Chapter 7: Basic Aeronautics And Aerodynamics

Question 1

The science and art of flight through the atmosphere

Answer 1

Aeronautics

Question 2

The science relating to the energy of gases in motion

Answer 2

Aerodynamics

Question 3

What decreases with an increase in altitude?

Answer 3

Pressure

Question 4

Measure of how much energy the gas has

Answer 4

Temperature

Question 5

The measure of how many molecules are squeezed into a defined space

Answer 5

Density

Question 6

Resistance to the flow of a liquid or gas

Answer 6

Viscosity

Question 7

The smooth or rough flow of air over an object

Answer 7

Laminar or turbulent flow

Question 8

The ratio of the speed of an object to the speed of sound in air

Answer 8

Mach number

Question 9

The part of the airfoil that meets the air first

Answer 9

The leading edge

Question 10

The area determining the airfoil thickness and thus its lift

Answer 10

Camber (curvature)

Question 11

The rear junction where the upper and lower parts of the airfoil meet

Answer 11

Trailing edge

Question 12

The imaginary part of the airfoil that is the starting point for designing an airfoil in cross-section

Answer 12

Chord (chord line)

Question 13

Ideally, when a plane is in smooth flight, the force of the total lift = the force of the total ___ and the force of ___ equals the force of drag.

Answer 13

Weight, thrust

Question 14

Lift and weight are in opposition to each other.
Induced lift can be increased by changing the ___ of the ___.

Answer 14

Camber, airfoil

Question 15

Occurs when lift is destroyed and the force of weight takes over

Answer 15

A stall

Question 16

The sudden displacement of air and the resulting wedged-shaped wave

Answer 16

Shock wave

Question 17

The total weight limitation of an airplane

Answer 17

Maximum gross weight

Question 18

If a pilot subtracts the empty weight from the maximum gross weight, the result is how many pounds can be loaded into the airplane, called

Answer 18

Useful load

Question 19

Mach is the ratio of the speed of an object to the speed of sound in the air

Answer 19

TRUE

Question 20

All fluids possess viscosity, which is the resistance to flow, but air is not included here

Answer 20

FALSE

Question 21

Slowing the flow rate is known as

Answer 21

Viscous drag

Question 22

On an in-flight aircraft, laminar and turbulent airflow are found in the same locations

Answer 22

FALSE

Question 23

The angle formed by the airfoil chord and the relative wind direction

Answer 23

The angle of attack

Question 24

Induced lift is caused by the angle of attack

Answer 24

FALSE
(by changing the camber/curvature of the airfoil shape of the wing; & changing the angle of attack causes both induced and dynamic lift)

Question 25

Dynamic lift is caused by the camber.

Answer 25

FALSE (Changing the angle of attack gains both induced and dynamic lift)

Question 26

Positive atmospheric pressure at the bottom of the wing only increases the induced lift

Answer 26

TRUE

Question 27

Generally, the less dense the air, the less lift is available

Answer 27

TRUE