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PRINCIPLES OF FLIGHT-U5

Total questions: 67

Worksheet time: 48mins

Name
Class
Date
1.

A Longerons is a

a)
lateral line on an aircraft wing.
b)
vertical line on aircraft fuselage.
c)
longitudinal line on the aircraft fuselage.
2.
The main forces on an aircraft structure are
a)
tension, compression, torsion, and shear.
b)
tension, compression, torsion and strain.
c)
tension, compression, twisting, and shear.
3.

A member taking a compression load is called a

a)

Strut

b)
cable.
c)
fairing.
4.
Which of the following is primary structure for fuselage?
a)
Frame.
b)
Rib
c)
Stringer.
5.

Which parts of the aircraft are classified secondary structures?

a)
These parts of the airframe are highly stressed but if damaged will not cause failure of the aircraft.
b)
These parts of the airframe are highly stressed and if damaged may cause failure of the aircraft and loss of life.
c)
These are lightly stressed parts such as fairings, wheel shields and minor component brackets et
6.
One purpose of a rib is to
a)
support the bending loads on a fuselage.
b)
form the main lateral member in an aerofoil.
c)
maintain the correct contour of aerofoils covering.
7.
The four main structural items making up a horizontal stabilizer are
a)
spar, rib, bulkheads, skin panels.
b)
spar, rib, stringers, skin panels.
c)
spar, rib, longerons, skin panels.
8.
Which statement below that can best relate to the advanced composite material?
a)
Low strength to weight ratio
b)
High strength to weight ratio
c)
High stiffness to strength ratio
9.
The main function of aircraft’s bulkhead is to
a)
maintains the pressure required for aircraft cabin.
b)
stabilize the airplane movement during flight.
c)
improve fuselage bending strength during flight.
10.
Tension is the stress of
a)
crush or compression.
b)
elongation or stretch.
c)
twisting or bending.
11.
Strain can be defined as the ratio of
a)
original length/stress.
b)
change in length/original length.
c)
original length/change in length.
12.
Main spar is classified as which structural category?
a)
Tertiary
b)
Secondary
c)
Primary
13.

Define tensile stress and provide an example.

a)

Tensile stress refers to the pressure applied to a material in a liquid state.

b)

Tensile stress is the weight of a material divided by its volume.

c)

Tensile stress is the force per unit area in a material under tension, such as a steel cable lifting a weight.

d)

An example of tensile stress is a rubber band being compressed.

14.

What is compressive stress? How does it differ from tensile stress?

a)

Compressive stress is the same as tensile stress.

b)

Compressive stress is the stress that results from forces that compress a material, while tensile stress results from forces that stretch a material.

c)

Tensile stress occurs when a material is compressed.

d)

Compressive stress only applies to liquids and gases.

15.

Explain shear stress and its significance in materials.

a)

Shear stress is the force acting perpendicular to a surface.

b)

Shear stress only occurs in liquids and not in solids.

c)

Shear stress is irrelevant in material science.

d)

Shear stress is the force per unit area acting parallel to a surface, significant for understanding material deformation and failure.

16.

What is the formula for calculating stress?

a)

Stress = Force / Area

b)

Stress = Force * Area

c)

Stress = Force + Area

d)

Stress = Area / Force

17.

What is the relationship between stress and strain known as?

a)

Bernoulli's Principle

b)

Newton's Law

c)

Young's Modulus

d)

Hooke's Law

18.

Explain Hooke's Law in your own words.

a)

Hooke's Law states that the force on a spring is proportional to its mass.

b)

Hooke's Law describes the linear relationship between the force exerted on a spring and its displacement.

c)

Hooke's Law explains the relationship between temperature and pressure in gases.

d)

Hooke's Law indicates that springs can only be stretched to a certain limit before breaking.

19.

What is the modulus of elasticity?

a)

The modulus of elasticity is the volume of a material under pressure.

b)

The modulus of elasticity measures the temperature of a material.

c)

The modulus of elasticity is the weight of a material.

d)

The modulus of elasticity is a measure of a material's stiffness, defined as the ratio of stress to strain.

20.

Differentiate between elastic and plastic deformation.

a)

Elastic deformation is always permanent, while plastic deformation is temporary.

b)

Plastic deformation can be reversed, while elastic deformation cannot.

c)

Elastic deformation is reversible, while plastic deformation is permanent.

d)

Elastic deformation occurs at high temperatures, while plastic deformation occurs at low temperatures.

21.

What is the significance of the ultimate tensile strength?

a)

It represents the color of a material under stress.

b)

It indicates the thermal conductivity of a material.

c)

The ultimate tensile strength indicates the maximum stress a material can withstand before failure.

d)

It measures the density of a material.

22.

Describe the concept of Poisson's ratio.

a)

Poisson's ratio quantifies how much a material deforms in the lateral direction when subjected to axial stress.

b)

Poisson's ratio describes the electrical conductivity of a material.

c)

Poisson's ratio indicates the thermal expansion of a material.

d)

Poisson's ratio measures the density of a material under pressure.

23.

What is a stress-strain curve? What information does it provide?

a)

A stress-strain curve is a diagram showing temperature changes in materials.

b)

A stress-strain curve is a chart that compares different materials' colors.

c)

A stress-strain curve is a graph that shows the relationship between stress and strain in a material, providing information on its mechanical properties.

d)

A stress-strain curve is a table that lists material properties.

24.

Explain the difference between ductile and brittle materials.

a)

Ductile materials shatter into pieces when stressed.

b)

Brittle materials can be easily stretched without breaking.

c)

Ductile materials are always heavier than brittle materials.

d)

Ductile materials deform plastically and can be stretched, while brittle materials fracture with minimal deformation.

25.

What role does fatigue play in material failure?

a)

Fatigue improves material strength over time.

b)

Fatigue has no impact on material integrity.

c)

Fatigue leads to material failure by causing microcracks to form and grow under repeated stress, eventually resulting in sudden failure.

d)

Fatigue only affects materials at high temperatures.

26.

What is the difference between normal stress and shear stress?

a)

Normal stress acts perpendicular to a surface, while shear stress acts parallel to a surface.

b)

Normal stress is always greater than shear stress.

c)

Normal stress can only occur in solids.

d)

Shear stress is only present in fluids.

27.

A cylindrical rubber band is stretched by a force of 50 N, causing it to elongate by 0.1 m. If the original length of the rubber band is 1 m, what is the strain experienced by the rubber band?

a)

0.01

b)

0.05

c)

0.1

d)

0.5

28.

A metal rod with a length of 1.5 m and a cross-sectional area of 0.005 m^2 is subjected to a tensile force of 3000 N. Calculate the stress experienced by the rod.

a)

6 N/m26 \, \text{N/m}^2

b)

600 N/m2600 \, \text{N/m}^2

c)

6000 N/m26000 \, \text{N/m}^2

d)

60000 N/m260000 \, \text{N/m}^2

29.

In which point is the material permanently deformed but without fracturing?

a)

A

b)

B

c)

C

d)

D

30.

What is point B called?

a)

Elastic limit

b)

Plastic limit

c)

Fracture point

31.

A string has a diameter of 1 cm and the original length of 2 m. The string is pulled by a force of 200 N. Determine the change in length of the string. Young’s modulus of the string is 5 x 109 N/m2

a)

0.42 m

b)

0.33 m

c)

0.26 m

d)

0.18 m

32.

A nylon string has a diameter of 2 mm, pulled by a force of 100 N. Determine the stress.

a)

2.35 x 107 N/m2

b)

3.15 x 107 N/m2

c)

4.15 x 107 N/m2

33.

What happens in point E?

a)

Plastic limit

b)

Elastic limit

c)

Brittle failure

34.

What kind of behavior is exhibited in point D?

a)

Elastic

b)

Plastic

c)

Brittle

35.

What is zone A called?

a)

Plastic zone

b)

Elastic zone

c)

Brittle zone

36.

Which type of stress is experienced when a material is twisted?

a)

Compressive stress

b)

Tensile stress

c)

Volumetric stress

d)

Shear stress

37.

What is the relationship between stress and strain in a material under elastic deformation?

a)

Exponential relationship

b)

No relationship

c)

Inversely proportional

d)

Directly proportional

38.

When a material is compressed, the type of stress that occurs is known as

a)

Elastic stress

b)

Shear stress

c)

Tensile stress

d)

Compressive stress

39.

Which of the following is a unit of strain?

a)

dimensionless

b)

m

c)

Pa

d)

kg/m3

40.

A wire of length 2 m2\ m and cross-sectional area 1 mm21\ mm^{2} is subjected to a tensile force of 1000 N1000\ N . What is the tensile stress in the wire?

a)

0.1 N/mm20.1\ N/mm^{2}

b)

10 N/mm210\ N/mm^{2}

c)

1 N/mm21\ N/mm^{2}

d)

1000 N/mm21000\ N/mm^{2}

41.

Identify the correct image showing shear stress

a)

b)

c)

d)

42.

The ratio of shear stress to shear strain is known as the modulus of

(a)  

43.

What is the formula for Young's Modulus?

a)

StressStrain\frac{\text{Stress}}{\text{Strain}}

b)

StrainStress\frac{\text{Strain}}{\text{Stress}}

c)

Stress×Strain\text{Stress} \times \text{Strain}

d)

Strain−Stress\text{Strain} - \text{Stress}

44.

What is the typical unit for strain?

a)

Metre (m)

b)

Newton (N)

c)

Dimensionless

d)

Pascal (Pa)

45.

What is the unit of stress in the International System of Units (SI)?

a)

Pascal (Pa)

b)

Newton (N)

c)

Joule (J)

d)

Watt (W)

46.

In a tensile test, what is the point called where the material starts to deform plastically?

a)

Elastic Limit

b)

Yield Point

c)

Fracture Point

d)

Ultimate Strength

47.

What is the typical outcome when a material is subjected to stress beyond its elastic limit?

a)

It returns to its original shape.

b)

It undergoes plastic deformation.

c)

It becomes more elastic.

d)

It becomes more brittle.

48.

What is strain in engineering?

a)

The force applied to an object per unit area

b)

The deformation of an object under the influence of stress

c)

The elongation of a material under stress

d)

The weight of items pressing down on your hand and arm

49.

What is stress in engineering terms?

a)

The weight of items pressing down on your hand and arm

b)

The force applied to an object per unit area

c)

The deformation of an object under the influence of stress

d)

The elongation of a material under stress

50.

Which section reversible ?

a)

A

b)

B

c)

C

d)

D

51.

Which letter is pointing to where the material will break?

a)

A

b)

B

c)

C

d)

D

52.

Which letter points to the section that shows elastic deformation?

a)

A

b)

B

c)

C

d)

D

53.

Which letter is pointing to the elastic limit?

a)

A

b)

B

c)

C

d)

D

54.

What is the process when stress causes a material to strain, but afterward the material returns to its original shape?

a)

Stress

b)

Strain

c)

Elastic Deformation

d)

Plastic Deformation

e)

Fault

55.

What is the deformation of materials in response to stress?

a)

Stress

b)

Strain

c)

Elastic Deformation

d)

Plastic Deformation

e)

Fault

56.

stress

a)

the process by which the shape of a rock changes because of stress

b)

the amount of force per square unit area on a given material

c)

stress that occurs when an object is stretched

d)

stress that occurs when an object is squeezed

57.

What is the main body of an aircraft called?

a)

cockpit

b)

fuselage

c)

wings

d)

tail

58.

What type of wings are commonly used in small aircraft for their simplicity?

a)

Tapered wings

b)

Delta wings

c)

Rectangular wings

d)

Elliptical wings

59.

Which type of wing is most commonly associated with fighter jets for high-speed maneuvers?

a)

Delta Wing

b)

Elliptical Wing

c)

Rectangular Wing

d)

Sweptback Wing

60.

What type of load-bearing structure distributes aerodynamic loads to the fuselage?

a)

Fairings

b)

Wing Spars

c)

Control surfaces

d)

Nacelles

61.

Which of the following is NOT a factor in selecting materials for aircraft structures?

a)

Weight

b)

Cost

c)

Availability

d)

Color

62.

Which type of fuselage relies largely on the strength of its skin to carry loads?

a)

Truss

b)

Monocoque

c)

Semi-Monocoque

d)

Rigid

63.

Which material is commonly used in primary aircraft structures for its high strength?

a)

Aluminum alloys

b)

Plastic

c)

Wood

d)

Glass

64.

Which of the following is a primary structure in an aircraft?

a)

Fairings

b)

Wing Spars

c)

Passenger Seats

d)

Interior Panels

65.

What is the purpose of stress analysis in aircraft design?

a)

To calculate fuel efficiency during flight

b)

To assess the comfort of passenger seating

c)

To determine the color scheme of the aircraft

d)

The purpose of stress analysis in aircraft design is to ensure structural integrity and safety under various loads.

66.

How do environmental factors affect aircraft materials over time?

a)

Environmental factors have no impact on aircraft materials.

b)

Environmental factors only affect the aesthetics of aircraft materials.

c)

Environmental factors cause degradation of aircraft materials through corrosion, delamination, and brittleness.

d)

Environmental factors improve aircraft materials over time.

67.

What are the primary materials used in aircraft construction?

a)

Wood and glass

b)

Plastic and rubber

c)

Aluminum, titanium, composite materials, and steel

d)

Copper and lead

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