ENGINEERING MATERIALS QUIZ

High tensile strength

High machinability

All of these

Low melting point

Improves wear resistance, cutting ability and toughness

Improves cutting ability and reduces hardenability

Refines grain size and produces less tendency to carburisation, improves corrosion and heat resistant properties

Gives ductility, toughness, tensile strength and anti-corrosion properties

None of these

Heated below the lower critical temperature and then cooled slowly

Heated slightly above the lower critical temperature and then cooled slowly to a temperature of 600°C

Heated up to the lower critical temperature and then cooled in still air

Wrought iron

Cast iron

Steel

Pig iron

Ductility

Stiffness

Plasticity

Resilience

Invar

High speed steel

Heat resisting steel

Stainless steel

Cast iron

Brass

Aluminium

Steel

3.5 to 4.5% copper, 0.4 to 0.7% magnesium, 0.4 to 0.7% manganese and rest aluminium

5 to 6% tin, 2 to 3% copper and rest aluminium

3.5 to 4.5% copper, 1.2 to 1.7% manganese, 1.8 to 2.3% nickel, 0.6% each of silicon, magnesium and iron, and rest aluminium

4 to 4.5% magnesium, 3 to 4% copper and rest aluminium

In a haphazard way

Back and forth like tiny pendulums

In a random manner

In circular motion

Uniform in all directions

Perpendicular to lines of slag distribution

Along the lines of slag distribution

None of these