Engineering Materials Mcqs

This set of Mechanical engineering Multiple Choice Questions & Answers (MCQs) focuses on study of “ Engineering Materials ”. These questions are chosen from a collection of most authoritative and best reference books on Mechanical engineering. Our aim is to prepare an individual for competitive exams like NTS, GAT, ECAT, University and College entrance exams, Jobs and interviews. One should practice our MCQS to assimilate Engineering Materials comprehensively.

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1.
Ferromagnetic alpha iron exists in temperature range of________________?

Below 723°C

770 – 910°C

910-1440°C

1400-1539°C

2.
A reversible change in the atomic structure of steel with corresponding change in the properties is known as___________________?

Molecular change

Physical change

Allotropic change

Solidus change

3.
The crystal of alpha iron is ____________________?

Body centred cubic

Face centred cubic

Hexagonal close packed

Cubic structure

4.
For the allotropic forms of iron, the points of arrest are __________________?

The points where no further change oc-curs

Constant for all metals

The points where there is no further flow of metal

The points of discontinuity

5.
The percentage of carbon in grey iron castings usually varies between __________________?

0.5 to 1%

1 – 2%

2.5 to 4.5%

5 – 7%

6.
The unique property of cast iron is its high ___________________?

Malleability

Ductility

Surface finish

Damping characteristics

7.
In grey cast iron, carbon is present in the form of____________________?

Cementite

Free carbon

Flakes

Spheroids

8.
In malleable iron, carbon is present in the form of___________________?

Cementite

Free carbon

Flakes

Spheroids

Nodular aggregates of graphite

9.
The following types of materials are usually the most ductile__________________?

Face-centred cubic lattice

Body-centred cubic lattice

Hexagonal close-packed lattice

All of the above

12.
Chilled cast iron has____________________?

No graphite

A very high percentage of graphite

A low percentage of graphite

Graphite as its basic constituent of composition

13.
White cast iron contains carbon in the form of__________________?

Free carbon

Graphite

Cementite

White carbon

14.
An important property of high silicon (12 – 18%) cast iron is the high__________________?

Tenacity

Brittleness

Plasticity

Corrosion resistance

Hardness

15.
Steel contains____________________?

80% or more iron

50% or more iron

Alloying elements like chromium, tungsten nickel and copper

Elements like phosphorus, sulphur and silicon in varying quantities

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