Which statement is correct in respect of CL and angle of attack?

Question

ATPL - Airline Transport Pilot license - Principles of Flight - Which statement is correct in respect of CL and angle of attack?

QuizVDS · Accepted Answer

For a symmetrical aerofoil, if the angle of attack is zero, CL is zero.

QuizVDS · Answer

For a symmetrical aerofoil, if the angle of attack is zero, CL is not zero.

QuizVDS · Answer

For an asymmetrical aerofoil, if the angle of attack is zero, CL is zero.

QuizVDS · Answer

For an asymmetrical aerofoil with positive camber, if the angle of attack is greater than zero, CL is zero.

ATPL: Which statement is correct in respect of CL and angle of attack?