Engineering Materials
Steel contains

Alloying elements like chromium, tungsten nickel and copper
Elements like phosphorus, sulphur and silicon in varying quantities
50% or more iron
80% or more iron

ANSWER DOWNLOAD EXAMIANS APP

Engineering Materials
Aluminium bronze contains

10% aluminium and 90% copper
92.5% aluminium, 4% copper, 2% nickel, and 1.5% Mg
94% aluminium, 4% copper and 0.5% Mn, Mg, Si and Fe
90% magnesium and 9% aluminium with some copper

ANSWER DOWNLOAD EXAMIANS APP

Engineering Materials
Grey cast iron

Is also known as chilled cast iron is obtained by cooling rapidly. It is almost unmachinable
Contains 1.7 to 3.5% carbon in Free State and is obtained by the slow cooling of molten cast iron
Is produced by small additions o magnesium (or cerium) in the ladle Graphite is in nodular or spheroidal form and is well dispersed throughout the material
Is produced by annealing process. I is soft, tough and easily machined metal

ANSWER DOWNLOAD EXAMIANS APP

Engineering Materials
In process annealing, the hypo eutectoid steel is

Heated below or closes to the lower critical temperature and then cooled slowly
Heated from 30°C to 50°C above the upper critical temperature and then cooled suddenly in a suitable cooling medium
Heated from 30°C to 50°C above the upper critical temperature and then cooled slowly in the furnace
Heated from 30°C to 50°C above the upper critical temperature and then cooled in still air

ANSWER DOWNLOAD EXAMIANS APP
MORE MCQ ON Engineering Materials