Radio Waves, Propagation & Equipment: DGCA Radio Telephony (RTR) questions
17 practice questions and 7 flashcards on Radio Waves, Propagation & Equipment for the DGCA Radio Telephony (RTR) exam, with 1 linked simulator. Try the samples below, then practise the whole topic.
Key concepts
Wavelength and frequency.
Wavelength is the speed of light divided by frequency.
- 120 MHz gives 2.5 m
- Higher frequency means shorter wavelength
VHF line-of-sight range.
About 1.23 times the square root of each height in feet, in nautical miles.
- 9 000 ft to a ground station: about 117 NM
- More power does not extend the range
Sample questions
Q1Radio waves travel at approximately:
- 3 000 km per second
- 30 000 km per second
- 340 m per second
- 300 000 km per second
Show the answer
Answer: D. 300 000 km per second The speed of light, c ≈ 3 × 10⁸ m/s.
Q2The wavelength of a 120 MHz signal is approximately:
- 25 m
- 0.25 m
- 2.5 m
- 250 m
Show the answer
Answer: C. 2.5 m λ = 300 ÷ f(MHz) = 300 ÷ 120 = 2.5 m.
Q3The usual unit used for frequencies is:
- Decibel (dB)
- Nautical mile (NM)
- Watt (W)
- Hertz (Hz), with kHz and MHz for thousands and millions
Show the answer
Answer: D. Hertz (Hz), with kHz and MHz for thousands and millions Frequency is the number of cycles per second, measured in hertz.
Q4The line-of-sight range of an aircraft at 9 000 ft to a ground station at sea level is about:
- 117 NM
- 9 NM
- 300 NM
- 37 NM
Show the answer
Answer: A. 117 NM 1.23 × √9 000 ≈ 1.23 × 94.9 ≈ 117 NM.
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More Radio Telephony (RTR) topics
Practice questions for study. They are not real DGCA exam papers. Check the current DGCA syllabus and notices.