Engineering Materials MCQs

Question 1

When a steel containing __________ 0.8% carbon is cooled slowly below the lower critical point, it consists of ferrite and pearlite.

Accepted Answer

Less than

Answer

Equal to

Answer

More than

Answer

None of these

Question 2

The ratio of the volume occupied by the atoms to the total volume of the unit cell is called

Accepted Answer

Atomic packing factor

Answer

Coordination number

Answer

Space lattice

Answer

None of these

Question 3

Smelting is the process of

Accepted Answer

Reducing the ore with carbon in the presence of a flux

Answer

Removing the impurities like clay, sand etc. from the iron ore by washing with water

Answer

Expelling moisture, carbon dioxide, sulphur and arsenic from the iron ore by heating in shallow kilns

Answer

All of the above

Question 4

Induction hardening is the process of

Accepted Answer

Hardening surface of work-piece to obtain hard and wear resistant surface

Answer

Heating and cooling rapidly

Answer

Increasing hardness throughout

Answer

Inducing hardness by continuous process

Question 5

Cyaniding is the process of

Accepted Answer

Adding carbon and nitrogen by heat treatment of steel to increase its surface hardness

Answer

Dipping steel in cyanide bath

Answer

Reacting steel surface with cyanide salts

Answer

Obtaining cyanide salts

Question 6

Stress relaxation is the phenomenon

Accepted Answer

In which deformation tends to loosen the joint and produces a stress reduced

Answer

In which parts are not loaded

Answer

In which stress remains constant on increasing load

Answer

Stress reduces on increasing load

Question 7

In nodular iron, graphite is in the form of

Accepted Answer

Spheroids

Answer

Cementite

Answer

Free carbon

Answer

Flakes

Question 8

When elements like nickel, chromium, copper and molybdenum are added to the molten cast iron, it produces

Accepted Answer

Alloy cast iron

Answer

White cast iron

Answer

Nodular cast iron

Answer

Malleable cast iron

Question 9

Iron is

Accepted Answer

Ferromagnetic

Answer

Paramagnetic

Answer

Ferroelectric

Answer

Dielectric