Electricity, radio waves and propagation: DGCA Radio Telephony (R/T) questions

Question 1 of 5

• Correct answer, a: AM (amplitude modulation)
• bPPM (pulse position modulation)
• cPDM (pulse duration modulation)

Question 2 of 5

• aProgressive rise in carrier frequency
• Correct answer, b: Progressive loss of signal strength
• cProgressive shift in wave polarisation

Question 3 of 5

• Correct answer, a: DME, SSR, ADS-B (1090 MHz) and GPS
• bVOR, ILS localizer, marker beacons and NDB
• cWeather radar, radio altimeter, ELT and ADF

Question 4 of 5

• aIt boosts the range of VHF and UHF signals
• bIt slows and scatters SHF radar signals
• Correct answer, c: It absorbs LF, MF and the lower part of HF

Question 5 of 5

• aThe count of cycles passing a fixed point each second (the cycle rate)
• Correct answer, b: The distance between corresponding points on consecutive cycles (one cycle's length)
• cThe time the wave takes to complete one full cycle (one cycle's duration)