DGCA CPL Technical General Practice Questions - DGCA Commercial Pilot License (CPL) Technical General Exam

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If the angle of attack of an airfoil is increased while maintaining constant airspeed, what happens to the lift and drag coefficients ($C_L$ and $C_D$)?

Both lift and drag coefficients increase until the critical angle of attack is reached, after which the lift coefficient drops sharply while drag continues to increase. Lift coefficient increases and drag coefficient decreases because the airfoil becomes more efficient. Lift coefficient decreases and drag coefficient increases due to turbulent airflow. Both coefficients remain constant since the airspeed is unchanged.

Correct Answer:

Both lift and drag coefficients increase until the critical angle of attack is reached, after which the lift coefficient drops sharply while drag continues to increase.

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