1. The bending of radio waves as they pass over a terrain feature such as hill or mountain diffraction refraction reflection optical illusion
2. The bending of radio waves as they pass obliquely from one medium to another in which the velocity of propagation is different diffraction refraction reflection diffusion
3. The lowest layer in the ionosphere used for HF propagation is, E layer D layer F2 layer F1 layer
4. The most dense of all the ionized layer of the ionosphere is, E D F1 F2
5. One way of minimizing fading is, use of diversity antenna use of two-transmitters use higher frequencies use lower frequencies 6. If the wavelength of a radio transmission is 20 meters, what is its operating frequency? 20 MHz 60 MHz 10 MHz 15 MHz
7. An antenna that uses the ground to complete its resonant circuit, hertz whip marconi faraday's antenna
8. The frequency range of UHF is, 3-30 MHz 30-300 MHz 300-3,000 MHz 3-30 GHz
9. One of this may cause ionic disturbance characterized by rapid fluttering sound, hence voice communications are poor magnetic storm highsolar flux index sunspot activities aurora borealis
10. The no signal area between the end of the mobile groundwave signal and the reflected skywave in HF propagation, tilt zone freznel zone skip zone MUF zone
11. The most usable layer for long distance communication in HF propagation using the ionosphere is, E F2 D F1
12. In propagating space wave, the most practical frequency band to use is, LF MF VHF HF
13. Ordinary broadcast quarter wavelength antenna uses this kind of wave propagation, space wave ground wave line of sight sky wave
14. What type of modulation is largely contained in static and lightning radio waves? AM FM PCM PM
15. The direction of the electrostatic field of an antenna, field characteristics polarization magnetization directivity
16. The velocity of radio waves, 300,000,000 meters per second 30,000,000,000 meters per second 3,000,000 meters per second 300,000,000,000 meters per second
17. Antennas having both horizontal and vertical components have this type of polarization, vertical horizontal circular diagonal polarizaton
18.The dielectric effect of the air at the end of the antenna that effectively lengthens the antenna, faraday effect end effect polarization effect magnetization effect
19. An antenna complete in itself and capable of self oscillation, hertz gauss marconi phonetic
20. What is the current of an antenna if the power is 2,000 watts and the antenna impedance is 20 ohms? 100 amperes 10 amperes 40 amperes 4 amperes 21. The lowest radio frequency used in radio communications is, 1 KHz 5 KHz 10 KHz 20 KHz 22.What is the relationship between the current and the radiated power of the antenna? P=IR P=IxIxR P=IxRxR P=IxIxE 23. What determines the surge impedance of two-wire non-resonant RF transmission line? impedance of the antenna series inductance shunt capacitance diameter of the wire 24. What kind of radio wave is the same day or night? space wave sky wave direct wave ground wave 25. The kind of antenna that needs no grounding hertz marconi AM broadcast gauss antenna
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