Engineering Materials MCQs

Question 1

A material is known as allotropic or polymorphic if it

Accepted Answer

Exists in several crystal forms at different temperatures

Answer

Has a fixed structure under all conditions

Answer

Responds to heat treatment

Answer

Has its atoms distributed in a random pattern

Question 2

Sulphur in cast iron

Accepted Answer

Increases hardness and brittleness

Answer

Makes the iron soft and easily machinable

Answer

Make the iron white and hard

Answer

Aids fusibility and fluidity

Question 3

An example of amorphous material is

Accepted Answer

Glass

Answer

Zinc

Answer

Lead

Answer

Silver

Question 4

Steel made from phosphate iron is

Accepted Answer

Brittle

Answer

Hard

Answer

Ductile

Answer

Tough

Question 5

The alloying element which reduces the formation of iron sulphide in steel is

Accepted Answer

Manganese

Answer

Chromium

Answer

Nickel

Answer

Vanadium

Question 6

In low carbon steels, ________ raises the yield point and improves the resistance to atmospheric corrosion.

Accepted Answer

Phosphorus

Answer

Sulphur

Answer

Manganese

Answer

Silicon

Question 7

Permalloy is a

Accepted Answer

Nickel and iron alloy having high permeability

Answer

Kind of stainless steel

Answer

None ferrous alloy

Answer

Polymer

Question 8

Process of Austempering results in

Accepted Answer

Formation of bainite structure

Answer

Carburised structure

Answer

Martenistic structure

Answer

Lamellar layers of carbide distributed throughout the structure

Question 9

Which is false statement about tempering? Tempering is done to

Accepted Answer

Improve machinability

Answer

Improve ductility

Answer

Improve toughness

Answer

Release stresses