WorksheetsMidterm Formative Assessment No. 3
Total questions: 10
Worksheet time: 8mins
Which of the following best describes a composite material?
A single metal alloy used in aircraft structures
A combination of two or more distinct materials with different properties
A chemically homogeneous material with no boundaries between elements
A natural material with no need for reinforcement
Fiberglass, commonly used in aircraft non-structural components, is made from:
Woven carbon strands
Strands of molten silica glass woven into cloth
Polymer chains chemically bonded with resin
Metal matrix combined with ceramic fibers
Kevlar (Aramid fiber) is widely used in aircraft composites because of its:
Excellent compressive strength and rigidity
High tensile strength, toughness, and light weight
Superior heat resistance compared to ceramic fibers
Ability to prevent galvanic corrosion
Carbon/Graphite fibers differ from Kevlar primarily because they:
Are yellow in color and stretch more under load
Have higher compressive strength and stiffness
Are primarily used in non-structural components
Are heavier and less durable than fiberglass
The matrix in a composite structure primarily functions to:
Provide tensile strength to the structure
Hold the reinforcing fibers in position and bond them together
Reduce galvanic corrosion in the aircraft body
Act as a substitute for adhesives and finishes
Which resin system forms an irreversible shape when heated and cured, making it widely used in modern aircraft composites?
Polyester resin
Thermoplastic resin
Thermosetting epoxy resin
Ceramic resin
Laminated composites are built by:
Combining different metals with resins
Embedding fibers in foams for structural strength
Bonding multiple layers of reinforcing fabrics in a resin matrix
Spraying a resin coating over aluminum sheets
Which of the following is the most common nondestructive testing (NDT) method used to detect internal defects such as delamination in composite structures?
Tap test
Visual inspection
Ultrasonic inspection
X-ray photography
A current trend in advanced aircraft materials involves the use of ceramic matrix composites because they:
Are cost-effective substitutes for fiberglass
Offer improved performance in high-temperature environments
Replace adhesives in composite bonding
Reduce the need for polymer matrices
New-generation aircraft, such as the Boeing 787, increasingly use advanced composites because they:
Increase overall weight but reduce corrosion
Provide high strength-to-weight ratio and fuel efficiency
Eliminate the need for inspection and maintenance
Replace all metallic structures with ceramic layers
