AEROSPACE MATERIALS FINAL EXAM 2026/2027
QUESTIONS AND SOLUTIONS RATED A+
✔✔It is common practice to size the machines, so that the maximum design strength is
below the yield strength by an appropriate factor. This is sometimes refereed to as the
factor of safety. This value is used to provide a design margin over the theoretical
design capacity to allow for uncertainty in the design process or bad handling during
aircraft operation. The factor used is determined by the conditions over which the
designer has no control and accounts for the uncertainties involved in the design and
manufacturing process and vehicle operation after manufacturing. - ✔✔Safety Factor
✔✔In the late 1920's, John Northrop designed the Lockheed Vega, which became one
of the most successful planes of the era. What was the major design innovation that
was incorporated in the aircraft that led to its exceptional.
a. Composite construction
b. stressed skin construction
c. Truss Type construction - ✔✔Stressed Skin Construction
✔✔In early aircraft structure how was rigidity achieved?
a. by using wire bracing between structural members
b. through the use of composite material
c. using thicker metal for aircraft skins - ✔✔by using wire bracing between structural
members
✔✔Why did the biplane dominate over the monoplane in early aircraft design?
a. biplanes were stronger and safer than the early monoplanes
b. the biplane was cheaper to build
c. the monoplane generated more drag than the biplane - ✔✔biplanes were stronger
and safer than the early monoplanes
✔✔What is the purpose of stringers and formers on an aircraft structure?
a. They are used during the construction of metal aircraft but removed before the
aircraft is flown
b. They are pieces of metal or woof used to give the aircraft a better aerodynamic shape
and give the skin a place to attach
c. They are only used on pure monococque structures. - ✔✔They are pieces of metal or
woof used to give the aircraft a better aerodynamic shape and give the skin a place to
attach
✔✔What is meant by a stressed skin structure?
a. The skin has been stressed so much it cracks
b. The aircraft skin carries all or part of the load
c. The aircraft skin is stretched over a form - ✔✔The aircraft skin carries all or part of
the load
, ✔✔What type of structure is used in most modern aircraft constructed of sheet metal?
a. Warren Truss
b. Semi-Monococque
c. Composite - ✔✔Semi-Monococque
✔✔What is a rip stop doubler?
a. An extra piece of aircraft fabric
b. an extra piece of metal reinforcement
c. an extra piece of fiberglass material. - ✔✔an extra piece of metal reinforcement
✔✔Where are ripstop doublers used?
a. On fabric covered aircraft when the fabric is torn
b. on pressurized stressed skin metal aircraft to reinforce areas of high stress
c. on composite aircraft to reduce fabric elongation - ✔✔on pressurized stressed skin
metal aircraft to reinforce areas of high stress
✔✔What type of construction was used in the DC-3?
a. warren truss
b. semi-monococque
c. composite - ✔✔semi-monococque
✔✔Why was the DC-3 considered such an important design in terms of commercial
aviation? - ✔✔It was the first aircraft where the airliners could make a profit without the
help of government subsidiaries.
✔✔ The main or central structure of a heavier-than-air aircraft, typically streamlined,
which carries the crew and passengers and to which the wings are attached -
✔✔Fuselage
✔✔A principal span-wise structural member of a wing or other airfoil - ✔✔Spar
✔✔A principal longitudinal (fore and aft) member of the framing of an airplane fuselage,
usually continuous across a number of points of support. - ✔✔Longeron
✔✔A supporting brace that bears compression loads, tension loads, or both, as in a
fuselage between the longerons or in a landing gear to transmit the airplane. - ✔✔Strut
✔✔A longitudinal member installed between fuselage frames and former to give support
and strength to the skin. - ✔✔Stringer
✔✔A chordwise member used to give the wing its shape and to transmit the load from
the fabric or other covering to the spar - ✔✔Rib
QUESTIONS AND SOLUTIONS RATED A+
✔✔It is common practice to size the machines, so that the maximum design strength is
below the yield strength by an appropriate factor. This is sometimes refereed to as the
factor of safety. This value is used to provide a design margin over the theoretical
design capacity to allow for uncertainty in the design process or bad handling during
aircraft operation. The factor used is determined by the conditions over which the
designer has no control and accounts for the uncertainties involved in the design and
manufacturing process and vehicle operation after manufacturing. - ✔✔Safety Factor
✔✔In the late 1920's, John Northrop designed the Lockheed Vega, which became one
of the most successful planes of the era. What was the major design innovation that
was incorporated in the aircraft that led to its exceptional.
a. Composite construction
b. stressed skin construction
c. Truss Type construction - ✔✔Stressed Skin Construction
✔✔In early aircraft structure how was rigidity achieved?
a. by using wire bracing between structural members
b. through the use of composite material
c. using thicker metal for aircraft skins - ✔✔by using wire bracing between structural
members
✔✔Why did the biplane dominate over the monoplane in early aircraft design?
a. biplanes were stronger and safer than the early monoplanes
b. the biplane was cheaper to build
c. the monoplane generated more drag than the biplane - ✔✔biplanes were stronger
and safer than the early monoplanes
✔✔What is the purpose of stringers and formers on an aircraft structure?
a. They are used during the construction of metal aircraft but removed before the
aircraft is flown
b. They are pieces of metal or woof used to give the aircraft a better aerodynamic shape
and give the skin a place to attach
c. They are only used on pure monococque structures. - ✔✔They are pieces of metal or
woof used to give the aircraft a better aerodynamic shape and give the skin a place to
attach
✔✔What is meant by a stressed skin structure?
a. The skin has been stressed so much it cracks
b. The aircraft skin carries all or part of the load
c. The aircraft skin is stretched over a form - ✔✔The aircraft skin carries all or part of
the load
, ✔✔What type of structure is used in most modern aircraft constructed of sheet metal?
a. Warren Truss
b. Semi-Monococque
c. Composite - ✔✔Semi-Monococque
✔✔What is a rip stop doubler?
a. An extra piece of aircraft fabric
b. an extra piece of metal reinforcement
c. an extra piece of fiberglass material. - ✔✔an extra piece of metal reinforcement
✔✔Where are ripstop doublers used?
a. On fabric covered aircraft when the fabric is torn
b. on pressurized stressed skin metal aircraft to reinforce areas of high stress
c. on composite aircraft to reduce fabric elongation - ✔✔on pressurized stressed skin
metal aircraft to reinforce areas of high stress
✔✔What type of construction was used in the DC-3?
a. warren truss
b. semi-monococque
c. composite - ✔✔semi-monococque
✔✔Why was the DC-3 considered such an important design in terms of commercial
aviation? - ✔✔It was the first aircraft where the airliners could make a profit without the
help of government subsidiaries.
✔✔ The main or central structure of a heavier-than-air aircraft, typically streamlined,
which carries the crew and passengers and to which the wings are attached -
✔✔Fuselage
✔✔A principal span-wise structural member of a wing or other airfoil - ✔✔Spar
✔✔A principal longitudinal (fore and aft) member of the framing of an airplane fuselage,
usually continuous across a number of points of support. - ✔✔Longeron
✔✔A supporting brace that bears compression loads, tension loads, or both, as in a
fuselage between the longerons or in a landing gear to transmit the airplane. - ✔✔Strut
✔✔A longitudinal member installed between fuselage frames and former to give support
and strength to the skin. - ✔✔Stringer
✔✔A chordwise member used to give the wing its shape and to transmit the load from
the fabric or other covering to the spar - ✔✔Rib
