Engineering Materials
Addition of silicon to aluminium results in

Improving machinability
One of the best known age and precipitation hardening systems
Improvement of corrosion resistance
Improvement of casting characteristics

ANSWER DOWNLOAD EXAMIANS APP

Engineering Materials
In spheroidising process, the steel is

Heated up to the lower critical temperature and then cooled in still air
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
None of these

ANSWER DOWNLOAD EXAMIANS APP

Engineering Materials
Nickel in steel

Gives ductility, toughness, tensile strength and anti-corrosion properties
Improves cutting ability and reduces hardenability
Improves wear resistance, cutting ability and toughness
Refines grain size and produces less tendency to carburisation, improves corrosion and heat resistant properties

ANSWER DOWNLOAD EXAMIANS APP