Which element, when alloyed with aluminium, increases its strength and hardness as it hardens with age?

• Copper

• Manganese

• Silicon

• Zinc

What is the primary reason pure aluminium is unsuitable for aircraft structural members?

• It is not corrosion resistant.

• It lacks strength and is too soft.

• It is too heavy.

• It is too expensive.

What is the density of aluminium compared to steel?

• 2.70g/cm3 for both aluminium and steel

• 7.87g/cm3 for both aluminium and steel

• 7.87g/cm3 for aluminium and 2.70g/cm3 for steel

• 2.70g/cm3 for aluminium and 7.87g/cm3 for steel

Which series of aluminium alloys is known for having better fatigue performance than the 7XXX series?

• 5XXX series

• 3XXX series

• 2XXX series

• 1XXX series

What is the main advantage of Alclad over sheet aluminium alloy?

• Lower cost

• Better electrical conductivity

• Higher strength

• Increased corrosion resistance

Which element, when alloyed with aluminium, provides a surface highly resistant to wear and corrosion?

• Copper

• Silicon

• Manganese

• Magnesium

What is the effect of adding zinc to aluminium?

• Increases ductility

• Decreases corrosion resistance

• Increases brittleness

• Decreases strength

Which aluminium alloy is known for its use in lightweight military bridges and aircraft?

• 7XXX series

• 3XXX series

• 2XXX series

• 5XXX series

What is the primary benefit of using aluminium alloys in aircraft?

• High cost

• High weight

• High strength-to-weight ratio

• Low thermal conductivity

Which element, when alloyed with aluminium, reduces the melting point making the alloy easier to cast?

• Copper

• Manganese

• Silicon

• Zinc