Aluminium & its Alloys Quiz

Which element is alloyed with aluminium to create Duralumin?

• Copper

• Magnesium

• Zinc

• Silicon

Why is pure aluminium unsuitable for aircraft structural members?

• It is too expensive

• It is too soft and lacks strength

• It is too brittle

• It is too heavy

How are wrought aluminium alloys identified?

• By a four-digit number

• By a letter code

• By a three-digit number

• By a color code

What is the effect of adding magnesium to aluminium?

• Decreases strength and increases weight

• Increases melting point and decreases ductility

• Decreases weight and increases brittleness

• Increases tensile strength and corrosion resistance

What is a disadvantage of 7XXX series aluminium alloys?

• Low electrical conductivity

• Stress corrosion cracking

• Poor machinability

• High density

Which property of aluminium makes it a good choice for aircraft skin?

• High brittleness

• Excellent corrosion resistance

• Low melting point

• High density

What is the advantage of Alclad over sheet aluminium alloy?

• Better color

• Lower cost

• Higher weight

• Increased corrosion resistance

Which series of aluminium alloys is known for better fatigue performance?

• 2XXX series

• 3XXX series

• 6XXX series

• 5XXX series

What is the primary benefit of adding silicon to aluminium?

• Increases brittleness

• Decreases corrosion resistance

• Increases weight

• Reduces melting point

Which element, when alloyed with aluminium, increases its stiffness but also makes it more brittle?

• Zinc

• Copper

• Magnesium

• Silicon