NCATT AET (AVIATION ELECTRONICS TECHNICIAN) CERTIFICATION EXAM
2025/2026 | Questions and Correct Answers | Verified Competency Format
Aircraft Electronics Technician Certification | Key Domains: Basic Electronics, Digital
Devices/Microprocessors, Aircraft Wiring, Communications & Navigation Systems,
Troubleshooting & Maintenance, Aircraft Fundamentals, Regulatory & Safety Practices |
Expert-Structured Q&A
Introduction
This NCATT AET Certification Exam resource is designed for 2025/2026 candidates preparing
for the Aircraft Electronics Technician (AET) certification. It covers core knowledge areas
defined in the NCATT AET Standard, including electronics theory, systems maintenance,
avionics fundamentals, troubleshooting, and safety practices. The format supports practical and
theoretical understanding assessed during the actual certification process.
Answer Format
All correct answers appear in bold, with rationales that explain the technical reasoning, safety
implications, and aviation-specific considerations.
DOMAIN 1 – BASIC ELECTRONICS (Questions 1–20)
1. In a series resistive circuit with three 1 kΩ resistors and a 12 V supply, what is the current
through each resistor?
A. 4 mA
B. 12 mA
C. 36 mA
D. 3 mA
Rationale: Total R = 3 kΩ; I = V/R = 12 V / 3 kΩ = 4 mA (same through each series
component).
2. The time constant (τ) of an RC circuit with R = 10 kΩ and C = 0.1 µF is:
A. 1 ms
B. 1 ms
C. 10 ms
D. 0.1 ms
Rationale: τ = RC = 10 kΩ × 0.1 µF = 1 ms.
3. A capacitor labeled “104” has a value of:
A. 10 µF
B. 0.1 µF
C. 100 nF
D. 10 nF
Rationale: “104” = 10 × 10⁴ pF = 100,000 pF = 0.1 µF.
4. The peak-to-peak voltage of a 10 Vrms sine wave is approximately:
A. 14.1 V
B. 28.3 V
, C. 20 V
D. 10 V
Rationale: Vpp = 2 × √2 × Vrms ≈ 2.828 × 10 = 28.3 V.
5. A transformer with a 5:1 turns ratio and 120 V primary will output:
A. 24 V
B. 24 V
C. 12 V
D. 600 V
Rationale: Secondary = Primary / ratio = = 24 V.
6. The impedance of a 1 µF capacitor at 1 kHz is about:
A. 160 Ω
B. 160 Ω
C. 1.6 kΩ
D. 16 Ω
Rationale: Xc = 1/(2πfC) = 1/(2π × 1 kHz × 1 µF) ≈ 159 Ω.
7. A diode in series with a load and 12 V supply drops 0.7 V. The load voltage is:
A. 12 V
B. 11.3 V
C. 0.7 V
D. 12.7 V
Rationale: 12 V – 0.7 V = 11.3 V.
8. The color code for a 4.7 kΩ ±5 % resistor is:
A. Yellow-Violet-Red-Gold
B. Yellow-Violet-Red-Gold
C. Yellow-Violet-Brown-Gold
D. Red-Violet-Red-Gold
Rationale: Yellow (4), Violet (7), Red (00), Gold (±5 %) = 4700 Ω.
9. A 2N3904 is a:
A. PNP power transistor
B. NPN small-signal transistor
C. MOSFET
D. SCR
Rationale: 2N3904 is an NPN general-purpose transistor.
10.The gain (dB) of an amplifier that doubles the input voltage is:
A. 3 dB
B. 6 dB
C. 10 dB
D. 20 dB
Rationale: Voltage gain in dB = 20 log₁₀(2) ≈ 6 dB.
11.A low-pass filter with R = 1 kΩ and C = 0.01 µF has a cut-off frequency of:
A. 15.9 kHz
B. 15.9 kHz
C. 1.59 kHz
D. 159 Hz
Rationale: fc = 1/(2πRC) ≈ 15.9 kHz.
2025/2026 | Questions and Correct Answers | Verified Competency Format
Aircraft Electronics Technician Certification | Key Domains: Basic Electronics, Digital
Devices/Microprocessors, Aircraft Wiring, Communications & Navigation Systems,
Troubleshooting & Maintenance, Aircraft Fundamentals, Regulatory & Safety Practices |
Expert-Structured Q&A
Introduction
This NCATT AET Certification Exam resource is designed for 2025/2026 candidates preparing
for the Aircraft Electronics Technician (AET) certification. It covers core knowledge areas
defined in the NCATT AET Standard, including electronics theory, systems maintenance,
avionics fundamentals, troubleshooting, and safety practices. The format supports practical and
theoretical understanding assessed during the actual certification process.
Answer Format
All correct answers appear in bold, with rationales that explain the technical reasoning, safety
implications, and aviation-specific considerations.
DOMAIN 1 – BASIC ELECTRONICS (Questions 1–20)
1. In a series resistive circuit with three 1 kΩ resistors and a 12 V supply, what is the current
through each resistor?
A. 4 mA
B. 12 mA
C. 36 mA
D. 3 mA
Rationale: Total R = 3 kΩ; I = V/R = 12 V / 3 kΩ = 4 mA (same through each series
component).
2. The time constant (τ) of an RC circuit with R = 10 kΩ and C = 0.1 µF is:
A. 1 ms
B. 1 ms
C. 10 ms
D. 0.1 ms
Rationale: τ = RC = 10 kΩ × 0.1 µF = 1 ms.
3. A capacitor labeled “104” has a value of:
A. 10 µF
B. 0.1 µF
C. 100 nF
D. 10 nF
Rationale: “104” = 10 × 10⁴ pF = 100,000 pF = 0.1 µF.
4. The peak-to-peak voltage of a 10 Vrms sine wave is approximately:
A. 14.1 V
B. 28.3 V
, C. 20 V
D. 10 V
Rationale: Vpp = 2 × √2 × Vrms ≈ 2.828 × 10 = 28.3 V.
5. A transformer with a 5:1 turns ratio and 120 V primary will output:
A. 24 V
B. 24 V
C. 12 V
D. 600 V
Rationale: Secondary = Primary / ratio = = 24 V.
6. The impedance of a 1 µF capacitor at 1 kHz is about:
A. 160 Ω
B. 160 Ω
C. 1.6 kΩ
D. 16 Ω
Rationale: Xc = 1/(2πfC) = 1/(2π × 1 kHz × 1 µF) ≈ 159 Ω.
7. A diode in series with a load and 12 V supply drops 0.7 V. The load voltage is:
A. 12 V
B. 11.3 V
C. 0.7 V
D. 12.7 V
Rationale: 12 V – 0.7 V = 11.3 V.
8. The color code for a 4.7 kΩ ±5 % resistor is:
A. Yellow-Violet-Red-Gold
B. Yellow-Violet-Red-Gold
C. Yellow-Violet-Brown-Gold
D. Red-Violet-Red-Gold
Rationale: Yellow (4), Violet (7), Red (00), Gold (±5 %) = 4700 Ω.
9. A 2N3904 is a:
A. PNP power transistor
B. NPN small-signal transistor
C. MOSFET
D. SCR
Rationale: 2N3904 is an NPN general-purpose transistor.
10.The gain (dB) of an amplifier that doubles the input voltage is:
A. 3 dB
B. 6 dB
C. 10 dB
D. 20 dB
Rationale: Voltage gain in dB = 20 log₁₀(2) ≈ 6 dB.
11.A low-pass filter with R = 1 kΩ and C = 0.01 µF has a cut-off frequency of:
A. 15.9 kHz
B. 15.9 kHz
C. 1.59 kHz
D. 159 Hz
Rationale: fc = 1/(2πRC) ≈ 15.9 kHz.
