South Carolina Aircraft Avionics
Technician Certification License Exam
Practice Questions And Correct Answers
(Verified Answers) Plus Rationale 2026
Q&A| Instant Download Pdf
1. What is the primary purpose of an aircraft’s avionics system?
A. To provide structural support
B. To manage electronic communication, navigation, and
instrumentation
C. To supply fuel to engines
D. To regulate cabin pressure
The primary purpose of avionics is to manage the aircraft’s electronic
systems, including communication, navigation, and instrument
displays.
2. Which frequency band is typically used for civil aviation
communications?
A. LF (Low Frequency)
B. HF (High Frequency)
C. VHF (Very High Frequency)
D. UHF (Ultra High Frequency)
Civil aviation voice communication uses the VHF band due to its
line-of-sight reliability and reduced interference.
,3. What device in the avionics suite provides the pilot with the aircraft’s
attitude relative to the horizon?
A. GPS
B. Altimeter
C. Attitude Indicator
D. Airspeed Indicator
The attitude indicator displays the aircraft's orientation relative to
the horizon, critical for instrument flight.
4. What is the primary function of an aircraft transponder?
A. Measure fuel flow
B. Control wing flaps
C. Respond to radar interrogation with aircraft identification and
altitude
D. Monitor cabin temperature
A transponder replies to radar signals with data to help ATC identify
and track the aircraft.
5. What type of signal does a VOR (VHF Omnidirectional Range) ground
station emit?
A. AM broadcast
B. GPS correction signal
C. Two VHF signals for azimuth determination
D. HF long-range signal
VOR uses two signals—reference and variable phase—to allow
receivers to determine bearing to the station.
6. Which instrument uses a sealed aneroid capsule to measure
atmospheric pressure changes?
A. Tachometer
B. Compass
C. Altimeter
, D. Gyroscope
An altimeter measures barometric pressure using an aneroid capsule
to determine altitude.
7. What is the purpose of a static port on an aircraft?
A. To drain fuel
B. To measure engine pressure
C. To provide static electricity grounding
D. To sense ambient static air pressure
Static ports provide the ambient pressure input for instruments like
the altimeter and airspeed indicator.
8. In an aircraft communication system, what does AM stand for?
A. Analog Modulation
B. Amplitude Modulation
C. Automatic Modulation
D. Altitude Monitor
AM is Amplitude Modulation, a method of encoding information by
varying signal amplitude.
9. What component converts alternating current (AC) to direct current
(DC) in avionics systems?
A. Inverter
B. Transformer
C. Rectifier
D. Alternator
A rectifier converts AC to DC for use in avionics that require direct
current.
10. What is the purpose of IFF (Identification Friend or Foe) in
military avionics?
A. To improve navigation accuracy
B. To broadcast weather data
Technician Certification License Exam
Practice Questions And Correct Answers
(Verified Answers) Plus Rationale 2026
Q&A| Instant Download Pdf
1. What is the primary purpose of an aircraft’s avionics system?
A. To provide structural support
B. To manage electronic communication, navigation, and
instrumentation
C. To supply fuel to engines
D. To regulate cabin pressure
The primary purpose of avionics is to manage the aircraft’s electronic
systems, including communication, navigation, and instrument
displays.
2. Which frequency band is typically used for civil aviation
communications?
A. LF (Low Frequency)
B. HF (High Frequency)
C. VHF (Very High Frequency)
D. UHF (Ultra High Frequency)
Civil aviation voice communication uses the VHF band due to its
line-of-sight reliability and reduced interference.
,3. What device in the avionics suite provides the pilot with the aircraft’s
attitude relative to the horizon?
A. GPS
B. Altimeter
C. Attitude Indicator
D. Airspeed Indicator
The attitude indicator displays the aircraft's orientation relative to
the horizon, critical for instrument flight.
4. What is the primary function of an aircraft transponder?
A. Measure fuel flow
B. Control wing flaps
C. Respond to radar interrogation with aircraft identification and
altitude
D. Monitor cabin temperature
A transponder replies to radar signals with data to help ATC identify
and track the aircraft.
5. What type of signal does a VOR (VHF Omnidirectional Range) ground
station emit?
A. AM broadcast
B. GPS correction signal
C. Two VHF signals for azimuth determination
D. HF long-range signal
VOR uses two signals—reference and variable phase—to allow
receivers to determine bearing to the station.
6. Which instrument uses a sealed aneroid capsule to measure
atmospheric pressure changes?
A. Tachometer
B. Compass
C. Altimeter
, D. Gyroscope
An altimeter measures barometric pressure using an aneroid capsule
to determine altitude.
7. What is the purpose of a static port on an aircraft?
A. To drain fuel
B. To measure engine pressure
C. To provide static electricity grounding
D. To sense ambient static air pressure
Static ports provide the ambient pressure input for instruments like
the altimeter and airspeed indicator.
8. In an aircraft communication system, what does AM stand for?
A. Analog Modulation
B. Amplitude Modulation
C. Automatic Modulation
D. Altitude Monitor
AM is Amplitude Modulation, a method of encoding information by
varying signal amplitude.
9. What component converts alternating current (AC) to direct current
(DC) in avionics systems?
A. Inverter
B. Transformer
C. Rectifier
D. Alternator
A rectifier converts AC to DC for use in avionics that require direct
current.
10. What is the purpose of IFF (Identification Friend or Foe) in
military avionics?
A. To improve navigation accuracy
B. To broadcast weather data
