100+ Free GCAA CAR-66 B2 Exam Practice Questions

Pass your UAE GCAA CAR-66 Aircraft Maintenance Engineer Licence - Category B2 (Avionics) exam on the first try — instant access, no signup required.

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Sample GCAA CAR-66 B2 Exam Practice Questions

Try these sample questions to test your GCAA CAR-66 B2 Exam exam readiness. Each question includes a detailed explanation. Start the interactive quiz above for the full 100+ question experience with AI tutoring.

1In a purely capacitive AC circuit, what is the phase relationship between the current and the applied voltage?

A.Current and voltage are in phase

B.Current lags voltage by 90 degrees

C.Current leads voltage by 90 degrees

D.Current leads voltage by 45 degrees

Explanation: In a purely capacitive circuit the capacitor must charge before a voltage appears across it, so current flow precedes the voltage. The current therefore leads the applied voltage by exactly 90 degrees (ICE: in a Capacitor, I leads E).

2A resistor of 4 ohms is connected in series with an inductive reactance of 3 ohms across an AC supply. What is the circuit impedance?

A.1 ohm

B.5 ohms

C.7 ohms

D.12 ohms

Explanation: In a series R-L circuit, impedance is the vector sum Z = sqrt(R squared + X squared). Here Z = sqrt(4 squared + 3 squared) = sqrt(16 + 9) = sqrt(25) = 5 ohms.

3What is the primary function of a Wheatstone bridge circuit as used in aircraft instrumentation?

A.To rectify alternating current to direct current

B.To accurately measure an unknown resistance by balancing the bridge

C.To amplify a small DC voltage

D.To store electrical charge for later release

Explanation: A Wheatstone bridge compares an unknown resistance against known resistances. When the bridge is balanced, no current flows through the detector and the unknown value can be calculated. It is widely used in temperature and strain (resistive transducer) measurement circuits.

4Three capacitors of 2 microfarads each are connected in parallel. What is the total capacitance?

A.0.67 microfarads

B.2 microfarads

C.6 microfarads

D.8 microfarads

Explanation: Capacitors in parallel add directly because the plate areas effectively combine. Total = 2 + 2 + 2 = 6 microfarads. This is the opposite rule to resistors, where parallel values produce a smaller total.

5In a transformer, if the primary has 200 turns and the secondary has 50 turns, and 240 V AC is applied to the primary, what is the secondary voltage (ignoring losses)?

A.60 V

B.120 V

C.480 V

D.960 V

Explanation: The turns ratio determines the voltage ratio: Vs = Vp x (Ns/Np) = 240 x (50/200) = 240 x 0.25 = 60 V. Because the secondary has fewer turns, this is a step-down transformer.

6What does the RMS value of an AC sinusoidal voltage represent?

A.The maximum instantaneous voltage reached in each cycle

B.The average of all instantaneous values over one cycle

C.The DC value that would produce the same heating effect

D.The voltage measured at the zero crossing point

Explanation: The root-mean-square (RMS) value is the equivalent DC value that dissipates the same power in a resistive load. For a sine wave, RMS = peak x 0.707. AC voltmeters and system ratings are normally given in RMS.

7When a P-N junction diode is reverse biased, what happens to current flow?

A.Large forward current flows freely

B.Only a very small leakage current flows

C.Current flows equally in both directions

D.The junction immediately short circuits

Explanation: Under reverse bias the depletion region widens and blocks majority carrier flow, so only a tiny leakage (reverse saturation) current flows. This blocking action is why diodes are used as rectifiers and one-way valves for current.

8A Zener diode is most commonly used in aircraft electronic circuits to provide which function?

A.Signal amplification

B.Voltage regulation

C.Frequency multiplication

D.Logic level inversion

Explanation: A Zener diode operates in reverse breakdown at a precise voltage and maintains that voltage across itself despite current changes. This makes it ideal as a voltage regulator or reference in power supply circuits.

9In a bipolar junction transistor used as an amplifier, which terminal current controls the much larger collector current?

A.The base current

B.The emitter current

C.The collector current itself

D.The substrate current

Explanation: A bipolar junction transistor is a current-controlled device in which a small base current controls a much larger collector current. The ratio of collector to base current is the current gain (hFE or beta).

10An ideal operational amplifier is characterised by which set of properties?

A.Zero gain, zero input impedance, infinite output impedance

B.Infinite open-loop gain, infinite input impedance, zero output impedance

C.Unity gain, infinite input impedance, infinite output impedance

D.Infinite gain, zero input impedance, infinite output impedance

Explanation: The ideal op-amp model assumes infinite open-loop gain, infinite input impedance (drawing no input current) and zero output impedance (driving any load without voltage drop). These assumptions simplify analysis of feedback amplifier circuits.

About the GCAA CAR-66 B2 Exam Exam

The GCAA CAR-66 Category B2 licence certifies aircraft maintenance engineers to carry out and certify line and base maintenance on aircraft electrical and avionic systems. CAR-66 is the UAE equivalent of EASA Part-66, and B2 candidates sit modular basic-knowledge multiple-choice examinations at the higher knowledge level required for avionics, covering electrical and electronic fundamentals, digital techniques and electronic instrument systems, avionic systems, maintenance practices, human factors and legislation.

Assessment

Modular multiple-choice basic-knowledge examinations covering the B2 modules (M1-M10, M13 and M14). Each module is examined separately, with question counts scaled to the module and required knowledge level.

Time Limit

Set per module; multiple-choice exams allow about 75 seconds per question, so each module's time depends on its question count.

Passing Score

A minimum of 75% is required to pass each multiple-choice basic-knowledge module, consistent with the EASA Part-66 standard CAR-66 follows. There is no negative marking in the basic multiple-choice format.

Exam Fee

Per-module examination fees are set by the GCAA-approved Part-147 examination organisation and vary by module and provider. Confirm current fees with your approved centre. (General Civil Aviation Authority (GCAA), United Arab Emirates)

GCAA CAR-66 B2 Exam Exam Content Outline

14%

Electrical Fundamentals (M3)

DC and AC theory, Ohm's law, power, capacitance, inductance, transformers, resonance, motors and circuit protection.

12%

Electronic Fundamentals (M4)

Semiconductors, diodes, transistors, operational amplifiers, rectifiers, servomechanisms, synchros and thermocouples.

16%

Digital Techniques and EIS (M5)

Numbering systems, logic gates, flip-flops, data conversion, multiplexing, data buses, fibre optics and electronic instrument systems.

30%

Avionic Systems (M13)

Autoflight, communications, navigation, surveillance, air data, instruments, electrical power and integrated modular avionics.

12%

Maintenance Practices (M7)

ESD handling, wiring, crimping, connectors, torque, bonding and insulation testing, calibrated test equipment and troubleshooting.

Human Factors (M9)

The Dirty Dozen, fatigue, distraction, error management and safety culture.

Aviation Legislation (M10)

CAR-66 licence privileges, certification, release to service, approved data and records.

Aerodynamics and Propulsion (M8/M13/M14)

Theory of flight, high-speed flight and propulsion basics including FADEC and engine indication relevant to B2.

How to Pass the GCAA CAR-66 B2 Exam Exam

What You Need to Know

Passing score: A minimum of 75% is required to pass each multiple-choice basic-knowledge module, consistent with the EASA Part-66 standard CAR-66 follows. There is no negative marking in the basic multiple-choice format.
Assessment: Modular multiple-choice basic-knowledge examinations covering the B2 modules (M1-M10, M13 and M14). Each module is examined separately, with question counts scaled to the module and required knowledge level.
Time limit: Set per module; multiple-choice exams allow about 75 seconds per question, so each module's time depends on its question count.
Exam fee: Per-module examination fees are set by the GCAA-approved Part-147 examination organisation and vary by module and provider. Confirm current fees with your approved centre.

Keys to Passing

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

GCAA CAR-66 B2 Exam Study Tips from Top Performers

1Build a strong foundation in modules M3, M4 and M5 first, because electrical and electronic fundamentals and digital techniques underpin almost every avionic system question at B2 level.

2Practise the M13 avionic systems thoroughly, learning how communications, navigation, autoflight, air data and electrical power systems interconnect, since M13 carries the largest share of B2 content.

3Do not neglect human factors (M9), legislation (M10) and maintenance practices (M7); these are high-yield, easily revised topics that reliably appear in the modular examinations.

Frequently Asked Questions

What does the GCAA CAR-66 Category B2 licence cover?

The Category B2 licence certifies aircraft maintenance engineers to carry out and certify line and base maintenance on aircraft electrical and avionic systems. It is the avionics counterpart to the Category B1 licence, which covers airframe and engine mechanical systems.

How is the CAR-66 B2 examination structured?

B2 candidates sit modular basic-knowledge multiple-choice examinations for the required modules (M1-M10, M13 and M14) at the higher knowledge level for avionics. Each module is examined separately, with the question count scaled to the module and knowledge level required.

What is the pass mark for a CAR-66 B2 module exam?

A minimum of 75% is required to pass each multiple-choice basic-knowledge module, in line with the EASA Part-66 standard that CAR-66 mirrors. There is no negative marking in the basic multiple-choice format.

Is GCAA CAR-66 the same as EASA Part-66?

CAR-66 is the UAE General Civil Aviation Authority's aircraft maintenance engineer licensing regulation and closely mirrors EASA Part-66, including the module structure and the 75% pass standard, so EASA Part-66 study material is largely applicable.