NCATT AET Certification Exam 2025/2026 |
Aviation Electronics Technician | Questions &
Correct Answers | Verified Competency
Format
What is the unit of electrical resistance?
✅
A. Volt
B. Ohm
C. Ampere
D. Watt
Answer: B – Ohm is the unit of resistance.
1. Which device converts electrical energy into mechanical motion?
✅
A. Transformer
B. Motor
C. Rectifier
D. Resistor
Answer: B – Motors convert electrical energy into mechanical motion.
2. In a series circuit, the current is:
✅
A. Different in each component
B. The same through all components
C. Zero
D. Only through the first resistor
Answer: B – Current is the same throughout a series circuit.
,3. If a 12V battery is connected across a 6Ω resistor, what is the current?
✅
A. 0.5 A
B. 2 A
C. 6 A
D. 72 A
Answer: B – Using Ohm’s law: I = V/R = 12/6 = 2 A.
4. What is the purpose of a diode in an electrical circuit?
✅
A. Amplify voltage
B. Allow current in one direction only
C. Store energy
D. Reduce resistance
Answer: B – Diodes are unidirectional devices.
5. Which type of current flows in only one direction?
✅
A. AC
B. DC
C. RF
D. Pulsed AC
Answer: B – Direct current flows in one direction.
6. Which instrument measures voltage?
✅
A. Ammeter
B. Voltmeter
C. Ohmmeter
D. Oscilloscope
Answer: B – Voltmeters measure voltage across components.
7. A capacitor stores:
A. Current
✅
B. Voltage
C. Energy in an electric field
D. Resistance
Answer: C – Capacitors store energy in the electric field between plates.
8. What is the phase difference between current and voltage in a purely resistive AC
✅
circuit?
A. 0°
B. 45°
C. 90°
D. 180°
Answer: A – In resistive circuits, voltage and current are in phase.
, ✅
9. Ohm’s Law formula:
A. V = I × R
B. I = R × V
C. R = V × I
D. V = I ÷ R
Answer: A – Voltage equals current times resistance.
10.What is the main function of a transformer?
✅
A. Convert AC to DC
B. Step up or step down AC voltage
C. Store energy
D. Limit current
Answer: B – Transformers change AC voltage levels.
11.Which of the following is a semiconductor device?
✅
A. Resistor
B. Diode
C. Inductor
D. Capacitor
Answer: B – Diodes and transistors are semiconductors.
12.What is the primary purpose of a fuse?
✅
A. Increase voltage
B. Prevent circuit overload
C. Measure current
D. Store energy
Answer: B – Fuses protect circuits from excessive current.
✅
13.Which color code represents a 470Ω resistor?
A. Yellow – Violet – Brown
B. Red – Red – Brown
C. Green – Blue – Red
D. Brown – Black – Red
Answer: A – Yellow (4), Violet (7), Brown (×10).
14.The frequency of standard AC in the US is:
✅
A. 50 Hz
B. 60 Hz
C. 400 Hz
D. 100 Hz
Answer: B – Standard AC mains in the US is 60 Hz.
15.A short circuit results in:
A. Reduced voltage
Aviation Electronics Technician | Questions &
Correct Answers | Verified Competency
Format
What is the unit of electrical resistance?
✅
A. Volt
B. Ohm
C. Ampere
D. Watt
Answer: B – Ohm is the unit of resistance.
1. Which device converts electrical energy into mechanical motion?
✅
A. Transformer
B. Motor
C. Rectifier
D. Resistor
Answer: B – Motors convert electrical energy into mechanical motion.
2. In a series circuit, the current is:
✅
A. Different in each component
B. The same through all components
C. Zero
D. Only through the first resistor
Answer: B – Current is the same throughout a series circuit.
,3. If a 12V battery is connected across a 6Ω resistor, what is the current?
✅
A. 0.5 A
B. 2 A
C. 6 A
D. 72 A
Answer: B – Using Ohm’s law: I = V/R = 12/6 = 2 A.
4. What is the purpose of a diode in an electrical circuit?
✅
A. Amplify voltage
B. Allow current in one direction only
C. Store energy
D. Reduce resistance
Answer: B – Diodes are unidirectional devices.
5. Which type of current flows in only one direction?
✅
A. AC
B. DC
C. RF
D. Pulsed AC
Answer: B – Direct current flows in one direction.
6. Which instrument measures voltage?
✅
A. Ammeter
B. Voltmeter
C. Ohmmeter
D. Oscilloscope
Answer: B – Voltmeters measure voltage across components.
7. A capacitor stores:
A. Current
✅
B. Voltage
C. Energy in an electric field
D. Resistance
Answer: C – Capacitors store energy in the electric field between plates.
8. What is the phase difference between current and voltage in a purely resistive AC
✅
circuit?
A. 0°
B. 45°
C. 90°
D. 180°
Answer: A – In resistive circuits, voltage and current are in phase.
, ✅
9. Ohm’s Law formula:
A. V = I × R
B. I = R × V
C. R = V × I
D. V = I ÷ R
Answer: A – Voltage equals current times resistance.
10.What is the main function of a transformer?
✅
A. Convert AC to DC
B. Step up or step down AC voltage
C. Store energy
D. Limit current
Answer: B – Transformers change AC voltage levels.
11.Which of the following is a semiconductor device?
✅
A. Resistor
B. Diode
C. Inductor
D. Capacitor
Answer: B – Diodes and transistors are semiconductors.
12.What is the primary purpose of a fuse?
✅
A. Increase voltage
B. Prevent circuit overload
C. Measure current
D. Store energy
Answer: B – Fuses protect circuits from excessive current.
✅
13.Which color code represents a 470Ω resistor?
A. Yellow – Violet – Brown
B. Red – Red – Brown
C. Green – Blue – Red
D. Brown – Black – Red
Answer: A – Yellow (4), Violet (7), Brown (×10).
14.The frequency of standard AC in the US is:
✅
A. 50 Hz
B. 60 Hz
C. 400 Hz
D. 100 Hz
Answer: B – Standard AC mains in the US is 60 Hz.
15.A short circuit results in:
A. Reduced voltage
