Question Bank

1. Weather radar is?

2. Sky waves are not likely to occur by day or night in whihc of the following frequency bands

3. What is skip distance?

4. In an amplitude modulated signal, the amplitude of the carrier wave will

5. What is the wavelength and waveband of a radio aid that uses a frequency of 19 cm

6. The rate of refraction of a radio wave which occurs within the ionosphere

7. What is the metric distance of an NDB wavelength?

8. What is the minimum level that an aircraft, at a range of 113 NM, must fly in order to contact the tower on R?T for a VDF bearing from an airport sited 169 FT above MSL?

9. For a given set of ionosphere conditions, as the frequency of an HF signal is increased

10. The wavelength of VHF radio signal is?

11. The rate of attenuation of a radio wave which occurs when the wave travels close to the Earths surface

12. The maximum theoretical range at which an aircraft at FL80 can obtain bearings from a ground VDF facility sited 325 FT above MSL is

13. A frequency of 295 KHz would be described as

14. What is the first returning sky wave called?

15. As a radio signal increases in frequency, ionospheric refraction ... and atmospheric attenuation

16. When is fading in the medium frequency band most likely to occur

17. Which radio frequency employs the refraction properties of the ionosphere?

18. The frequency which corresponds to a wavelength of 12 mm is

19. To establish and maintain effective HF communications the frequency used at a given range

20. In sky wave propagation the distance between the end of the surface wave and the first returning sky wave is called the

21. The frequency corresponding to a wavelength of 3.5 cm is

22. For a given HF frequency skip distance will normally

23. VOR wavelength is

24. VOR wavelenght is?

25. The wavelenght of I L S localizer is

26. Around a radiating transmitter aerial there is

27. Atmospheric ducting close to the earth, is most likely?

28. The wavelength of a 121.95 MHz signal is?