ASTM NCATT Radio Communication Systems (RCS)
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Recommendable For Grade A+
1. Which frequency band is primarily used for civil aircraft VHF voice
communications?
A. HF
B. VHF
C. UHF
D. SHF
Explanation: VHF (118.000–136.975 MHz) is the standard band for civil aviation
voice communication.
2. What is the primary purpose of a transceiver?
A. Generate electrical power
B. Transmit and receive radio signals
C. Measure altitude
D. Control autopilot
Explanation: A transceiver combines both transmitter and receiver functions.
3. What does RF stand for?
A. Relay Frequency
B. Radio Function
, C. Radio Frequency
D. Receiver Feedback
Explanation: Radio Frequency refers to electromagnetic frequencies used for
wireless communication.
4. Which modulation method is commonly used for aviation VHF voice
communication?
A. FM
B. PM
C. AM
D. PCM
Explanation: Amplitude Modulation (AM) allows multiple stations to be heard
simultaneously.
5. Which unit measures frequency?
A. Volt
B. Watt
C. Ampere
D. Hertz
Explanation: Hertz (Hz) represents one cycle per second.
6. What is one megahertz equal to?
A. 100 Hz
B. 1,000 Hz
C. 100,000 Hz
D. 1,000,000 Hz
Explanation: One MHz equals one million hertz.
7. A radio wave travels at approximately:
A. Speed of sound
B. 100,000 km/s
C. Speed of light
D. 500 km/s
, Explanation: Radio waves travel at the speed of light.
8. Which aircraft antenna is commonly used for VHF communications?
A. Loop antenna
B. Dish antenna
C. Blade antenna
D. Wire antenna
Explanation: Modern aircraft commonly use blade antennas for VHF
communications.
9. Which component generates the carrier frequency?
A. Filter
B. Amplifier
C. Detector
D. Oscillator
Explanation: An oscillator produces a stable carrier frequency.
10.Modulation is the process of:
A. Reducing power
B. Filtering noise
C. Adding information to a carrier wave
D. Grounding an antenna
Explanation: Modulation allows voice or data to ride on a carrier signal.
11.Which device converts sound into electrical signals?
A. Speaker
B. Oscillator
C. Microphone
D. Amplifier
Explanation: A microphone changes sound waves into electrical signals.
12.Which device converts electrical signals into sound?
A. Transmitter
B. Speaker
Endorsement Newest (2025 - 2026 Update) From
Real Past Papers Questions – A Set Of 100 Most
Common Exam Frequently Tested Questions And
Answers In Details 100% Verified Exam Highly
Recommendable For Grade A+
1. Which frequency band is primarily used for civil aircraft VHF voice
communications?
A. HF
B. VHF
C. UHF
D. SHF
Explanation: VHF (118.000–136.975 MHz) is the standard band for civil aviation
voice communication.
2. What is the primary purpose of a transceiver?
A. Generate electrical power
B. Transmit and receive radio signals
C. Measure altitude
D. Control autopilot
Explanation: A transceiver combines both transmitter and receiver functions.
3. What does RF stand for?
A. Relay Frequency
B. Radio Function
, C. Radio Frequency
D. Receiver Feedback
Explanation: Radio Frequency refers to electromagnetic frequencies used for
wireless communication.
4. Which modulation method is commonly used for aviation VHF voice
communication?
A. FM
B. PM
C. AM
D. PCM
Explanation: Amplitude Modulation (AM) allows multiple stations to be heard
simultaneously.
5. Which unit measures frequency?
A. Volt
B. Watt
C. Ampere
D. Hertz
Explanation: Hertz (Hz) represents one cycle per second.
6. What is one megahertz equal to?
A. 100 Hz
B. 1,000 Hz
C. 100,000 Hz
D. 1,000,000 Hz
Explanation: One MHz equals one million hertz.
7. A radio wave travels at approximately:
A. Speed of sound
B. 100,000 km/s
C. Speed of light
D. 500 km/s
, Explanation: Radio waves travel at the speed of light.
8. Which aircraft antenna is commonly used for VHF communications?
A. Loop antenna
B. Dish antenna
C. Blade antenna
D. Wire antenna
Explanation: Modern aircraft commonly use blade antennas for VHF
communications.
9. Which component generates the carrier frequency?
A. Filter
B. Amplifier
C. Detector
D. Oscillator
Explanation: An oscillator produces a stable carrier frequency.
10.Modulation is the process of:
A. Reducing power
B. Filtering noise
C. Adding information to a carrier wave
D. Grounding an antenna
Explanation: Modulation allows voice or data to ride on a carrier signal.
11.Which device converts sound into electrical signals?
A. Speaker
B. Oscillator
C. Microphone
D. Amplifier
Explanation: A microphone changes sound waves into electrical signals.
12.Which device converts electrical signals into sound?
A. Transmitter
B. Speaker
