Free Practice Questions for Module 3 Electrical Fundamentals

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Sample Module 3 Electrical Fundamentals Practice Questions

Try these sample questions to review concepts for the Module 3 Electrical Fundamentals exam. Each question includes a detailed explanation. Start the interactive quiz above for the full 100+ question experience with AI tutoring.

1In the Bohr atomic model used in Module 3 electron theory, which particle orbits the nucleus and carries a negative charge?

A.Proton

B.Neutron

C.Electron

D.Positron

Explanation: Electrons are negatively charged particles that occupy shells around the nucleus. Their movement between atoms is the basis of electric current in conductors.

2A material whose atoms typically have one to three loosely held valence electrons is best classified as a:

A.Insulator

B.Conductor

C.Semiconductor

D.Dielectric

Explanation: Good conductors such as copper and silver have few valence electrons that are free to move, giving low resistivity and easy electron flow.

3Atoms with exactly four valence electrons are typically classified in Module 3 as:

A.Superconductors

B.Electrolytes

C.Semiconductors

D.Perfect conductors

Explanation: Four valence electrons, as in silicon and germanium, define semiconductor behaviour with conductivity between conductors and insulators.

4The SI unit of electric charge is the:

A.Ampere

B.Volt

C.Coulomb

D.Ohm

Explanation: Electric charge is measured in coulombs (C). One coulomb equals the charge transferred by one ampere flowing for one second.

5According to the electrostatic law of attraction and repulsion, two bodies with like charges will:

A.Attract each other

B.Repel each other

C.Produce no force

D.Always become neutral

Explanation: Like charges repel and unlike charges attract. This is the basic electrostatic law covered in Module 3 static electricity.

6Coulomb's law states that the electrostatic force between two point charges is proportional to the product of the charges and:

A.Inversely proportional to the distance

B.Directly proportional to the distance

C.Inversely proportional to the square of the distance

D.Independent of distance

Explanation: Coulomb's law is F = k Q1 Q2 / d². The force falls with the square of the separation (inverse-square law).

7An excess of electrons on an isolated body means that body is:

A.Positively charged

B.Negatively charged

C.Magnetically polarised only

D.Electrically neutral

Explanation: Electrons carry negative charge, so an excess of electrons makes the body negatively charged.

8Conduction current in a metal wire is primarily the drift of:

A.Protons through the lattice

B.Free electrons through the lattice

C.Neutrons between atoms

D.Entire atoms along the wire

Explanation: In metallic conductors, free (valence) electrons drift under an electric field, producing conduction current while the positive ions remain fixed in the lattice.

9Electromotive force (EMF) is best described as:

A.The opposition to current in a conductor

B.The energy per unit charge provided by a source

C.The rate of flow of charge

D.The product of current and resistance only

Explanation: EMF is the energy supplied by a source per unit charge (joules per coulomb = volts). It is the driving potential that can produce current in a closed circuit.

10Potential difference (PD) between two points in a circuit is the:

A.Work done moving one coulomb between those points

B.Total charge stored in the circuit

C.Magnetic flux linking the conductors

D.Frequency of the supply

Explanation: Potential difference in volts equals work in joules needed to move one coulomb of charge between the two points.

About the Module 3 Electrical Fundamentals Exam

The Civil Aviation Authority of Sri Lanka (CAASL) Aircraft Maintenance Licence (AML) Module 3 Electrical Fundamentals examination is a mandatory theoretical knowledge module under CAASL Implementing Standard IS-66 (Issue 03, 02 April 2026). The syllabus aligns with Part-66 Module 3 and covers electron theory, electrostatics and conduction, electrical terminology, generation of electricity, DC sources, DC circuits, resistors, power, capacitors, magnetism, inductors, DC motor/generator theory, AC theory, RCL circuits, transformers, and filters. For Category B1, B2 and B2L, the official Module 3 paper is 52 multiple-choice questions with 0 essay questions and a time allowance of 65 minutes. Category B3 sits a shorter 24-question paper in 30 minutes. A passing score of 75% is required. Examinations are administered at the CAASL Examination Center; AML examination sittings are typically scheduled in April, August and December. Preparation should emphasise Ohm's and Kirchhoff's laws, series/parallel networks, capacitive and inductive reactance, impedance and power factor, transformer turns ratio, and filter behaviour, using IS-66 Module 3 learning objectives and SLCAP 3070 guidance together with timed practice under B1-style constraints.

Exam sponsor: Civil Aviation Authority of Sri Lanka (CAASL) Examination Center. The requirements and fees below concern the certification or admission exam, separate from our free practice resources.

Questions

52 questions

Time Limit

65 minutes

Passing Score

75%

Exam / Certification Fees

See SLCAP 7100 (CAASL fees schedule)

Exam sponsor website

Fees, eligibility, and exam policies can change. Confirm them with the exam sponsor before applying or paying.

Official sources

Civil Aviation Authority of Sri Lanka (CAASL) Examination Center: official exam information

Our practice resources: topics covered

We aim to reflect publicly available exam outlines and topic information in our study resources. Coverage, format, and difficulty may differ from the actual exam, and we cannot guarantee that every detail is accurate or current. Confirm exam requirements, fees, and policies with the official exam sponsor.

25%

Electrostatics and DC Sources

Electron theory, static electricity, conductors, chemical cells, and battery fundamentals.

25%

DC Resistive Circuits and Components

Ohm's Law, Kirchhoff's laws, resistor configurations, power, and efficiency.

25%

Electromagnetism, Capacitance, and Inductance

Magnetic fields, electromagnetic induction, capacitors, inductors, and time constants.

25%

AC Theory, Circuits, and Components

AC wave parameters, RCL circuits, impedance, power factor, transformers, and filters.

Preparing for the Module 3 Electrical Fundamentals Exam

What You Need to Know

Passing score: 75%
Exam length: 52 questions
Time limit: 65 minutes
Exam / certification fees: See SLCAP 7100 (CAASL fees schedule) Official sources

Using Our Practice Resources

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Module 3 Electrical Fundamentals: Suggested Study Strategy

1Master algebra for Ohm's law, power, series/parallel resistance, reactance, impedance, and transformer turns-ratio calculations.

2Know the differences between lead-acid and nickel-cadmium cells used in aircraft systems, including charge behaviour and thermal-runaway risk for Ni-Cd.

3Practice equivalent resistance, capacitance, and inductance for series and parallel networks until the rules are automatic.

4Memorise XC = 1/(2πfC) and XL = 2πfL, and relate them to impedance and power factor in RCL circuits.

5Drill RMS/peak/peak-to-peak relationships for sine waves and transformer primary/secondary voltage and current ratios under the ideal transformer assumption.

Frequently Asked Questions

How many questions are on the official CAASL AML Module 3 exam for Category B1/B2/B2L?

Per IS-66 Issue 03, Category B1, B2 and B2L Module 3 contains 52 multiple-choice questions and 0 essay questions.

What is the time limit for the CAASL AML Module 3 exam (Category B1/B2/B2L)?

You are allowed 65 minutes to complete the Category B1, B2 and B2L Module 3 paper.

What is the Category B3 Module 3 exam format?

Category B3 Module 3 is 24 multiple-choice questions with 0 essay questions and 30 minutes allowed.

What is the passing score for the CAASL AML Module 3 exam?

The passing score is 75%. For a 52-question B1/B2/B2L paper that means at least 39 correct answers.

Where are CAASL AML Module 3 examinations held?

Exams are administered by the Civil Aviation Authority of Sri Lanka (CAASL) at the CAASL Examination Center. AML sittings are typically held in April, August and December.

Which official documents define Module 3 requirements?

CAASL Implementing Standard IS-66 (Issue 03) sets the Module 3 examination criteria and syllabus alignment; related AML guidance is also published in SLCAP 3070.