MOD 8.2 PART 2
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Questions and Answers

Which of the following is an example of parasite drag?

  • Induced drag
  • Profile drag (correct)
  • Induced drag
  • Wave drag
  • How does induced drag change with airspeed?

  • Induced drag increases linearly with airspeed
  • Induced drag decreases proportionally to the square of airspeed (correct)
  • Induced drag increases proportionally to the square of airspeed
  • Induced drag decreases linearly with airspeed
  • What causes induced drag?

  • Wing to body fairings
  • Spanwise movement of air from the bottom of the wing outward (correct)
  • Flow interference at the junction of various surfaces
  • Turbulence produced by skin friction
  • What is the purpose of winglets on modern aircraft?

    <p>To reduce induced drag</p> Signup and view all the answers

    What is the relationship between induced drag and airspeed?

    <p>Induced Drag decreases with the square of the airspeed</p> Signup and view all the answers

    Which forces act on an aircraft in flight?

    <p>Lift, weight, thrust, and drag</p> Signup and view all the answers

    What is the efficiency factor for total aircraft propulsion?

    <p>Thrust to weight ratio</p> Signup and view all the answers

    What is the equation for thrust to weight ratio?

    <p>$\frac{Thrust}{Weight} = \frac{ma}{mg}$</p> Signup and view all the answers

    Which of the following is true about the angle of attack (AoA)?

    <p>All of the above are true about the angle of attack (AoA).</p> Signup and view all the answers

    What is the purpose of changing the angle of attack (AoA) of the aerofoil?

    <p>To increase the camber of the upper surface in relation to the airflow.</p> Signup and view all the answers

    What happens to lift as the angle of attack (AoA) increases beyond the stalling angle?

    <p>Lift decreases rapidly.</p> Signup and view all the answers

    Which of the following is true about the stall condition in an aircraft?

    <p>The stall condition occurs when the dynamic pressure is constant.</p> Signup and view all the answers

    Where does the stall occur on the wing?

    <p>The stall occurs on the upper surface of the wing.</p> Signup and view all the answers

    What is the purpose of a stick shaker in heavy aircraft?

    <p>To simulate the effect of turbulent airflow over the elevators.</p> Signup and view all the answers

    What is the purpose of a stall strip on an aircraft wing?

    <p>To prevent flow separation at the wing tip.</p> Signup and view all the answers

    What happens to the aircraft during a wing root stall?

    <p>The aircraft rotates to the nose down position.</p> Signup and view all the answers

    Which of the following is a dimensionless coefficient that varies with surface finish, fineness ratios, etc.?

    <p>CD</p> Signup and view all the answers

    What is the portion of the resistance that is due to the formation of eddies and turbulence when air flows past an aircraft?

    <p>Form Drag</p> Signup and view all the answers

    What is the relationship between the length and thickness of a streamlined body for least resistance?

    <p>The length should be between three and four times greater than the maximum thickness</p> Signup and view all the answers

    Which of the following variables does the lift and drag forces depend on?

    <p>Air density</p> Signup and view all the answers

    What is the formula for lift force?

    <p>$L = \ 1/2 \cdot \rho \cdot v^2 \cdot S \cdot CL$</p> Signup and view all the answers

    What is the simplest and most basic formula for Drag Profile?

    <p>$Dp = \rho \cdot S $</p> Signup and view all the answers

    What happens to the lift produced by an aerofoil beyond 16° angle of attack?

    <p>The lift decreases</p> Signup and view all the answers

    What is the primary cause of the aerodynamic resultant and hence drag?

    <p>Change in dynamic pressure</p> Signup and view all the answers

    What causes the decrease in angle of attack (AoA) during a stall recovery?

    <p>Increased airspeed</p> Signup and view all the answers

    How is the wing twisted to cause 'Wash Out'?

    <p>Aerodynamically &amp; Geometrically</p> Signup and view all the answers

    Which of the following is the most severe and dangerous form of ice formation on an aircraft?

    <p>Glaze ice</p> Signup and view all the answers

    What is the main danger of glaze ice formation on an aircraft?

    <p>All of the above</p> Signup and view all the answers

    What is the effect of ice, snow, rime formation, or other deteriorations on the leading edge and upper surface of the wing?

    <p>All of the above</p> Signup and view all the answers

    Where is the first 20% of the wing chord particularly sensitive to disturbances of air flow?

    <p>Leading edge</p> Signup and view all the answers

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