Chord line and mean camber line are in line (identical) on the airfoil have:....

• zero lift for positive angle of attack

• zero lift for negative angle of attack

• zero lift at zero angle of attack

• a), b), and c) are not correct

Aerodynamic force that can act along the chord line is...

• center of pressure

• 25%Mac + moment

• perpendicular to flight path

• all answers are correct

Number 3 on the drawing shows

• the chord line

• the maximum camber

• the thickness

• the mean camber line

Number 4 on the drawing shows

• the chord line

• the maximum camber

• the thickness

• the mean camber line

Number 5 on the drawing shows

• the upper-surface curvature

• the maximum camber

• the maximum thickness

• the mean camber line

Which of the following will develop positive lift?

• A symmetrical airfoil at zero Angle of Attack

• A nonrotating cylinder in a wind tunnel

• A cambered airfoil at zero AOA

• A cambered airfoil at high AOA

Which of the following will not produce a pitching moment?

• A symmetrical airfoil at a positive Angle of Attack (AOA)

• A cambered airfoil that is developing zero lift

• A cambered airfoil that is at a positive AOA

• A symmetrical airfoil at zero AOA

Which is the following answer is right? For a cambered airfoil, the center of pressure (CP)...

• moves to the rear of the wing at low Angle of Attack (AOA)

• moves backward as AOA increases

• moves forward as AOA increases

• Both (a) and (c)

Which is the following statement is wrong false about Aerodynamic Center for the cambered airfoil?

• the Aerodynamic Center is where all changes in lift effectively take place

• there is no pitching moment at the Aerodynamic Centre

• the Aerodynamic Centre is located near 25% C subsonically.

• the pitching moment at the Aerodynamic Centre is constant with change of AOA (at constant airspeed).

Which is the following answer is right? For a symmetrical airfoil, the center of pressure...

• moves forward as Angle of Attack increases

• stays at the same place as AOA increases

• there is no pitching moment

• Both (b) and (c)