Principle of flight

Question 1

What is the most correct definition of a glide range

Answer 1

The glide range does not vary with the weight of an aircraft

Question 2

The correct meaning of the term “ambient pressure” is

Answer 2

A pressure affected by the presence of the aircraft

Question 3

What does it mean Iroh for chord line

Answer 3

A body that gives a large lift force comparing with its drag when setting at a small angle to a moving airstream

Question 4

Washout on a wing is

Answer 4

The decrease in the angle of incidence for the wing root to the tip

Question 5

What is the correct definition for aspect ratio

Answer 5

Is the ratio of the wing’s span to eat geometric chord

Question 6

What are the characteristics of a swept wing

Answer 6

Swept wings are designed to achieved higher cruise speed but with poor lift capabilities especially at lower speed

Question 7

What are the disadvantages for swept wing

Answer 7

Poor lift qualities, higher stall speed, speed instability, wing-tip deep stalling tendency

Question 8

In which part of the wing does a swept wing stall first

Answer 8

Swept wing will stall at the wing tip first

Question 9

Why does a swept wing stall first at the wing tip

Answer 9

Because the swept wing has a greater loading experience at the wing tip leading to a higher angle of incidence

Question 10

State the correct definition of a Dutch roll

Answer 10

Dutch role is a couple lateral-directional oscillation in which the rolling motion is phased to precede the yawing motion

Question 11

What are the main effect during at Dutch roll

Answer 11

Dutch roll causes the outer wing to travel faster becomes more straight to the relative airflow and the inner wing to travel slower becomes more swept to the airflow

Question 12

What is the correct definition for a Dutch roll

Answer 12

Dutch rule is an oscillatory instability around longitudinal axis of the aircraft induced either by a natural disturbance or by a un/commanded yaw input on a swept wing aircraft

Question 13

What is the correct definition of a lateral stability

Answer 13

Lateral stability is the tendency for an aircraft to regain a laterally level position around the longitudinal axis on release of the ailerons during a sideslip

Question 14

What is the correct definition for longitudinal stability

Answer 14

Longitudinal stability is the tendency for an aircraft to regain a stable pitch position around its lateral axis after a disturbance

Question 15

What is the aileron reversal

Answer 15

Aileron reversal occurs at high speeds when the air loads are large enough to cause an increase in lift

Question 16

What is true about the spoilers

Answer 16

The spoilers cause an overall loss of lift which may cause a loss of height and is not recommended when flying near to the ground

Question 17

Which are the two advantages of spoiler comparing with the ailerons

Answer 17

Decreased adverse yaw but more effective at low speeds

Question 18

Why do the spoilers blow back

Answer 18

The spoilers blow back because the high air loads experience on their surveys are greater than their design limit

Question 19

What is the main purpose of extending the flap in-flight

Answer 19

Flaps in-flight will cause a nose up pitching moment because the center of pressure remains in front of the center of gravity

Question 20

What is true about extending the flap in-flight

Answer 20

Lowering the flap in flight will cause a loss of lift if not compensated by increasing the speed and changing the attitude

Question 21

What is a yaw damper

Answer 21

A gyro which is sensitive to changes in yaw

Question 22

What is important about the stabilizer

Answer 22

To provide a longitudinal balancing force to the aircraft

Question 23

The center of pressure:

Answer 23

Is a single point acting at right angle to the relative airflow