Page:Electronics Technician - Volume 7 - Antennas and Wave Propagation - NAVEDTRA 14092.pdf/108

 1-33. During the 27-day sunspotcycle, which ionospheric layer experiences the greatest fluctuations in density?
 * D
 * E
 * F1
 * F2

IN ANSWERING QUESTIONS 1-34 THROUGH 1-38, SELECT FROM THE FOLLOWING LIST THE DEFINITION OF THE INDICATED TERM.

1-34. D layer.


 * A
 * B
 * C
 * D

1-3. E layer
 * A
 * B
 * C
 * D

1-36. F layer
 * B
 * C
 * D
 * E

1-37. F1 layer
 * A
 * B
 * C
 * D

1-38. F2 layer
 * A
 * C
 * D
 * E

1-39. During periods of maximum sunspot activity within the eleven-year cycle, critical frequencies for all layers increase.
 * 1) True
 * 2) False

1-40. Which of the following problems is NOT a negative side effect of the sporadic E layer?
 * 1) Causes increased multipath problems
 * 2) Provides additional absorption
 * 3) Blanks out more favorable layers
 * 4) Increased static in line of sight communications

1-41. When sudden ionospheric disturbances (SID) occurs, which ionospheric layer is affected the most?
 * D
 * E
 * F1
 * F2

1-42. What effect do ionospheric storms have on (a) the range of frequencies and (b) the working frequency used for communications? 4
 * 1) (a) Increase (b) increase
 * 2) (a) Decrease (b) decrease
 * 3) (a) Increase (b) decrease
 * 4) (a) Decrease (b) increase