CAAS SAR-66 M04 Electronic Fundamentals (Category B2) — Information & Free Practice
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About CAAS SAR-66 M04 Electronic Fundamentals (Category B2)
CAAS SAR-66 M04 Electronic Fundamentals (Category B2) · SG
Key exam facts
- Provider
- Civil Aviation Authority of Singapore (CAAS), examination authority; delivered by Aspeq Assessment Specialists.
- Format
- Invigilated knowledge examination: multiple-choice questions, each with three alternatives and one correct answer. Independent M04 paper; no essay or practical assessment.
- Exam questions
- Total questions: 40.
- Time limit
- 50 minutes for the Category B2 M04 examination paper.
- Passing score
- 75%; no penalty marking on multiple-choice papers.
- Exam fee
- S$87.20 per examination paper under Air Navigation Order Twelfth Schedule 11(1)(a), for grant, renewal if required, or inclusion/extension of a rating. Portal prices include GST unless otherwise stated; 9% GST applies from 1 January 2026.
Topics covered
Semiconductors
- Diodes
- Diodes (a), Level 2: symbols; characteristics and properties; series and parallel; SCR, LED, photoconductive diode, varistor and rectifier diode uses; functional testing
- Diodes (b), Level 2: materials and electron configuration; P/N doping and carriers; unbiased and biased PN junction; diode parameters; clippers, clampers, rectifiers, bridge, voltage doublers and triplers; detailed SCR, LED, Schottky, photoconductive, varactor, varistor, rectifier and Zener operation
- Transistors
- Transistors (a), Level 2: symbols, description, orientation, characteristics and properties
- Transistors (b), Level 2: PNP/NPN construction and operation; base, collector and emitter configurations; testing; other transistor types; amplifier classes A, B, C; bias, decoupling, feedback, stabilisation; cascades, push-pull, oscillators, multivibrators, flip-flops
- Integrated Circuits
- Integrated Circuits (b), Level 2: logic and linear circuits; op-amp integrator, differentiator, voltage follower, comparator; resistive capacitive, transformer, inductive resistive and direct coupling; positive and negative feedback
Printed Circuit Board, Level 2: description and use of printed circuit boards
Servomechanisms
- Servomechanisms (b), Level 2: open/closed loop, follow up, servomechanism, analogue, transducer, null, damping, feedback and deadband; resolver, differential, control/torque synchros, E/I transformers, inductance/capacitance/synchronous transmitters; defects, lead reversal and hunting
How to prepare
Work through the topics, read the explanation after each answer, and revisit the areas where you miss questions. Use the official outline and reference materials below to guide your study.
These independent practice questions are not actual exam items and do not guarantee a passing result.
Frequently asked questions
What is the exam format?
Invigilated knowledge examination: multiple-choice questions, each with three alternatives and one correct answer. Independent M04 paper; no essay or practical assessment.
How many questions are on the exam?
Total questions: 40.
How long is the exam?
50 minutes for the Category B2 M04 examination paper.
What is the passing score?
75%; no penalty marking on multiple-choice papers.
How much does the exam cost?
S$87.20 per examination paper under Air Navigation Order Twelfth Schedule 11(1)(a), for grant, renewal if required, or inclusion/extension of a rating. Portal prices include GST unless otherwise stated; 9% GST applies from 1 January 2026.
Official sources and references
- CAAS AC 66-13 SAR-66 Basic Examinations
Appendix A, pp.13–14; Category B2
- CAAS AC 66-13 SAR-66 Basic Examinations
Effective Date, p.1
- CAAS SAR-66 Aircraft Maintenance Licensing
Appendix 2, 1.2
- CAAS AC 66-13 SAR-66 Basic Examinations
3.1, p.3, M04 row, Category B2
- CAAS SAR-66 Aircraft Maintenance Licensing
Appendix 2, 1.4
- Air Navigation Order Twelfth Schedule
Twelfth Schedule 11(1)(a)
Confirm current exam arrangements with the exam provider.