Module 3_4 Quiz

1. If you were a pilot trying to approach a target as closely as possible without being detected by a ground-based radar, what elevation would be the best to fly at during standard atmospheric conditions?

a) As low as possible
b) About 100 meters above the surface
c) About 500 meters above the surface
d)About 1000 meters above the surface
e) It doesn't matter; detection is just as likely at all elevations.

2. If you were a pilot trying to approach a target as closely as possible without being detected by a ground-based radar, what elevation would be the best to fly at during surface-based ducting atmospheric conditions? Assume the duct extends from the surface to an elevation of 480 meters.

a) As low as possible.
b) 100 meters above the surface.
c) About 500 meters above the surface.
d) About 1000 meters above the surface.
e) It doesn't matter; detection is just as likely at all elevations.

3. What causes interference patterns and the resulting decreases and increases in signal strength with range above the surface for a transmitter located near an ocean surface?

a) Turbulence in the Atmospheric Boundary Layer.
b) Changes in the M profile with range
c) Reflection of rays off the surface interacting with direct path rays.
d) All of the above could cause interference patterns.

4. Which of the following happens during subrefractive conditions?

a) EM rays bend upward.
b) N increases with elevation.
c) There may be a strong increase in humidity with elevation.
d) Radar detection ranges are decreased.
e) All of the above are correct.

5. Which of the following differential horizontal advection scenarios is most likely to create subrefractive conditions?

a) Warm air is advected (horizontally transported into region) above a region of cold air advection.
b) Dry air is advected above a region of moist air advection.
c)Cool moist air is advected above a region of warm dry air advection.
d) All of the above could create subrefractive conditions.
None of the above are likely to create subrefractive conditions.

6. Which of the following situations is most likely to create subrefractive conditions near the surface?

a) Humidity flux toward the surface (such as over a dry desert).
b) Humidity flux away from the surface (such as over water).
c) Heat flux toward the surface (such as over a cold area).
d) B and C could both produce subrefractive conditions.
e) None of the above is likely to cause subrefractive conditions.

7. Sometimes saturated air (fog) near the surface is associated with subrefractive conditions. Besides saturated air, what else needs to exist to create subrefractive conditions in this situation?

a) Decrease in temperature with elevation.
b) Increase in temperature with elevation.
c) Decrease in humidity with elevation.
d) Increase in wind speed with elevation.
e) None of the above.