Engineering Materials MCQs

Question 1

A reversible change in the atomic structure of the steel with a corresponding change in the properties is known as

Accepted Answer

Allotropic change

Answer

Recrystallization

Answer

Heat treatment

Answer

Precipitation

Question 2

A reversible change in the atomic structure of steel with corresponding change in the properties is known as

Accepted Answer

Allotropic change

Answer

Molecular change

Answer

Physical change

Answer

Solidus change

Question 3

Hardness of martensite is about

Accepted Answer

RC 65

Answer

RC 48

Answer

RC 57

Answer

RC 80

Question 4

A coarse grained steel

Accepted Answer

Is less tough and has a greater tendency to distort during heat treatment

Answer

Is more ductile and has a less tendency to distort during heat treatment

Answer

Is less tough and has a less tendency to distort during heat treatment

Answer

Is more ductile and has a greater tendency to distort during heat treatment

Question 5

Which of the following pipes is least corrosion resistant?

Accepted Answer

Wrought iron

Answer

Brass

Answer

Mild steel

Answer

Cast iron

Question 6

Points of arrest for iron correspond to

Accepted Answer

Stages at which allotropic forms change

Answer

Stages at which further heating does not increase temperature for some time

Answer

Stages at which properties do not change with increase in temperature

Answer

There is nothing like points of arrest

Question 7

The charge is fed into the blast furnace through the

Accepted Answer

Throat

Answer

Stack

Answer

Bosh

Answer

Tyres

Question 8

The charge of the blast furnace consists of

Accepted Answer

Calcined ore (8 parts), coke (4 parts) and limestone (1 part)

Answer

Calcined ore (4 parts), coke (1 part) and limestone (8 parts)

Answer

Calcined ore (1 part), coke (8 parts) and limestone (4 parts)

Answer

Calcined ore, coke and limestone all in equal parts

Question 9

Pearlite consists of

Accepted Answer

13% cementite and 87% ferrite

Answer

13% carbon and 87% ferrite

Answer

13% ferrite and 87% cementite

Answer

6.67% carbon and 93.33% iron