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.

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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.

1. T
2. 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. 1
2. 2
3. 3
4. 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?

1. VLF
2. LF
3. MF
4. HF

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