Page:Electronics Technician - Volume 7 - Antennas and Wave Propagation - NAVEDTRA 14092.pdf/110

 ASSIGNMENT 2

Textbook Assignment: "Antennas," chapter 2, pages 2-1 through 2-32.

2-1 Electromagnetic radiation from an antenna is made up of what two components?
 * 1) E and. H fields
 * 2) Ground and sky waves
 * 3) Vertical and horizontal wavefronts
 * 4) Reflected and refracted energy

2-2. What determines the size of a transmitting antenna?
 * 1) Transmitter power
 * 2) Available space
 * 3) Operating frequency
 * 4) Distance to be transmitted

2-3. Most practical transmitting antennas are divided into two classifications, Hertz and Marconi.
 * T
 * F

2-4. Hertz antennas are designed to operate at what wavelength in relationship to their operating frequency?
 * 1) Quarter-wave
 * 2) Half-wave
 * 3) Three quarter-wave
 * 4) Full-wave

2-5. Marconi antennas are used for operating frequencies below what level?
 * 1) 10 MHz
 * 2) 6 MHz
 * 3) 4 MHz
 * 4) 2 MHz

2-6. All antennas regardless of their shape or size have how many basic characteristics?
 * 1
 * 2
 * 3
 * 4

2-7 The ability to use the same antenna for both transmitting and receiving is known by what term?
 * 1) Gain
 * 2) Reciprocity
 * 3) Directivity
 * 4) Polarization

2-8. The ability of an antenna or or more specific array to focus energy in one directions is represented by a measurement of what antenna property?
 * 1) Signal Strength
 * 2) Reciprocity
 * 3) Directivity
 * 4) Polarization

2-9. The gain of a transmitting antenna is 9 dB, what will the gain be for the same antenna used for receiving?
 * 1) 9 dB
 * 2) 6 dB
 * 3) 4 dB
 * 4) 3 dB

2-10. Which, if any, of the following components of a radiated electromagnetic field determines its direction of polarization?
 * 1) H lines
 * 2) E lines
 * 3) Angle of Propagation
 * 4) None of the above

2-11. Over long distances the polarization of a radiated wave changes, at what frequencies will this change be the most dramatic? 6
 * VLF
 * LF
 * MF
 * HF