Aircraft Stability - Final 4040

Question 1

What are the two types of stability?
dynamic
active
static
symmetric

Answer 1

dynamic
static

Question 2

What is the greatest contributor to the positive yaw stability of an aircraft?
wings
fuselage
vertical sabilizer

Answer 2

vertical stablizer

Question 3

The method by which an object oscillates over time after it has been disturbed is called ________.

Symmetric Stability

Static Stability

Dynamic Stability

Active Stability

Answer 3

dynamic stability

Question 4

An object that has an initial tendency to return to its equilibrium position is said to have _________.

Negative Dynamic Stability

Positive Dynamic Stability

Positive static stability

Neutral Static Stability

Answer 4

positive static stability

Question 5

Wings are a _________ contributor to an aircrafts yaw stability. The fuselage is a _________ contributor.

Negative / Negative

Negative / Positive

Positive / Negative

Positive / Positive

Answer 5

positive negative

Question 6

Adverse yaw is the tendency for an aircraft to yaw _______ its direction of roll. Provers roll is the tendency of an aircraft to roll _____________ the direction of its yaw.

away from / toward

away from / away from

toward / away from

toward / toward

Answer 6

away from / toward

Question 7

The motion of an object displaying neutral dynamic stability is called ___________.

Divergent Oscillation

Damped Oscillation

Undamped Oscillation

Answer 7

Undamped Oscillation

Question 8

The velocities below max endurance airspeed is known as __________. Airspeed in this region is _________.

the region of reverse command / stable

the region of normal command / stable

the region of normal command / unstable

the region of reverse command / unstable

Answer 8

the region of reverse command / unstable

Question 9

The motion of an object displaying positive dynamic stability is called ___________.

Damped Oscillation

Divergent Oscillation

Undamped Oscillation

Answer 9

damped oscillation

Question 10

With an airplane, what is the opposite of stability

Vibration

Maneuverability

Oscillation

Uncontrollability

Answer 10

maneuverability

Question 11

Anhedral wings are a ____________ contributor to lateral stability.
positive
neutral
negative

Answer 11

negative

Question 12

High mounted wings are _________ contributors of lateral stability. Low mounted wings are a _______ contributor.

Negative / Negative

Positive / Positive

Positive / Negative

Negative / Positive

Answer 12

Positive / Negative

Question 13

For positive longitudinal stability, the aerodynamic center of a wing should be _________ of the center of gravity
forward
aft

Answer 13

aft

Question 14

An object with positive static stability can have any type of dynamic stability.
true
false

Answer 14

true

Question 15

If an object is dynamically unstable it will never return to its original equilibrium position.
true
false

Answer 15

true

Question 16

The initial tendency for an object to accept its displacement position as its new equilibrium position is called _______.

Positive Dynamic Stability

Neutral Static Stability

Negative Dynamic Stability

Positive Static Stability

Answer 16

neutral static stability

Question 17

The motion of an object displaying negative dynamic stability is called ___________.

Divergent Oscillation

Undamped Oscillation

Damped Oscillation

Answer 17

Divergent Oscillation

Question 18

In airplanes, lateral stability concerns movement about the
lateral axis
longitudinal axis
yaw axis

Answer 18

Longitudinal axis

Question 19

Swept wings tend to move an aircraft’s aerodynamic center forward.
true
false

Answer 19

false

Question 20

Once the CG is aft of the neutral point, the aircraft becomes statically unstable.
true
false

Answer 20

true

Question 21

Stability is the tendency of an object to return to it’s state of equilibrium once disturbed from it.
true
false

Answer 21

true

Question 22

The initial tendency for an object to move toward or away from its original equilibrium position is called _______.

Static stability

Active Stability

Dynamic Stability

Symmetric Stability

Answer 22

static stability

Question 23

The tendency for an object to display greater and greater oscillations after its initial displacement is called _______.

Neutral Static Stability

Negative Dynamic Stability

Positive Dynamic Stability

Positive Static Stability

Answer 23

negative dynamic stability

Question 24

An object can have positive dynamic stability without having positive static stability
true
false

Answer 24

false

Question 25

What can be done to increase an aircraft's maneuverability? Use fly by wire technology for the actuation of flight controls Design an aircraft with large control surfaces Use hydraulically actuated flight controls Design an aircraft with weak stability

Answer 25

Design an aircraft with large control surfaces Design an aircraft with weak stability

Question 26

An aircraft with a large moment arm between the CG and the aerodynamic center of the horizontal stabilizer requires a large horizontal stabilizer. true false

Answer 26

false

Question 27

What is the location of the CG along the longitudinal axis where neutral static stability is called? The balance point The aerodynamic center The fulcrum The neutral point

Answer 27

the neutral point