WorksheetsAerospace Semester Exam Review
Total questions: 50
Worksheet time: 3hrs 30mins
Name
Class
Date
1.
1. A centroid location is determined by an object's line of ...
a)
symmetry
b)
asymmetry
2.
2. What is Moment of Inertia?
a)
is a scientific property of a cross section that gives important information about how that cross-sectional area is distributed about a centroidal axis.
b)
is a literal property of a cross section that gives important information about how that cross-sectional area is distributed about a centroidal axis
c)
is a mathematical property of a cross section (measured in inches4) that gives important information about how that cross-sectional area is distributed about a centroidal axis
3.
3. A higher moment of inertia produces a greater resistance to deformation.
a)
True
b)
False
4.
4. When calculating the moment of Inertia, what does the b stand for?
a)
Thickness of Sample
b)
Width of Sample
c)
Significant Influence
5.
5. When calculating the moment of Inertia, what does the h stand for?
a)
Thickness of Sample
b)
Width of Sample
c)
deformation
d)
resistance
6.
6. Why are composite materials used in structural design?
a)
It's cheaper
b)
allows support for a weak material that is further away from the beam's center of gravity
c)
it creates strong material that is heavy
7.
7. In general, a higher modulus of elasticity produces a lower resistance to deformation.
a)
True
b)
False
8.
8. What is tension stress?
a)
A body being squeezed
b)
A body being stretched
9.
9. What is compression?
a)
A body being squeezed
b)
A body being stretched
10.
10. How do you find stress?
a)
Area/Load
b)
Amount of stretch/original length
c)
original length/amount of stretch
d)
load/area
11.
11. How do you find strain?
a)
Area/Load
b)
Amount of stretch/original length
c)
original length/amount of stretch
d)
load/area
12.
12. What is statics?
a)
The study of forces and their effects on a system in a state of ongoing motion.
b)
The study of forces and their effects on a system in a state of stagnant motion
c)
The study of forces and their effects on a system in a state of rest or uniform motion
13.
13. What is translational equilibrium?
a)
The state in which there are no unbalanced forces acting on a body
b)
The state in which there are unbalanced forces acting on a body
c)
The state in which there are some unbalanced forces acting on a body
14.
14. What is rotational equilibrium?
a)
The state in which the sum of all clockwise moments equals the sum of all counterclockwise moments about a pivot point
b)
The state in which the sum of all clockwise moments equals the sum of all clockwise moments about a pivot point
c)
The state in which the sum of all counterclockwise moments equal the sum of all counterclockwise moments about a pivot point
15.
15. What are some common aerospace materials?
a)
aluminum alloys
b)
titanium alloys
c)
magnesium alloys
d)
nickel alloys
e)
all of the above
16.
16. What are some common aerospace materials?
a)
wood
b)
steel
c)
fiber-reinforced composites
d)
wood and steel
e)
wood, steel, and fiber-reinforced composites
17.
17. What are factors for selecting materials?
a)
function and production
b)
function, material properties, and production
c)
function
d)
production
18.
18. What does production consist of?
a)
availability and consistency of material
b)
machinability
c)
none of these
d)
machinability, availability, and consistency of material
19.
19. What is included in material properties?
a)
All of the above
b)
Strength to weight ratio
c)
Stiffness
d)
toughness
e)
Fatigue and effects of environmental heating
20.
20. How many years is an average commercial aircraft?
a)
20 years
b)
25 years
c)
30 years
d)
40 years
21.
21. Average maintenance an service cost are ... the original purchase price.
a)
double
b)
triple
c)
same
22.
22. Increasing material density increases airframe weight and improves performance
a)
True
b)
False
23.
23. What are characteristics of wood?
a)
Sensitivity to moisture
b)
Rot and insect damage
c)
Natural product lower consistency than man-made
d)
all of the above
24.
24. Wood is rarely used today in production aircraft.
a)
True
b)
False
25.
25. Pure aluminum is relatively ..
a)
firm
b)
soft
c)
sharp
26.
26. What is the currently most widely used material?
a)
wood
b)
metal alloy
c)
titanium alloy
d)
aluminum alloy
27.
27. Aluminum alloy has terrible resistance to chemical corrosion.
a)
True
b)
False
28.
28. Strength and stiffness are affected by
a)
all of the above
b)
sheet
c)
plate
d)
bar
e)
extrusion
29.
29. Stronger aluminum is more brittle.
a)
True
b)
False
30.
30. Steel is very expensive and difficult to fabricate.
a)
True
b)
False
31.
31. As carbon content ... , strength and brittleness ... .
a)
increases, increase
b)
increases, decreases
c)
decreases, increases
d)
decreases, decreases
32.
32. Typical steel alloys are ... carbon
a)
5%
b)
10%
c)
3%
d)
1%
33.
33. Properties of steel are influenced by
a)
heat treating
b)
tempering
c)
heat treating and tempering
34.
34. Titanium is corrosion-resistant.
a)
True
b)
False
35.
35. Titanium does not have high fabrication cost.
a)
True
b)
False
36.
36. Titanium is used for what type of aircraft?
a)
higher-speed
b)
Medium-speed
c)
Lower-speed
37.
37. Magnesium is used for ...
a)
all of the above
b)
engine mounts
c)
wheels
d)
control hinges
e)
brackets
38.
38. Magnesium is prone to corrosion and is flammable.
a)
True
b)
False
39.
39. Magnesium should be used in areas that are difficult to inspect.
a)
True
b)
False
40.
40. Hastelloy is used primarily in what parts?
a)
wings
b)
wheels
c)
engine
d)
brackets
41.
41. Nickel alloy is ... than aluminum and titanium.
a)
lighter
b)
heavier
42.
42. Composites are used in
a)
wings
b)
forward fuselage
c)
horizontal stabilizer
d)
all of the above
43.
43. Modern fighters consist of ... composite material.
a)
10%
b)
20%
c)
30%
d)
40%
44.
44. The Boeing 787 uses upward of how many composites?
a)
30%
b)
40%
c)
50%
d)
60%
45.
45. Ceramic has high temperature resistance
a)
True
b)
False
46.
46. Advantages of composites include ...
a)
all but short life
b)
Strength-to-weight ratio
c)
long life
d)
short life
e)
Dampen vibration
47.
47. Composite materials must have 5 basic parts.
a)
True
b)
False
48.
48. All composites MUST NOT have an identifiable reinforcement and matrix.
a)
True
b)
False
49.
49. Composite materials include ...
a)
reinforcement
b)
matrix
c)
reinforcement and matrix
50.
50. Reinforcement provides the majority of strength.
a)
True
b)
False
100 %
