AFAB 120 MIDTERM EXAM QUESTIONS
WITH 100% CORRECT ANSWERS
Why should aircraft be statically grounded - Answer-minimize fire hazard
What is more economical repairing a damaged part or making a new one - Answer-
depends on the damage
Most important factor about a freezer - Answer-it must be kept at the appropriate
temperature
What gives the primary strength to the composite structure, the resin matrix or the
reinforcing fibers - Answer-reinforcing fibers
The strength of a composite lies in the ability of the matrix to transfer stress to the
reinforcing fibers - Answer-True
Most aircraft resins are _____ resins - Answer-epoxy
The newer matrix materials display - Answer-stress distributing, heat resistance,
chemical resistance, durability
Resin matrix is a two-part system consisting of _____ and ______ - Answer-resin and
catalyst/hardener
What is a composite - Answer-it is the combination of two or more materials; the use of
a matrix and any reinforcing material
Generally, the matrix is a _____ and the reinforcing material is a ______ - Answer-
liquid, solid
What is the oldest form of composites - Answer-adobe
On aircraft what is one of the first types of composites used - Answer-dope and fabric
Why are composites materials so popular , why does the industry use them instead of
metal - Answer-stronger and lighter than metal and can be used to form complex parts
Are composite materials strong enough to be used on aircraft primary structure, if so,
why - Answer-advanced composites have been made to withstand flight stress
, What is an advanced composite - Answer-an advanced composite are materials that
can be used in primary structures
FRP - Answer-Fiber Reinforced Plastic
Can all composites be repaired the same way - Answer-no; advanced composites must
be repaired in a specific manner, doing otherwise ruins the material
Advantages to composites - Answer-light weight, form complex parts, reduced drag,
cheaper, simplifies construction
Uses of composites - Answer-can be used for primary and secondary structures
What are some of the disadvantages of composites - Answer-repair can be expensive
and its difficult to tell when a repair will be needed
3 common types of reinforcing fibers - Answer-fiberglass, aramid, carbon/graphite
which reinforcing fiber weighs more than most other composite fibers but has less
strength - Answer-fiberglass or glass cloth
e-glass and s-glass are common types of what - Answer-fiberglass
what is a hybrid - Answer-The combination of one or more reinforcing fibers/materials
This reinforcement material is characterized by its yellow color, lightweight, tensile
strength, and remarkable flexibility? what is its structural grade? - Answer-Aramid;
Kevlar 49
This fiber is black, very strong, and used for its rigid strength characteristics? what is it
composed of? - Answer-Carbon/Graphite
The strength of a reinforcing materials in a matrix is dependent on - Answer-weave of
the material, wetting process, application of the matrix, filament tensile strength and
design
The strength and stiffness of a composite depend on the orientation of the plies to the
load direction - Answer-True
Warp designated as - Answer-0 degrees
Bias designated as - Answer-45 degrees
Fill/Weft designated as - Answer-90 degrees
WITH 100% CORRECT ANSWERS
Why should aircraft be statically grounded - Answer-minimize fire hazard
What is more economical repairing a damaged part or making a new one - Answer-
depends on the damage
Most important factor about a freezer - Answer-it must be kept at the appropriate
temperature
What gives the primary strength to the composite structure, the resin matrix or the
reinforcing fibers - Answer-reinforcing fibers
The strength of a composite lies in the ability of the matrix to transfer stress to the
reinforcing fibers - Answer-True
Most aircraft resins are _____ resins - Answer-epoxy
The newer matrix materials display - Answer-stress distributing, heat resistance,
chemical resistance, durability
Resin matrix is a two-part system consisting of _____ and ______ - Answer-resin and
catalyst/hardener
What is a composite - Answer-it is the combination of two or more materials; the use of
a matrix and any reinforcing material
Generally, the matrix is a _____ and the reinforcing material is a ______ - Answer-
liquid, solid
What is the oldest form of composites - Answer-adobe
On aircraft what is one of the first types of composites used - Answer-dope and fabric
Why are composites materials so popular , why does the industry use them instead of
metal - Answer-stronger and lighter than metal and can be used to form complex parts
Are composite materials strong enough to be used on aircraft primary structure, if so,
why - Answer-advanced composites have been made to withstand flight stress
, What is an advanced composite - Answer-an advanced composite are materials that
can be used in primary structures
FRP - Answer-Fiber Reinforced Plastic
Can all composites be repaired the same way - Answer-no; advanced composites must
be repaired in a specific manner, doing otherwise ruins the material
Advantages to composites - Answer-light weight, form complex parts, reduced drag,
cheaper, simplifies construction
Uses of composites - Answer-can be used for primary and secondary structures
What are some of the disadvantages of composites - Answer-repair can be expensive
and its difficult to tell when a repair will be needed
3 common types of reinforcing fibers - Answer-fiberglass, aramid, carbon/graphite
which reinforcing fiber weighs more than most other composite fibers but has less
strength - Answer-fiberglass or glass cloth
e-glass and s-glass are common types of what - Answer-fiberglass
what is a hybrid - Answer-The combination of one or more reinforcing fibers/materials
This reinforcement material is characterized by its yellow color, lightweight, tensile
strength, and remarkable flexibility? what is its structural grade? - Answer-Aramid;
Kevlar 49
This fiber is black, very strong, and used for its rigid strength characteristics? what is it
composed of? - Answer-Carbon/Graphite
The strength of a reinforcing materials in a matrix is dependent on - Answer-weave of
the material, wetting process, application of the matrix, filament tensile strength and
design
The strength and stiffness of a composite depend on the orientation of the plies to the
load direction - Answer-True
Warp designated as - Answer-0 degrees
Bias designated as - Answer-45 degrees
Fill/Weft designated as - Answer-90 degrees
