Analog Flight Instruments Quiz
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Questions and Answers

What is the difference in skin friction between turbulent and laminar boundary layer flow?

  • Laminar skin friction is about one-third that for turbulent flow (correct)
  • Turbulent skin friction is twice that for laminar flow
  • Turbulent skin friction is about one-third that for laminar flow
  • Laminar skin friction is twice that for turbulent flow

    • What is a characteristic of the turbulent boundary layer's velocity profile?

  • It has a lower local velocities immediately adjacent to the surface
  • It has a less rapid change of velocity with distance above the surface
  • It has a lower kinetic energy in the airflow next to the surface
  • It has a fuller velocity profile and higher local velocities adjacent to the surface (correct)

    • What is the relationship between shearing stress and velocity gradient in the laminar boundary layer?

  • The lower velocity gradient of the laminar boundary layer corresponds to higher shearing stress
  • The higher velocity gradient of the laminar boundary layer corresponds to lower shearing stress
  • The higher velocity gradient of the laminar boundary layer corresponds to higher shearing stress
  • The lower velocity gradient of the laminar boundary layer corresponds to lower shearing stress (correct)

    • What is the nature of the transition to turbulent boundary layer flow?

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