AERODYNAMICS

1. Aspect ratio of a wing is defined as the ratio between the

• wingspan and the mean cord.

• square of the cord to the wingspan.

• wingspan to the wing root.

A wing with a very high aspect ratio (such as a glider) will have

• Increased drag

• Low stall speed

• Poor control qualities

The desired effect of using winglets on aircraft wing tips is to

• Optimize dihedral

• Reduce aspect ratio

• Increase the lift to drag ratio

The purpose of aircraft wing dihedral is to

• Increase lateral stability

• Increase longitudinal stability

• Increase lift coefficient

Which two laws of physics explain the force of LIFT as an airfoil/wing moves through the air?

• Newton’s Third Law of Motion and Bernoulli’s Principle

• Pascal’s Law and Pythagorean Theorem

• The Theory of Relativity and Boyle’s Law

An airplane wing is designed to produce lift resulting from

• positive air pressure below and above the wing’s surface.

• positive air pressure below the wing’s surface and negative air pressure above the wing’s surface

• negative air pressure below the wing’s surface and positive air pressure above the wing’s surface along with the downward deflection of air.

Which angle is determined by the aircraft design and the location of the wing?

• Angel of attack

• Angle of Axis

• Angel of incidence

How is lift generated in a helicopter?

• The angle of attack and the relative wind.

• The Coriolis effect.

• A pressure differential created by rotation of the main rotor blades.

Which of the following statements are correct regarding a helicopter flight controls?

• When the cyclic control stick is raised, the blade angle of all the rotor blades increase uniformly.

• When the collective control lever is raised, the blade angle of all the rotor blades increases uniformly.

• When the collective control lever is raised, the blade angle of the tail rotors blades are increased uniformly.

All helicopters can make a controlled landing in the event of engine failure. This maneuver is known as

• Freewheeling flight

• Vertical flight

• Autorotation