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.

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?
 * One
 * Two
 * 1) Three
 * 2) 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
 * Two
 * 1) Three
 * 2) Four