11

Which of the following is NOT a fundamental component of an electrical circuit?

Accepted Answer

Transformer

Answer

Inductor

Answer

Capacitor

Answer

Resistor

Question 12

A diode is a semiconductor device that:

Accepted Answer

Allows current to flow in only one direction

Answer

Stores charge

Answer

Amplifies signals

Answer

Regulates voltage

Question 13

Which of the following is NOT a renewable energy source?

Accepted Answer

Coal

Answer

Wind

Answer

Hydroelectric

Answer

Solar

Question 14

The purpose of a contactor in an electrical system is to:

Accepted Answer

Control the flow of high currents

Answer

Regulate voltage

Answer

Store energy

Answer

Protect against overloads

Question 15

Which of the following is NOT a safety precaution when working with electrical circuits?

Accepted Answer

Touching bare wires with wet hands

Answer

Wearing safety glasses

Answer

Testing circuits before touching

Answer

Using insulated tools

Question 16

Which of the following is NOT a basic component found in an electrical circuit?

Accepted Answer

Transistor

Answer

Inductor

Answer

Resistor

Answer

Capacitor

Question 17

The SI unit of electrical current is the:

Accepted Answer

Ampere

Answer

Volt

Answer

Coulomb

Answer

Ohm

Question 18

Which law describes the relationship between voltage (V), current (I), and resistance (R) in an electrical circuit?

Accepted Answer

Ohm's Law (V = IR)

Answer

Gauss's Law for Magnetism

Answer

Biot-Savart Law

Answer

Kirchhoff's Voltage Law

Question 19

Which semiconductor device acts as an amplifier and a switch?

Accepted Answer

Transistor

Answer

Capacitor

Answer

Resistor

Answer

Diode

Question 20

The primary function of an electrical transformer is to:

Accepted Answer

Transfer electrical energy from one circuit to another, while changing the voltage level

Answer

Amplify electrical signals

Answer

Store electrical energy

Answer

Convert AC to DC

Question 21

Which type of power plant generates electricity primarily through the combustion of fossil fuels?

Accepted Answer

Thermal power plant

Answer

Geothermal power plant

Answer

Hydroelectric power plant

Answer

Wind farm

Question 22

Which of the following accurately describes the purpose of a capacitor in an electrical circuit?

Accepted Answer

Stores electrical energy in an electric field

Answer

Amplifies voltage

Answer

Converts AC to DC

Answer

Limits the flow of current

Question 23

Inductors are characterized by their ability to:

Accepted Answer

Resist changes in electrical current

Answer

Amplify electrical signals

Answer

Conduct electricity without resistance

Answer

Store electrical charge

Question 24

The fundamental difference between AC and DC electrical currents is that:

Accepted Answer

AC reverses direction periodically, while DC flows in only one direction

Answer

AC is more dangerous than DC

Answer

DC has higher voltage than AC

Answer

AC is stronger than DC

Question 25

Which safety protocol is essential for preventing electrical shocks?

Accepted Answer

Grounding electrical systems

Answer

Using electrical equipment with frayed wires

Answer

Touching live wires to test their voltage

Answer

Ignoring electrical codes

Question 26

Which SI unit represents the measure of electric current?

Accepted Answer

Ampere

Answer

Volt

Answer

Ohm

Answer

Joule

Question 27

Select the equation that represents Ohm's Law:

Accepted Answer

Voltage (V) = Current (I) × Resistance (R)

Answer

Resistance (R) = Voltage (V) / Current (I)

Answer

Resistance (R) = Current (I) / Voltage(V)

Answer

Current (I) = Voltage (V) × Resistance (R)

Question 28

Identify the defining characteristic of an ideal voltage source:

Accepted Answer

Maintains a constant voltage across its terminals regardless of load

Answer

Supplies an infinite amount of current

Answer

Has zero internal resistance

Question 29

Which type of transformer is used to connect circuits with different voltage levels?

Accepted Answer

Step-up or step-down transformer

Answer

Isolation transformer

Answer

Three-phase transformer

Answer

Autotransformer

Question 30

What is the primary purpose of a fuse in an electrical circuit?

Accepted Answer

To break the circuit when current exceeds a safe level, protecting components

Answer

To provide an alternative path for excess current flow

Answer

To regulate voltage in the circuit

Question 31

Which device is classified as a semiconductor?

Accepted Answer

Diode

Answer

Resistor

Answer

Capacitor

Answer

Inductor

Question 32

In an ideal series circuit, the current through each component is:

Accepted Answer

The same

Answer

Different

Answer

Zero

Answer

Infinite

Question 33

Which of the following is NOT a fundamental electrical quantity?

Accepted Answer

Power factor

Answer

Current

Answer

Voltage

Answer

Resistance

Question 34

The opposition to the flow of alternating current in a circuit is known as:

Accepted Answer

Impedance

Answer

Inductance

Answer

Resistance

Answer

Capacitance

Question 35

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

Accepted Answer

The same

Answer

Infinite

Answer

Different

Answer

Zero

Question 36

Which of the following is a semiconductor material commonly used in electronics?

Accepted Answer

Silicon

Answer

Copper

Answer

Aluminum

Answer

Iron

Question 37

The process of converting AC voltage to DC voltage is termed as:

Accepted Answer

Rectification

Answer

Filtering

Answer

Oscillation

Answer

Amplification

Question 38

The maximum power transfer theorem states that maximum power is transferred from a source to a load when:

Accepted Answer

Load resistance is equal to source resistance

Answer

Source resistance is zero

Answer

Load resistance is less than source resistance

Answer

Load resistance is greater than source resistance

Question 39

Which of the following is a renewable energy source?

Accepted Answer

Solar

Answer

Natural gas

Answer

Coal

Answer

Nuclear

Question 40

The SI unit of electric current is the:

Accepted Answer

Ampere

Answer

Ohm

Answer

Volt

Answer

Coulomb

Question 41

A step-up transformer with a turns ratio of 2:1 has a primary winding voltage of 120 volts. What is the secondary winding voltage?

Accepted Answer

240 volts

Answer

180 volts

Answer

360 volts

Answer

60 volts

Question 42

What is the primary purpose of a capacitor in a circuit?

Accepted Answer

To store electrical energy

Answer

To conduct electricity

Answer

To resist electricity

Question 43

Which safety measure is crucial when working with electricity?

Accepted Answer

Wear insulated gloves

Answer

Use a metal screwdriver

Answer

Ignore warning signs

Answer

Work in a wet environment

Question 44

Which unit is used to measure power in an electrical circuit?

Accepted Answer

Watt

Answer

Volt

Answer

Ampere

Answer

Ohm

Question 45

In an AC circuit, what is the relationship between voltage (V) and current (I) for a purely resistive load?

Accepted Answer

Voltage (V) is directly proportional to current (I).

Answer

Voltage (V) is quadratic to current (I).

Answer

Voltage (V) is inversely proportional to current (I).

Question 46

Which of the following is NOT considered a passive electrical component?

Accepted Answer

Transistor

Answer

Resistor

Answer

Inductor

Answer

Capacitor

Question 47

What is the unit of electrical power?

Accepted Answer

Watts (W)

Answer

Volts (V)

Answer

Amperes (A)

Answer

Ohms (Ω)

Question 48

Which of the following is a crucial safety precaution to consider when working with electrical circuits?

Accepted Answer

Proper grounding and insulation techniques should be used.

Answer

Using bare hands during electrical work is acceptable.

Answer

It is advisable to work on energized circuits.

Answer

Warning labels about electrical hazards should be ignored.

Question 49

What is the primary purpose of a fuse in an electrical circuit?

Accepted Answer

To protect the circuit from potentially damaging overcurrents.

Answer

To regulate voltage levels in the circuit.

Answer

To store electrical energy in the circuit.

Answer

To increase the overall resistance of the circuit.

Question 50

When comparing alternating current (AC) and direct current (DC) for power transmission, which of the following is a primary advantage of using AC?

Accepted Answer

AC power transmission results in lower power loss over extended distances.

Answer

AC power transmission mandates higher voltage requirements.

Answer

AC is incompatible with electronic devices.

Answer

AC power transmission requires highly specialized equipment.

Question 51

In an electrical circuit, what is the fundamental role of a capacitor?

Accepted Answer

To store electrical energy in the form of an electric field.

Answer

To control and regulate current flow in the circuit.

Answer

To amplify voltage levels in the circuit.