1. The bending of radio waves as they pass over the upper edge of a hill or mountain is known as, refraction knife edge diffraction troposcatter re-radiation
2. For line of sight propagation, which frequency band is more adaptable? LF MF HF VHF
3. What type of modulation is largely contained in static and lightning radio waves? AM FM PCM PM
4. Mobile antennas are of two types; quarter wave ground plane and half-wave type. They are both parabolic parasitic coaxial vertical-collinear antennas
5. What is the unit of field intensity? ohms/meter amperes/meter watts/meter volts/meter 6. The ratio of the voltage and current infinite line or a line terminated in its own characteristic impedance impedance watch resistance line characteristic impedance output impedance
7. Circuit or device that permits transmit and receive operation using one antenna is diplexer duplexer diversity antenna space antenna
8. A circuit or device that permits two different transmitters to operate with a single antenna, diplexer duplexer diversity antenna space antenna
9. On what TV channel do the 2nd harmonic of a 27 MHz transmitter fall? Channel 2 Channel 3 Channel 4 Channel 5
10. A plot of the relative strength or intensity of the antenna radiation as a function of the orientation in a given plane is called I vs V graph characteristic curve radiation pattern R vs V graph
11.What is the unit of magnetic field intensity? amperes per meter volts per meter amperes per ohm volts per ohm
12. What is the parameter that compares the concentration of power in the given antenna to that of some reference antenna? amplification of the antenna radiation strength of the antenna propagation of the antenna gain of the antenna
13. The characteristic of an antenna referring to its capability of beaming, the energy in narrow range of directions is, selectivity directivity sensitivity accuracy
14. When the electric field lines in a plane parallel to the earth's surface; the polarization is said to be, vertical horizontal circular perpindicular
15. What is the resistance of free space? 177 ohms 377 ohms 277 ohms 477 ohms
16. The gain in the direction of one of the major lobes of the radiation pattern is known as, minimum gain power gain directivity directive gain
17. Antenna gains are measured with reference to parabolic radiator dipole radiator directive radiator isotropic radiator
18. A device used to connect antenna to the output tank circuit of a transmitter in order to prevent the DC supply from reaching the antenna impedance network antenna coupler inductor oscillator
19. Transmission lines normally used for frequencies above 186 Hz waveguides heliax cable coaxial cable parallel wire line
20. When the electric field lines in a plane is perpindicular to the earth's surface. the polarization is said to be, vertical horizontal circular perpindicular 21. What is the wavelength of tje frequency used is 300 MHz, 30 meters 3 meters 1 meter 15 meters 22. What is the quarter-wave length of 150 MHz? 2 meters 1 meter 0.5 meter 5 meter 23. What is the approximate height of the geostationary satellite from the earth's surface? 360,000 kms 360,000 miles 36,000 meters 36,000 kms 24. What is the other name of directing in propagation of radio waves? bending tilting super diffraction super refraction 25. What is the speed of electromagnetic waves in free space? 3,000,000 meters/sec 300,000,000 meters/sec 300,000 meters/sec 3,000,000,000 meters/sec
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