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M11 Questions > 11.1 > Flashcards

11.1 Flashcards

1
Q

Which of these materials would be used to resist aerodynamic heat?

A

Titanium Alloy

Example: Titanium alloys are commonly used in aerospace applications for their high strength and heat resistance.

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2
Q

Which of these materials is least likely to resist aerodynamic heating?

A

Aluminium Alloy

Example: Aluminium alloys are not as heat-resistant as titanium alloys and are less suitable for high-temperature environments.

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3
Q

What are the two main types of shockwaves in supersonic flight?

A

Normal and oblique

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4
Q

What happens to airflow velocity across normal shockwave?

A

It decreases to subsonic velocity

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5
Q

What happens to airflow velocity across oblique shockwave?

A

It decreases but remains supersonic

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6
Q

What are the two types of shockwaves called?

A

Normal and oblique

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7
Q

Where does the greatest reduction in velocity and increase in aerodynamic heating occur?

A

At the various stagnation points on the aircraft

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8
Q

What material is used in aerodynamics to minimize strength reduction due to aerodynamic heating?

A

Titanium alloy

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9
Q

Which components of the wings are flight controls?

A

Slats, flaps, spoilers, and ailerons wing

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10
Q

The elevator is part of the

A

Horizontal stabilizer

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11
Q

Which of the following boundary layer control systems initiates flow separation at the wing root?

A

Stall wedges (strips)

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12
Q

What motion would be generated by a ruddervator if the surfaces moved in opposite directions

A

YAW

Example sentence: The ruddervator generates yaw motion when the surfaces move in opposite directions.

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13
Q

Which trim requires a specially designated surface

A

Pitch

Example sentence: Pitch trim requires a specially designated surface.

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14
Q

On swept wings what causes the tip stall

A

Increase boundary layer height

Example sentence: Tip stall on swept wings is caused by an increase in boundary layer height.

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15
Q

How are low speed characteristics improved on a transonic wing profile

A

Reduction of sweepback angle

Example sentence: Low speed characteristics on a transonic wing profile are improved by reducing the sweepback angle.

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16
Q

Aircraft stagnation points cause

A

Increase in pressure and decrease in velocity

Example sentence: Aircraft stagnation points cause an increase in pressure and a decrease in velocity.

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17
Q

What are the three names of the three main aircraft axis

A

Lateral, longitudinal, vertical

Example sentence: The three main aircraft axis are lateral, longitudinal, and vertical.

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18
Q

What are the motions around the 3 axis called

A

Yaw, pitch, roll

Example sentence: The motions around the three axis are called yaw, pitch, and roll.

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19
Q

Which of the following statements are correct

A

Pitch is movement around the lateral axis

Example sentence: Pitch is the movement around the lateral axis.

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20
Q

What are the primary flight control of the aircraft

A

Ailerons, elevators, rudders, and roll spoilers

Example sentence: The primary flight controls of the aircraft are ailerons, elevators, rudders, and roll spoilers.

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21
Q

How do the ailerons respond if the pilot rolls the aircraft to the left

A

Left wing moves up, and right wing moves down

Example sentence: When the pilot rolls the aircraft to the left, the left wing moves up, and the right wing moves down.

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22
Q

What controls rolling the aircraft in flight

A

The ailerons

Example sentence: Rolling the aircraft in flight is controlled by the ailerons.

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23
Q

What is the purpose of the vortex generator

A

They provide boundary layer with additional energy to prevent flow separation

Example sentence: The purpose of the vortex generator is to provide the boundary layer with additional energy to prevent flow separation.

24
Q

What is the purpose of balance tabs on control surfaces

A

To assist deflection of the control surface

Example sentence: Balance tabs on control surfaces assist in the deflection of the control surface.

25
Q

Which of the control surfaces is for pitch trim

A

Trimmable horizontal stab

Example sentence: The control surface for pitch trim is the trimmable horizontal stabilizer.

26
Q

What is the effect of pulling the control column rearward

A

Elevator deflect up, aircraft nose up

Example sentence: Pulling the control column rearward causes the elevator to deflect up and the aircraft nose to pitch up.

27
Q

What is the function of the flaps and leading edge devices

A

To increase lift

Example sentence: The flaps and leading edge devices function to increase lift.

28
Q

During subsonic flight the air is

A

Incompressible

29
Q

During supersonic flight the air is

A

Compressible

30
Q

When will a bow wave first occur on the leading edge of the aircraft

A

When the flight speed exceeds mach one

31
Q

An aircraft has just reached Mach crit. In what speed category will the airspeed at the trailing edge of the wings found

A

Subsonic speeds

32
Q

In which of the following speed ranges will both supersonic, and subsonic speeds affect the airflow of a body in flight

A

Transonic

33
Q

How does the static pressure change behind a normal shockwave compared to the static pressure in front of it

A

Static pressure increases

34
Q

What happens to air temp behind a shockwave

A

Temperature increases

35
Q

When does the boundary layer lose contact with the surface

A

When the kinetic energy inside the boundary layer is too low

36
Q

What is the increase in lift provided by the slat

A

Up to 35%

37
Q

Which of the following statements is true

A

Spoilers and speed brakes always reduce lift and increase drag

38
Q

Which is the disadvantage of the anti-balance tab

A

The pilot requires more effort to deflect the control surface

39
Q

Which of the following drawings is an anti balance tab

A

Tab follows surface but further

40
Q

When is the control surface correctly balanced

A

When the centre of gravity of the surface is located on the hinge line

41
Q

What is the critical mach number

A

The maximum speed an aircraft can travel without any local supersonic flow

42
Q

What happens to air temp behind a shockwave

A

Temperature increases

Example sentence: The air temperature behind the shockwave rises significantly.

43
Q

When does the boundary layer lose contact with the surface

A

When the kinetic energy inside the boundary layer is too low

44
Q

What is the increase in lift provided by the slat

A

Up to 35%

45
Q

Which of the following statements is true

A

Spoilers and speed brakes always reduce lift and increase drag

46
Q

Which is the disadvantage of the anti-balance tab

A

The pilot requires more effort to deflect the control surface

47
Q

Which of the following drawings is an anti balance tab

A

Tab follows surface but further

48
Q

When is the control surface correctly balanced

A

When the centre of gravity of the surface is located on the hinge line

49
Q

What is the critical mach number

A

The maximum speed an aircraft can travel without any local supersonic flow

50
Q

What is done to prevent extreme pressures and temperatures at the engine compressor at high speed flight

A

One normal shockwave and up to three oblique shockwaves are formed to slow the airflow

51
Q

Which is approximate wing sweep angle of a modern commercial airliner and what effect does it have on the critical mach number

A

30 degrees and an increase in critical mach number

52
Q

What can be said about changes in velocity pressure and density in shockwave

A

Changes occur suddenly and sharply

53
Q

What happens to airflow as an aircraft approaches the speed of sound mach one?

A

Areas of supersonic airflow increases and shockwave move closer to the trailing edge

54
Q

How is profile thickness expressed in aerodynamics

A

As the relationship between actual thickness divided by chord length

55
Q

How does the area rule effect an aircrafts transonic flight performance

A

It reduces wave drag

M11 Questions (21 decks)

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