Shipbuilding material

1. Which material is most commonly used in ship hull construction due to availability and strength?

• a) Titanium

• b) Mild Steel (A36)

• c) Brass

• d) Ceramic

2. What is the primary purpose of adding alloying elements to steel?

• a) To increase weight

• b) To improve mechanical properties

• c) To reduce melting point

• d) To change colour

3. Stainless steel requires at least what percentage of chromium to resist corrosion?

• a) 5%

• b) 8%

• c) 12%

• d) 20%

4. Which type of stainless steel is known for its FCC structure and excellent corrosion resistance?

• a) Ferritic

• b) Martensitic

• c) Austenitic

• d) Tempered

5. Which cast iron type contains graphite flakes in its microstructure?

• a) White cast iron

• b) Gray cast iron

• c) Malleable iron

• d) Ductile iron

6. What is the main advantage of using aluminium in shipbuilding?

• a) Very high density

• b) Corrosion resistance and lightweight

• c) High cost and hardness

• d) Difficult to machine

7. Polymer materials are preferred in ship interiors mainly because they are:

• a) Heavy and brittle

• b) Conductive

• c) Lightweight and moldable

• d) Magnetic

8. Which of the following is a non-metallic material used in marine structures?

• a) Copper alloy

• b) Polymer composite

• c) Mild steel

• d) Cast iron

9. In composite materials, the matrix mainly functions to:

• a) Provide reinforcement strength

• b) Hold the reinforcement and transfer load

• c) Increase electrical conductivity

• d) Reduce cost only

10. Marine concrete is specially designed to resist which major environmental factor?

• a) Sunlight only

• b) Chloride attack from seawater

• c) Thermal shock only

• d) Magnetic fields