Chapter 1

Question 1

Which force produced by the wings supports the airplane in flight?

Answer 1

a

Question 2

Which force is produced by the engine-propeller?

Answer 2

a

Question 3

Which force resists the motion of the airplane through the air?

Answer 3

a

Question 4

Lift and weight are generally how much greater than thrust and drag in straight and level flight at a constant speed?

Answer 4

a

Question 5

What relationships exist between lift and weight, and between thrust and drag, when the airplane is flying straight and level at a constant airspeed?

Answer 5

a

Question 6

Which surface is designed to create an aerodynamic lifting force as air flows over it?

Answer 6

a

Question 7

What do you call a steady airflow around an airfoil in which succeeding parcels of air follow each other?

Answer 7

a

Question 8

Where on an airfoil does the smooth boundary layer flow separate from the airfoil surface and become turbulent?

Answer 8

a

Question 9

Static pressure in the air is exerted in which direction(s)?

Answer 9

a

Question 10

Which pressure is caused by motion?

Answer 10

a

Question 11

What is total pressure energy the sum of?

Answer 11

a

Question 12

In streamline flow, if dynamic pressure increases, what happens to the static pressure?

Answer 12

a

Question 13

What does the expression “1/2V2” represent?

Answer 13

a

Question 14

What line is drawn half-way between the upper and lower surfaces of the wing to give an indication of its curvature?

Answer 14

a

Question 15

The wing shape and the angle of attack determine the profile that the airfoil presents to the airflow. What else do they determine?

Answer 15

a

Question 16

True or False? Forces acting on an airfoil in flight, as a result of the changes in static pressure around it, may be considered to act through the center of pressure.

Answer 16

T

Question 17

Describe how the relative airflow relates to the flight path of an airplane?

Answer 17

a

Question 18

Define the term angle of attack?

Answer 18

a

Question 19

If the angle of attack is gradually increased in normal cruise flight, what will happen to the lifting ability of the wing?

Answer 19

a

Question 20

On a wing, the force of lift acts perpendicular to the force of drag acts parallel to the:
A. chord line
B. flight path
C. longitudinal axis

Answer 20

a

Question 21

What does the angle of attack of a wing control directly?

Answer 21

a

Question 22

What happens to the center of pressure as the angle of attack is gradually increased in the normal flight range?

Answer 22

a

Question 23

True or False? Beyond the stall angle of attack, the lifting ability of the wing decreases significantly and the center of pressure moves rearward on the wing.

Answer 23

T

Question 24

How will frost on the wings of an airplane affect takeoff performance?

Answer 24

a

Question 25

What is drag?

Answer 25

a

Question 26

True or false? If drag can be kept low, thrust can be kept low.

Answer 26

t

Question 27

Describe the two basic groups of total drag.

Answer 27

a

Question 28

True or False? As airspeed increases, drag caused by skin friction decreases.

Answer 28

a

Question 29

How can form drag be reduced?

Answer 29

a

Question 30

True or false? The spanwise flow of air on the upper wing surface is toward the wing root.

Answer 30

a

Question 31

When is the formation of wingtip vortices and induced drag greatest?

Answer 31

a

Question 32

When is the total drag at a minimum?

Answer 32

a

Question 33

Why is the thrust requirement greater at high speeds and low angles of attack?

Answer 33

a

Question 34

True or false? Minimum drag means minimum thrust to maintain airspeed.

Answer 34

a

Question 35

What does the lift/drag ratio describe?

Answer 35

a

Question 36

What effect does extending the flaps have on the camber of the wing?

Answer 36

a

Question 37

Aside from lift, what do trailing-edge flaps increase?

Answer 37

a

Question 38

The percentage increase in drag usually exceeds that in lift when the flaps are extended. Do flaps therefore increase the lift/drag ratio?

Answer 38

a

Question 39

True or false? The extension of flaps on a glide approach allows a steeper approach path at a constant speed.

Answer 39

a

Question 40

True or false? With flaps extended, the nose attitude of the airplane is higher.

Answer 40

a

Question 41

True or false? Slots increase the angle of attack at which the wing stalls by delaying the separation of the smooth airflow over the upper surface of the wing.

Answer 41

a

Question 42

What does a propeller convert engine torque into?

Answer 42

a

Question 43

True or false? At high altitudes, when the air is less dense, a propeller will be more efficient.

Answer 43

a

Question 44

Why is a propeller blade twisted?

Answer 44

a

Question 45

True or false? A fixed-pitch propeller is efficient at only one set of RPM and airspeed conditions.

Answer 45

a

Question 46

True or false? A constant-speed propeller has a variable pitch angle and is efficient over a wide range of RPM and airspeed conditions.

Answer 46

True

Question 47

As the forward speed of an airplane with a fixed-pitch propeller increases, with the RPM remaining constant, the angle of attack of the propeller blades: a. decreases as forward speed increases. b. increases as forward speed increases. c. remains unaltered as forward speed increases.

Answer 47

a

Question 48

In an airplane with a clockwise rotating propeller, what does P-factor, or asymmetric blade effect cause the airplane to do?

Answer 48

a

Question 49

During the takeoff roll in a single-engine airplane, the left tire will carry more load. Why?

Answer 49

a

Question 50

When is torque effect greatest in a single-engine airplane?

Answer 50

a

Question 51

How can you keep the airplane tracking straight down the runway during the takeoff roll in a single-engine airplane?

Answer 51

a