Page:Electronics Technician - Volume 7 - Antennas and Wave Propagation - NAVEDTRA 14092.pdf/105

ASSIGNMENT 1

Textbook Assignment; "Wave Propagation," chapter 1, pages 1-1 through 1-14.

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1-1. Which of the following factors can affect atmospheric conditions?

1. Geographic height
2. Geographic location
3. Changes in time
4. All of the above

1-2. In what portion. of the atmosphere does the majority of weather phenomena take place?

1. Ionosphere
2. Stratosphere
3. Troposphere
4. Hydrosphere

1-3. Because the stratosphere is a relatively calm region with little or no temperature change, it will have almost no effect on radio wave propagation.

1. True
2. False

1-4. Variations in the ionosphere ionosphere can be separated into how many classes?

1. regular variations
2. irregular variations
3. both 1 and 2 above
4. seasons

1-5. The regular variations in the ionosphere can be seperated into how many classes?

1. One
2. Two
3. Three
4. Four

1-6. In ionization, when an electron is knocked free from a neutral gas atom, what is the overall charge of the atom?

1. Negative
2. Positive
3. Neutral
4. Inverted

1-7. The frequency of ultraviolet light passing through the atmosphere has what relationship to the ionospheric layer it ionizes?

1. It is inversely proportional
2. It is directly proportional
3. It is inversely proportional during the day and directly proportional at night
4. It is directly proportional during the day and inversely proportional at night

1-8. What term best describes the process that returns positive resulting from changes in the ions to their original neutral sun’s activity are known as state?

1. Refraction
2. Recombination
3. Ionization
4. Polarization

1-9. At what approximate time of day is the density of the ionospheric layers at its lowest level?

1. Just before sunrise
2. Mid-morning
3. Afternoon
4. Sunset

1-10 How many distinct layers make up the ionosphere?

1. One
2. Two
3. Three
4. Four

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