Induced Drag Explained - Quiz

What is induced drag a consequence of?

• Producing lift

• Increasing speed

• Decreasing altitude

• Reducing weight

Answer explanation

Induced drag is a consequence of producing lift. As an aircraft generates lift, it creates a pressure difference above and below the wings, leading to vortex formation and resulting in induced drag.

What creates wingtip vortices?

• High-speed airflow over the wing

• Difference in pressure between the top and bottom of the wing

• The shape of the fuselage

• Low-speed airflow under the wing

Answer explanation

Wingtip vortices are created due to the difference in pressure between the top and bottom of the wing. This pressure difference causes air to flow around the wingtips, forming swirling vortices.

How does the angle of attack affect induced drag?

• Higher angles of attack increase induced drag

• Angle of attack has no effect on induced drag

• Higher angles of attack decrease induced drag

• Lower angles of attack increase induced drag

Answer explanation

Higher angles of attack increase induced drag because they enhance lift but also create more vortices, leading to greater drag. This relationship is crucial for understanding aircraft performance.

What happens to induced drag as speed increases?

• Induced drag fluctuates

• Induced drag increases

• Induced drag decreases

• Induced drag remains constant

Answer explanation

Induced drag decreases as speed increases due to the reduction in the angle of attack required to maintain lift. At higher speeds, the lift-to-drag ratio improves, leading to lower induced drag.

What is the relationship between parasite drag and speed?

• Parasite drag remains constant with speed

• Parasite drag is unaffected by speed

• Parasite drag decreases with speed

• Parasite drag increases with speed

Answer explanation

Parasite drag increases with speed due to the greater air resistance encountered by an object moving faster through a fluid. This relationship is crucial in aerodynamics, making the correct choice 'Parasite drag increases with speed'.

What is wake turbulence primarily caused by?

• Wingtip vortices

• Engine exhaust

• Flap extension

• Landing gear deployment

Answer explanation

Wake turbulence is primarily caused by wingtip vortices, which are circular patterns of rotating air left behind by an aircraft's wings. These vortices can create hazardous conditions for following aircraft.

What effect does ground effect have on induced drag?

• Reduces induced drag

• Increases induced drag

• Has no effect on induced drag

• Fluctuates induced drag

Answer explanation

Ground effect reduces induced drag by altering the airflow around the wings when an aircraft is close to the ground. This effect increases lift and decreases the vortex strength, leading to lower induced drag.

What is the purpose of winglets?

• To reduce wingtip vortices

• To enhance landing gear performance

• To increase engine efficiency

• To improve passenger comfort

Answer explanation

Winglets are designed to reduce wingtip vortices, which are the swirling air currents that form at the tips of wings. By minimizing these vortices, winglets improve aerodynamic efficiency and reduce drag, enhancing overall flight performance.

How does a high aspect ratio affect induced drag?

• Fluctuates induced drag

• Has no effect on induced drag

• Increases induced drag

• Reduces induced drag

Answer explanation

A high aspect ratio wing has a longer span relative to its chord, which reduces the strength of the vortices at the wingtips. This leads to lower induced drag, making the correct answer 'Reduces induced drag'.

What is 'washout' in aircraft design?

• A twist in the wing to reduce induced drag

• A method to clean the aircraft

• A landing gear configuration

• A type of engine cooling system

Answer explanation

'Washout' refers to a twist in the wing design that helps reduce induced drag by ensuring that the wing's angle of attack decreases towards the tip, improving aerodynamic efficiency.