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Engineering Materials
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Engineering Materials Practice Set-6

May 13, 2021

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Page 1 of 4

1. The unique property of cast iron is its high

Damping characteristics

Malleability

Ductility

Surface finish

2. 'Killed steels' are those steels

Which are destroyed by burning

Which are deoxidized in the ladle with silicon and aluminium

Which after their destruction are recycled to produce fresh steel

In which carbon is completely burnt

3. Which of the following statements are true for annealing of steels?

Steels are heated to 500 to 700°C

All of these

Cooling is done slowly and steadily

Internal stresses are relieved

4. Pure iron is the structure of

Austenite

Ferrite

Ferrite and cementite

Pearlite

5. Grey cast iron has

Low compressive strength

High tensile strength

All of these

Carbon in the form of free graphite

6. Chilled cast iron has

No graphite

Graphite as its basic constituent of composition

A very high percentage of graphite

A low percentage of graphite

7. Chromium when added to steel _________ the tensile strength.

Increases

None of these

Decreases

Does not effect

8. In induction hardening ________ is high.

Voltage

Current

Frequency

Temperature

9. Wrought iron is

High in strength

Heat treated to change its properties

Highly resistant to corrosion

Hard

10. Cast iron is characterized by minimum of following percentage of carbon

2%

0.8%

1.3%

0.2%

Page 2 of 4

11. Combined carbon in iron makes the metal

Hard and gives a fine grained crystalline structure

Soft and gives a fine grained crystalline structure

Hard and gives a coarse grained crystalline structure

Soft and gives coarse grained crystalline structure

12. Cast iron has

High tensile strength

High ductility

All of the above

Its elastic limit close to the ultimate breaking strength

13. The metal suitable for bearings subjected to light loads, is

Silicon bronze

Phosphor bronze

White metal

Monel metal

14. Which of the following is an amorphous material?

Mica

Lead

Silver

Glass

15. In malleable iron, carbon is present in the form of

Free carbon

Flakes

Cementite

Nodular aggregates of graphite

16. Sulphur in pig iron tends to make it

Ductile

Hard

Tough

Soft

17. In nodular iron, graphite is in the form of

Free carbon

Cementite

Spheroids

Flakes

18. Monel metal is an alloy of

Nickel, Chromium and iron

Nickel and chromium

Copper and chromium

Nickel and copper

19. Annealing of white cast iron results in production of

Nodular iron

Spheroidal iron

Grey iron

Malleable iron

20. Iron is

Ferroelectric

Ferromagnetic

Dielectric

Paramagnetic

Page 3 of 4

21. Induction hardening is basically a

Surface hardening process

Core hardening process

None of these

Carburising process

22. Malleable cast iron is produced

From white cast iron by annealing process

By quick cooling of molten cast iron

By adding magnesium to molten cast iron

None of these

23. The alloying element which can replace tungsten in high speed steels is

Molybdenum

Vanadium

Nickel

Cobalt

24. Nodular cast iron is produced by adding ________ to the molten cast iron.

Copper

Nickel

Chromium

Magnesium

25. The crystal structure of gamma iron is

Face centered cubic

Hexagonal close packed

Cubic structure

Body centered cubic

26. Gamma iron exits at following temperature

Between 910°C and 1400°C

Near melting point

Between 1400°C and 1539°C

Room temperature

27. In mottled cast iron, carbon is available in

Nodular form

Free form

Combined form

Partly in free and partly in combined state

28. The purpose of heat treatment is to

Modify the structure of the material

Any one of these

Change grain size

Relieve the stresses set up in the material after hot or cold working

29. Steel containing ferrite and pearlite is

Tough

Soft

Hard and tough

Hard

30. An important property of malleable cast iron in comparison to grey cast iron is the high

Carbon content

Ductility

Hardness

Compressive strength

Page 4 of 4

31. In high speed steels, manganese is used to tougher the metal and to increase its

Yield point

Melting point

Critical temperature

Hardness

32. Manganese is added in low carbon steel to

Make the steel tougher and harder

Raise the yield point

Make the steel ductile and of good bending qualities

All of the above

33. In grey cast iron, carbon is present in the form of

Free carbon

Cementite

Flakes

Spheroids

34. The crystal of alpha iron is

Body centered cubic

Face centered cubic

Cubic structure

Hexagonal close packed

35. The following types of materials are usually the most ductile

Hexagonal close packed lattice

Body centered cubic lattice

All of the above

Face centered cubic lattice

36. Pick up wrong statement about wrought iron

It contains carbon of the order of 0 to 0.25%

It melts at 1535°C

It is made by adding suitable percentage of carbon to molten iron and subjecting the product to repeated hammering and rolling

It is very soft and ductile

37. Paramagnetic alpha iron changes to gamma iron at

1539°C

1440°C

910°C

770°C

38. Carbon steel is

Extensively used for making cutting tools

Made by adding carbon in steel

An alloy of iron and carbon with varying quantities of phosphorus and sulphur

Refined from cast iron

39. The lower critical temperature

Is same for all steels

Depends upon the rate of heating

Decreases as the carbon content in steel increases

Increases as the carbon content in steel increases

40. When the steel is normalized, its

All of these

Yield point increases

Ultimate tensile strength increases

Ductility decreases

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VideRime

A Demrot is the founder of VideRime Online Learning, a leading engineering website. He did his BE Civil and M.Tech Structure from RGPV University, Bhopal and has been working as an Assistant Professor in a reputed college.

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