17 / 20
In case that obstacles on the surface, like trees and houses, are the only cause of turbulence, such turbulence will be greatest at around:
  • A
    2 000 m above ground
  • B
    500 m above ground
  • C
    150 m above ground
  • D
    1 000 m above ground

Refer to figure.

MECHANICAL TURBULENCE (Frictional turbulence) - is caused by physical obstructions to the normal flow of air caused by the friction between the air and the ground, especially irregular terrain (such as hills, mountains, coasts, trees) and man-made obstacles. It occurs within the friction layer (2000-3000ft).

  • This sort of turbulence extends up to 2 times the height of obstacles. Trees and houses are relatively low obstacles => Therefore, the closest answer is 150m.

Your Notes (not visible to others)



This question has appeared on the real examination, you can find the related countries below.

  • Greece
    1
Keyboard Shortcut Use Keyboard Shortcuts