Composites, aluminum alloys, and modern aerospace materials MCQs – Aerospace

1. Which of the following is a major advantage of composite materials in aerospace applications?
(A) High density and weight
(B) Superior strength-to-weight ratio
(C) High electrical conductivity
(D) Low thermal resistance

2. What is the primary strengthening mechanism in aluminum alloys used in aerospace?
(A) Heat treatment and precipitation hardening
(B) Increasing the density of the material
(C) Absorption of moisture
(D) Exposure to extreme temperatures

3. Which of the following is a commonly used composite material in aerospace structures?
(A) Titanium carbide
(B) Carbon fiber reinforced polymer (CFRP)
(C) Cast iron
(D) Stainless steel

4. What is the primary reason aluminum alloys are widely used in aerospace structures?
(A) High weight and low corrosion resistance
(B) Low strength and easy machinability
(C) Lightweight, high strength, and good corrosion resistance
(D) High density and high conductivity

5. What is the main disadvantage of composite materials in aerospace applications?
(A) High electrical conductivity
(B) Susceptibility to corrosion
(C) Difficulty in inspection and repair
(D) High weight compared to metals

6. Which type of aluminum alloy is most commonly used in aircraft structures?
(A) 1xxx series (Pure Aluminum)
(B) 2xxx series (Al-Cu alloys)
(C) 3xxx series (Al-Mn alloys)
(D) 5xxx series (Al-Mg alloys)

7. What property makes titanium alloys valuable in aerospace applications?
(A) Low melting point and high corrosion resistance
(B) High strength, corrosion resistance, and temperature resistance
(C) High weight and excellent conductivity
(D) Low strength but easy to manufacture

8. Which of the following is NOT an advantage of using composite materials in aerospace?
(A) High fatigue resistance
(B) Low thermal expansion
(C) Easy to manufacture and repair
(D) High strength-to-weight ratio

9. What is the role of a matrix in a composite material?
(A) Provides electrical conductivity
(B) Binds the reinforcement fibers and transfers load
(C) Acts as a heat sink for thermal management
(D) Increases the density of the composite

10. Which modern aerospace material is used in hypersonic vehicles for thermal protection?
(A) Aluminum-lithium alloys
(B) Ceramic matrix composites (CMCs)
(C) Magnesium alloys
(D) Stainless steel