Electrical Engineering Fundamentals: Master Electrical Circuits, Power Systems, and Electronic Devices

Question 1

Which formula calculates the power dissipated in a resistor?

Accepted Answer

P = I * R

Answer

P = V / R

Answer

P = I / V

Answer

P = V * I

Question 2

What formula calculates the reactance of a capacitor?

Accepted Answer

Xc = 1 / (2 * pi * f * C)

Answer

Xc = 2 * pi * f * C

Answer

Xc = f / (2 * pi * C)

Answer

Xc = 2 * pi * C / f

Question 3

Which formula calculates the power factor?

Accepted Answer

PF = cos(theta)

Answer

PF = sin(theta)

Answer

PF = tan(theta)

Answer

PF = cot(theta)

Question 4

Which formula calculates the efficiency of a transformer?

Accepted Answer

Efficiency = (Output power / Input power) * 100%

Answer

Efficiency = (Input power / Output power) * 100%

Answer

Efficiency = (Output current / Input current) * 100%

Answer

Efficiency = (Input current / Output current) * 100%

Question 5

In power transmission systems, transformers play a critical role. Explain their function and discuss the different types commonly used.

Accepted Answer

Transformers enable efficient voltage conversion for long-distance electricity distribution by altering AC voltage levels.

Answer

Transformers are exclusively used in DC power systems.

Answer

All transformers have the same design and functionality, regardless of their application.

Answer

Transformers are non-essential components in power transmission systems and do not contribute to efficient electricity delivery.

Question 6

What physical quantity is the measure of electrical current?

Accepted Answer

Ampere

Answer

Volt

Answer

Ohm

Answer

Watt

Question 7

Which circuit type offers an uninterrupted path for current to flow?

Accepted Answer

Closed circuit

Answer

Parallel circuit

Answer

Open circuit

Answer

Series circuit

Question 8

Which material below exhibits semiconducting properties?

Accepted Answer

Silicon

Answer

Copper

Answer

Gold

Answer

Aluminum

Question 9

What is the main function of a diode in an electrical circuit?

Accepted Answer

Regulate the flow of current

Answer

Amplify electrical signals

Answer

Store electrical charge

Answer

Generate voltage

Question 10

What is the main purpose of a transformer in an electrical system?

Accepted Answer

Modify voltage levels

Answer

Isolate circuits

Answer

Control current flow

Answer

Store energy

Question 11

What is the primary safety concern associated with electrical systems?

Accepted Answer

Electrical Shock

Answer

Fire hazard

Answer

Chemical burns

Answer

Mechanical damage

Question 12

Which of the following is a recognized electrical safety regulation in the United Kingdom?

Accepted Answer

BS 7671: Requirements for Electrical Installations

Answer

NEC: National Electrical Code

Answer

IEC 60364: Electrical Installations of Buildings

Answer

ANSI/IEEE C2: National Electrical Safety Code

Question 13

Identify the potential risks associated with operating high-power electrical equipment and describe measures to mitigate these risks.

Accepted Answer

Electric shock, burns, and electrical fires

Accepted Answer

Using protective gear and adhering to safety protocols

Answer

Electric shock only

Answer

Using low-power equipment only

Question 14

What is the SI unit of electrical resistance?

Accepted Answer

Ohm

Answer

Ampere

Answer

Volt

Answer

Watt

Question 15

Which of the following equations represents Ohm's Law?

Accepted Answer

V = IR

Answer

V = I/R

Answer

R = V/I

Answer

R = I/V

Question 16

What type of circuit has only one pathway for current to flow?

Accepted Answer

Series circuit

Answer

Parallel circuit

Answer

Combination circuit

Answer

Closed circuit

Question 17

What is the primary function of a transformer?

Accepted Answer

To change the voltage of an alternating current (AC) signal

Answer

To change the frequency of an AC signal

Answer

To convert AC to direct current (DC)

Answer

To convert DC to AC

Question 18

What is the main purpose of a capacitor in an electrical circuit?

Accepted Answer

To store energy in an electric field

Answer

To limit current flow

Answer

To provide a voltage reference

Answer

To dissipate energy

Question 19

Which principle is the basis of electric motor operation?

Accepted Answer

Electromagnetic induction

Answer

Piezoelectric effect

Answer

Thermoelectric effect

Answer

Hall effect

Question 20

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

Accepted Answer

Battery

Answer

Resistor

Answer

Capacitor

Answer

Inductor

Question 21

Which of the following is not a type of electrical circuit?

Accepted Answer

Magnetic circuit

Answer

AC circuit

Answer

DC circuit

Answer

RLC circuit

Question 22

The standard unit used to measure electrical current is the:

Accepted Answer

Ampere

Answer

Ohm

Answer

Coulomb

Answer

Volt

Question 23

The fundamental principle governing the operation of a transformer is:

Accepted Answer

Electromagnetic induction

Answer

Conduction

Answer

Capacitance

Answer

Transistor action

Question 24

Which device is specifically designed to measure electrical power in a circuit?

Accepted Answer

Wattmeter

Answer

Ammeter

Answer

Ohmmeter

Answer

Voltmeter

Question 25

The primary distinction between alternating current (AC) and direct current (DC) is that:

Accepted Answer

AC changes direction while DC flows in one direction

Answer

AC has higher voltage than DC

Answer

AC is used for lighting while DC is used for batteries

Answer

DC is more efficient than AC

Question 26

Which of the following is a protective device commonly used in electrical circuits to prevent damage from overcurrent?

Accepted Answer

Fuse

Answer

Capacitor

Answer

Inductor

Answer

Transistor

Question 27

The primary function of a resistor in an electrical circuit is to:

Accepted Answer

Limit the flow of current

Answer

Amplify signals

Answer

Store electrical energy

Answer

Enhance voltage

Question 28

The main purpose of a capacitor in an electrical circuit is to:

Accepted Answer

Store electrical charge

Answer

Isolate components

Answer

Reduce noise

Answer

Regulate voltage

Question 29

Which of the following is the SI unit of electric current?

Accepted Answer

Ampere (A)

Answer

Volt (V)

Answer

Ohm (Ω)

Answer

Watt (W)

Question 30

According to Ohm's law, which formula is used to calculate the resistance of a conductor?

Accepted Answer

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

Answer

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

Answer

Resistance (R) = Current (I)^2 / Voltage (V)

Answer

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

Question 31

Which type of electrical circuit allows electricity to flow in only one direction?

Accepted Answer

Direct Current (DC) circuit

Answer

Series circuit

Answer

Parallel circuit

Answer

Alternating Current (AC) circuit

Question 32

What is the primary function of a transformer in an electrical system?

Accepted Answer

To change the voltage of an Alternating Current (AC) electrical signal

Answer

To regulate the flow of current

Answer

To store electrical energy

Answer

To convert Alternating Current (AC) to Direct Current (DC)

Question 33

Which of the following is NOT a type of renewable energy source?

Accepted Answer

Natural gas

Answer

Solar power

Answer

Wind power

Question 34

What is the primary function of a diode in an electrical circuit?

Accepted Answer

To allow current to flow in only one direction

Answer

To regulate voltage

Answer

To store charge

Answer

To amplify signals

Question 35

Which of the following is a key performance indicator used to evaluate the efficiency of an electrical system?

Accepted Answer

Power factor

Answer

Bandwidth

Answer

Bit rate

Answer

Signal-to-noise ratio

Question 36

What is the primary purpose of a Ground Fault Circuit Interrupter (GFCI) in an electrical system?

Accepted Answer

To protect against electrical shocks

Answer

To store energy

Answer

To regulate voltage

Answer

To prevent power surges

Question 37

In a series circuit, the current:

Accepted Answer

Has the same value at all points

Answer

Is inversely proportional to the resistance

Answer

Is zero at some points

Answer

Has different values at different points

Question 38

Which of the following is NOT a fundamental component of a power system?

Accepted Answer

Distributed system

Answer

Generation system

Answer

Transmission system

Answer

Distribution system

Question 39

The primary function of a transformer is to:

Accepted Answer

Change AC voltage and current levels

Answer

Store electrical energy

Answer

Convert AC to DC

Question 40

Which of the following is an example of an active electronic device?

Accepted Answer

Transistor

Answer

Resistor

Answer

Capacitor

Answer

Inductor

Question 41

The purpose of a diode is to:

Accepted Answer

Permit current flow in a single direction

Answer

Protect against electrical faults

Answer

Store electrical energy

Answer

Amplify signals

Question 42

Which material is commonly used as a semiconductor?

Accepted Answer

Silicon

Answer

Copper

Answer

Steel

Answer

Aluminum

Question 43

The SI unit of electrical power is the:

Accepted Answer

Watt

Answer

Ampere

Answer

Volt

Answer

Ohm

Question 44

The power factor of a circuit is defined as the:

Accepted Answer

Ratio of real power to apparent power

Answer

Ratio of apparent power to real power

Answer

Product of real and apparent power

Answer

Difference between real and apparent power

Question 45

The primary purpose of a circuit breaker is to:

Accepted Answer

Protect circuits from excessive current

Answer

Amplify signals

Answer

Store electrical energy

Answer

Convert AC to DC