Engineering Materials MCQs

Question 1

Cold rolled steel sheets contain carbon of the following order

Accepted Answer

0.1%

Answer

0.2%

Answer

0.4%

Answer

0.6%

Question 2

In full annealing, the hypo eutectoid steel is heated from 30°C to 50°C above the upper critical temperature and then cooled

Accepted Answer

Slowly in the furnace

Answer

In still air

Answer

Suddenly in a suitable cooling medium

Answer

Any one of these

Question 3

Steel containing ferrite and pearlite is

Accepted Answer

Soft

Answer

Hard

Answer

Tough

Answer

Hard and tough

Question 4

Ductile cast iron

Accepted Answer

Is produced by small additions of magnesium (or creium) in the ladle. Graphite is in nodular or spheroidal form and is well dispersed throughout the material

Answer

Contains 1.7 to 3.5% carbon in Free State and is obtained by the slow cooling of molten cast iron

Answer

Is also known as chilled cast iron and is obtained by cooling rapidly. It is almost unmachinable

Answer

Is produced by annealing process. It is soft, tough and easily machined metal

Question 5

Which of the following steel making process is being adopted at Rourkela (in India) Steel Plant?

Accepted Answer

LD process

Answer

Bessemer process

Answer

Open hearth process

Answer

Electric process

Question 6

Quenching is not necessary when hardening is done by

Accepted Answer

Nitriding

Answer

Case hardening

Answer

Flame hardening

Answer

Any one of these

Question 7

Which is false statement about case hardening? Case hardening is done by

Accepted Answer

Electroplating

Answer

Cyaniding

Answer

Induction hardening

Answer

Nitriding

Question 8

The machinability of aluminium increases when _________ is added to aluminium.

Accepted Answer

Lead and bismuth

Answer

Copper

Answer

Magnesium

Answer

Silicon

Question 9

In high speed steels, manganese is used to tougher the metal and to increase its

Accepted Answer

Critical temperature

Answer

Yield point

Answer

Melting point

Answer

Hardness