ASTM NCATT Communication Equipment
Assessment Newest (2025 - 2026 Update)
From Real Past Papers Questions – A Set Of
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Questions And Answers In Details 100%
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Grade A+
1. What is the primary purpose of an aircraft communication system?
A. Navigation
B. Weather detection
C. Answer: C. Voice and data communication
D. Engine control
Explanation: Aircraft communication equipment is designed to enable reliable
voice and data exchange between the aircraft and ground stations or other
aircraft.
2. Which frequency band is primarily used for civil aviation VHF voice
communications?
A. HF
B. UHF
C. Answer: C. VHF (118.000–136.975 MHz)
D. SHF
Explanation: Civil aircraft normally use the VHF aviation band for line-of-sight
voice communications.
3. Why are VHF communications generally limited in range?
,A. Low transmitter power
B. Atmospheric absorption
C. Answer: C. Line-of-sight propagation
D. Frequency instability
Explanation: VHF signals travel primarily in straight lines and are limited by the
radio horizon.
4. HF communication is mainly used for:
A. Taxi operations
B. Ground maintenance
C. Answer: C. Long-range oceanic communication
D. Weather radar
Explanation: HF radio can travel beyond the horizon through ionospheric
reflection.
5. Which modulation method is commonly used for aviation VHF voice
communication?
A. FM
B. PM
C. Answer: C. AM
D. QAM
Explanation: Amplitude Modulation allows multiple transmissions to be heard
simultaneously, reducing the chance of blocked transmissions.
6. SELCAL stands for:
A. Selective Calibration
B. Signal Electronic Call
C. Answer: C. Selective Calling
D. Signal Control Link
Explanation: SELCAL alerts the flight crew when a ground station wants to
establish communication.
, 7. What is the advantage of SELCAL?
A. Improves navigation accuracy
B. Increases transmitter power
C. Answer: C. Eliminates continuous radio monitoring
D. Prevents antenna icing
Explanation: SELCAL allows pilots to avoid constantly listening to HF frequencies.
8. Which communication equipment typically interfaces with cockpit audio
panels?
A. ELT
B. DME
C. Answer: C. VHF transceiver
D. Weather radar
Explanation: Audio panels allow pilots to select and monitor communication
radios.
9. Aircraft microphones usually produce:
A. Hydraulic pressure
B. Optical signals
C. Answer: C. Electrical audio signals
D. RF carrier waves
Explanation: Microphones convert sound into electrical signals.
10.Push-to-Talk (PTT) switches are used to:
A. Tune frequencies
B. Adjust volume
C. Answer: C. Key the transmitter
D. Test antennas
Explanation: Pressing the PTT activates the transmitter while disabling reception.
11.What component prevents simultaneous transmitting and receiving on a
simplex radio?
Assessment 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. What is the primary purpose of an aircraft communication system?
A. Navigation
B. Weather detection
C. Answer: C. Voice and data communication
D. Engine control
Explanation: Aircraft communication equipment is designed to enable reliable
voice and data exchange between the aircraft and ground stations or other
aircraft.
2. Which frequency band is primarily used for civil aviation VHF voice
communications?
A. HF
B. UHF
C. Answer: C. VHF (118.000–136.975 MHz)
D. SHF
Explanation: Civil aircraft normally use the VHF aviation band for line-of-sight
voice communications.
3. Why are VHF communications generally limited in range?
,A. Low transmitter power
B. Atmospheric absorption
C. Answer: C. Line-of-sight propagation
D. Frequency instability
Explanation: VHF signals travel primarily in straight lines and are limited by the
radio horizon.
4. HF communication is mainly used for:
A. Taxi operations
B. Ground maintenance
C. Answer: C. Long-range oceanic communication
D. Weather radar
Explanation: HF radio can travel beyond the horizon through ionospheric
reflection.
5. Which modulation method is commonly used for aviation VHF voice
communication?
A. FM
B. PM
C. Answer: C. AM
D. QAM
Explanation: Amplitude Modulation allows multiple transmissions to be heard
simultaneously, reducing the chance of blocked transmissions.
6. SELCAL stands for:
A. Selective Calibration
B. Signal Electronic Call
C. Answer: C. Selective Calling
D. Signal Control Link
Explanation: SELCAL alerts the flight crew when a ground station wants to
establish communication.
, 7. What is the advantage of SELCAL?
A. Improves navigation accuracy
B. Increases transmitter power
C. Answer: C. Eliminates continuous radio monitoring
D. Prevents antenna icing
Explanation: SELCAL allows pilots to avoid constantly listening to HF frequencies.
8. Which communication equipment typically interfaces with cockpit audio
panels?
A. ELT
B. DME
C. Answer: C. VHF transceiver
D. Weather radar
Explanation: Audio panels allow pilots to select and monitor communication
radios.
9. Aircraft microphones usually produce:
A. Hydraulic pressure
B. Optical signals
C. Answer: C. Electrical audio signals
D. RF carrier waves
Explanation: Microphones convert sound into electrical signals.
10.Push-to-Talk (PTT) switches are used to:
A. Tune frequencies
B. Adjust volume
C. Answer: C. Key the transmitter
D. Test antennas
Explanation: Pressing the PTT activates the transmitter while disabling reception.
11.What component prevents simultaneous transmitting and receiving on a
simplex radio?
