100+ Free SAR-66 Module 3 Practice Questions

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2026 Statistics

Key Facts: SAR-66 Module 3 Exam

52 questions

Module M03 MCQ count (Cat B1/B2)

CAAS AC 66-13 (Rev 1)

65 minutes

Time allowed for M03 MCQ (B1/B2)

CAAS AC 66-13 (Rev 1)

20 / 25 min

Cat A M03 MCQ count and time

CAAS AC 66-13 (Rev 1)

75%

Pass mark per SAR-66 module

SAR-66 Appendix 2

10 years

Validity of M03 basic knowledge pass

SAR-66.25

S$87.20

Fee per basic knowledge exam subject (from 1 Jan 2026)

ANO Twelfth Schedule / Air Navigation (Amendment) Order 2025

3 options

Official MCQ choices per question

SAR-66 Appendix 2

CAAS SAR-66 Module 3 Electrical Fundamentals is examined by MCQ only: 52 questions in 65 minutes for Cat B1/B2 (20 in 25 minutes for Cat A) with a 75% pass mark and no penalty marking. Official MCQs use three options; this bank uses four. Content follows the Part-66-aligned Module 3 syllabus from electron theory through DC/AC circuits, magnetism, inductance, transformers and machines. An M03 pass remains valid for 10 years under SAR-66.25.

Sample SAR-66 Module 3 Practice Questions

Try these sample questions to test your SAR-66 Module 3 exam readiness. Each question includes a detailed explanation. Start the interactive quiz above for the full 100+ question experience with AI tutoring.

1In the Bohr model used in SAR-66 Module 3, which particle carries a negative charge and orbits the nucleus?

A.Neutron

B.Proton

C.Alpha particle

D.Electron

Explanation: Electrons are negatively charged and 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 only

Explanation: Good conductors (e.g. copper, silver) have few valence electrons that are free to move, giving low resistivity.

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 (silicon, germanium) define semiconductor behaviour, with conductivity between conductors and insulators.

4According 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; unlike charges attract. This is the basic electrostatic law in Module 3.

5Coulomb'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: F = k Q1 Q2 / d². Force falls with the square of separation (inverse-square law).

6The SI unit of electric charge is the:

A.Coulomb

B.Volt

C.Ohm

D.Ampere

Explanation: Charge is measured in coulombs (C). One coulomb is the charge transferred by one ampere in one second.

7Conventional current flow is defined as the direction of:

A.Magnetic flux around a conductor

B.Positive charge flow from positive to negative

C.Electron flow from negative to positive

D.Ion flow only in electrolytes

Explanation: Conventional current is taken as positive-to-negative (the historical positive-charge direction). Electron flow is opposite: negative to positive.

8Electromotive force (EMF) of a source is best described as:

A.The magnetic field strength around the source

B.The resistance of the load connected to the source

C.The energy per unit charge that the source can supply

D.The current delivered into a short circuit only

Explanation: EMF is the energy supplied per unit charge by a source (volts). Terminal PD may be lower than EMF when current flows due to internal resistance.

9Which method of generating electricity relies on relative motion between a conductor and a magnetic field?

A.Piezoelectric effect

B.Photoelectric effect

C.Electromagnetic induction

D.Thermoelectric (Seebeck) effect

Explanation: Moving a conductor in a magnetic field (or changing flux linkage) induces an EMF — Faraday's law / electromagnetic generation.

10A thermocouple generates an EMF primarily from:

A.A temperature difference at a junction of dissimilar metals

B.Light falling on a semiconductor junction

C.Friction between dissimilar metals

D.Chemical action in an electrolyte

Explanation: The Seebeck (thermoelectric) effect produces an EMF when dissimilar metals form a junction at different temperatures — used in thermocouples.

About the SAR-66 Module 3 Exam

CAAS SAR-66 Module M03 (Electrical Fundamentals) is a basic knowledge module required for Singapore Aircraft Maintenance Licence categories A, B1 and B2. It covers electron theory and static electricity, electrical terminology, generation of electricity, DC sources and circuits, resistance and power, capacitance, magnetism and inductance, DC machines, and AC theory including transformers, filters and AC machines. Per AC 66-13 (Rev 1), Cat B1/B2 sit 52 MCQs in 65 minutes (Cat A: 20 in 25 minutes) with a 75% pass mark. Unlike Modules 07/09/10, Module 3 is MCQ only.

Questions

52 scored questions

Time Limit

65 minutes (B1/B2); 25 minutes (Cat A)

Passing Score

75%

Exam Fee

S$87.20 per basic knowledge examination subject (Air Navigation Order Twelfth Schedule, rate from 1 January 2026; previously S$80). Confirm on CAPELS/exam booking. (Civil Aviation Authority of Singapore (CAAS); book via CAPELS PID and the CAAS Examination Portal)

SAR-66 Module 3 Exam Content Outline

12%

Electron Theory, Static Electricity & Terminology

Atomic structure, conductors/semiconductors/insulators, electrostatics, Coulomb's law, EMF/PD/current/conductance and generation methods

DC Sources of Electricity

Primary/secondary cells, lead-acid and Ni-Cd batteries, series/parallel connection, internal resistance, thermocouples and photocells

12%

DC Circuits — Ohm's & Kirchhoff's Laws

Ohm's law calculations, KCL/KVL, series and parallel networks, voltage dividers and supply internal resistance

14%

Resistance, Resistors & Power

Resistivity, temperature coefficient, colour code, potentiometers, thermistors, Wheatstone bridge, power and energy

10%

Capacitance & Capacitors

Capacitance definition, plate/dielectric factors, series/parallel capacitors, RC time constant, energy and voltage ratings

14%

Magnetism & Inductance

Magnetic fields, permeability, Faraday/Lenz, self and mutual inductance, LR time constant, hysteresis, eddy currents and saturation

10%

DC Motor/Generator Theory

Commutation, back EMF, series/shunt/compound machines, Fleming's rules, armature reaction and interpoles

20%

AC Theory, Transformers, Filters & Machines

RMS/average/peak, 400 Hz aircraft AC, reactance, resonance, power factor, transformers, filters, AC generators and motors

How to Pass the SAR-66 Module 3 Exam

What You Need to Know

Passing score: 75%
Exam length: 52 questions
Time limit: 65 minutes (B1/B2); 25 minutes (Cat A)
Exam fee: S$87.20 per basic knowledge examination subject (Air Navigation Order Twelfth Schedule, rate from 1 January 2026; previously S$80). Confirm on CAPELS/exam booking.

Keys to Passing

Complete 500+ practice questions
Score 80%+ consistently before scheduling
Focus on highest-weighted sections
Use our AI tutor for tough concepts

SAR-66 Module 3 Study Tips from Top Performers

1Drill Ohm's law, series/parallel equivalents and Kirchhoff loops until calculations are automatic under time pressure

2Memorise RMS = peak/√2, average ≈ 0.637×peak for a sine, and aircraft AC at 400 Hz

3Know Faraday/Lenz, XL = 2πfL, XC = 1/(2πfC), and series resonance (Z ≈ R)

4Separate lead-acid (H₂SO₄) from Ni-Cd (KOH) chemistry, and series vs parallel cell effects on V and Ah

5Practise transformer turns ratio and distinguish copper loss (I²R) from core loss (hysteresis + eddy)

6Remember CAAS logistics: B1/B2 52 MCQs in 65 minutes (Cat A 20/25), 75% pass, M03 validity 10 years, book via CAPELS/CAAS Examination Portal

Frequently Asked Questions

How many questions are on the CAAS SAR-66 Module 3 MCQ and how long is it?

Per CAAS AC 66-13 (Rev 1), Module M03 Electrical Fundamentals has 52 multiple-choice questions with 65 minutes for categories B1 and B2, or 20 questions with 25 minutes for category A.

What is the pass mark for Module 3?

SAR-66 Appendix 2 sets the pass mark for each module at 75%. Penalty marking is not applied on multiple-choice papers.

Does Module 3 include an essay paper under SAR-66?

No. Module 3 is MCQ only. The combined M50 essay paper covers Modules 07, 09 and 10, not Module 3.

How long does a Module 3 pass remain valid?

Under SAR-66.25, a pass in a basic knowledge examination paper for Module M03 is valid for 10 years for licence application purposes (Human Factors M09 and Aviation Legislation M10 MCQ/essay passes are each valid for 5 years).

What does the official MCQ format look like?

SAR-66 Appendix 2 states each multiple-choice question has three answers of which only one is correct, with a nominal average of about 75 seconds per question. This free bank uses four options to make practice harder.

What is the examination fee?

The Air Navigation Order Twelfth Schedule fee for each subject of a basic knowledge examination is S$87.20 from 1 January 2026 (updated from S$80). Confirm the live fee when booking on the CAAS Examination Portal.

What syllabus does Module 3 follow?

Electrical Fundamentals aligned with Part-66 Module 3: electron theory and static electricity, terminology, generation of electricity, DC sources and circuits, resistance/power, capacitance, magnetism, inductance, DC machines, AC theory, RLC circuits, transformers, filters, and AC generators/motors.