Engineering Materials MCQs

Question 1

Compressive strength of grey cast iron in tonnes/cm is of the order of

Accepted Answer

57

Answer

35

Answer

710

Answer

1015

Question 2

Y-alloy contains

Accepted Answer

3.5 to 4.5% copper, 1.2 to 1.7% manganese, 1.8 to 2.3% nickel, 0.6% each of silicon, magnesium and iron, and rest aluminium

Answer

3.5 to 4.5% copper, 0.4 to 0.7% magnesium, 0.4 to 0.7% manganese and rest aluminium

Answer

4 to 4.5% magnesium, 3 to 4% copper and rest aluminium

Answer

5 to 6% tin, 2 to 3% copper and rest aluminium

Question 3

Wrought iron

Accepted Answer

All of these

Answer

Is a ductile material

Answer

Can be easily forged or welded

Answer

Cannot stand sudden and excessive shocks

Question 4

White cast iron

Accepted Answer

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

Answer

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

Answer

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

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

Question 5

When the steel is normalized, its

Accepted Answer

All of these

Answer

Yield point increases

Answer

Ductility decreases

Answer

Ultimate tensile strength increases

Question 6

Amorphous material is one

Accepted Answer

In which there is no definite atomic structure and atoms exist in a random pattern just as in a liquid

Answer

In which atoms align themselves in a geometric pattern upon solidification

Answer

Which is not attacked by phosphorous

Answer

Which emits fumes on melting

Question 7

Cast iron is manufactured in

Accepted Answer

Cupola

Answer

Blast furnace

Answer

Open hearth furnace

Answer

Bessemer converter

Question 8

The molecules in a solid move

Accepted Answer

Back and forth like tiny pendulums

Answer

In a random manner

Answer

In a haphazard way

Answer

In circular motion

Question 9

Hardness of upper bainite (acicular structure) is about

Accepted Answer

RC 48

Answer

RC 65

Answer

RC 57

Answer

RC 80