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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. Cast iron has

All of the above

Its elastic limit close to the ultimate breaking strength

High tensile strength

High ductility

2. The crystal structure of gamma iron is

Face centered cubic

Body centered cubic

Hexagonal close packed

Cubic structure

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

Nickel

Molybdenum

Cobalt

Vanadium

4. In induction hardening ________ is high.

Voltage

Frequency

Current

Temperature

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

Nodular aggregates of graphite

Free carbon

Cementite

Flakes

6. Which of the following is an amorphous material?

Mica

Silver

Lead

Glass

7. Chilled cast iron has

Graphite as its basic constituent of composition

No graphite

A low percentage of graphite

A very high percentage of graphite

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

All of the above

Hexagonal close packed lattice

Face centered cubic lattice

Body centered cubic lattice

9. Carbon steel is

Refined from cast iron

Extensively used for making cutting tools

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

Made by adding carbon in steel

10. The crystal of alpha iron is

Hexagonal close packed

Cubic structure

Face centered cubic

Body centered cubic

Page 2 of 4

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

Hardness

Yield point

Melting point

Critical temperature

12. When the steel is normalized, its

Ductility decreases

Yield point increases

Ultimate tensile strength increases

All of these

13. Malleable cast iron is produced

By quick cooling of molten cast iron

From white cast iron by annealing process

None of these

By adding magnesium to molten cast iron

14. Induction hardening is basically a

Carburising process

None of these

Surface hardening process

Core hardening process

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

Chromium

Copper

Nickel

Magnesium

16. The lower critical temperature

Decreases as the carbon content in steel increases

Increases as the carbon content in steel increases

Is same for all steels

Depends upon the rate of heating

17. Manganese is added in low carbon steel to

Make the steel tougher and harder

Raise the yield point

All of the above

Make the steel ductile and of good bending qualities

18. Pick up wrong statement about wrought iron

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

It melts at 1535°C

It contains carbon of the order of 0 to 0.25%

19. Monel metal is an alloy of

Nickel and copper

Nickel and chromium

Nickel, Chromium and iron

Copper and chromium

20. Grey cast iron has

Carbon in the form of free graphite

Low compressive strength

High tensile strength

All of these

Page 3 of 4

21. Sulphur in pig iron tends to make it

Ductile

Tough

Hard

Soft

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

0.8%

2%

0.2%

1.3%

23. In mottled cast iron, carbon is available in

Nodular form

Partly in free and partly in combined state

Combined form

Free form

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

Decreases

Increases

None of these

Does not effect

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

Carbon content

Ductility

Compressive strength

Hardness

26. Combined carbon in iron makes the metal

Soft and gives a fine grained crystalline structure

Hard and gives a fine grained crystalline structure

Soft and gives coarse grained crystalline structure

Hard and gives a coarse grained crystalline structure

27. Gamma iron exits at following temperature

Between 910°C and 1400°C

Near melting point

Room temperature

Between 1400°C and 1539°C

28. 'Killed steels' are those steels

Which are deoxidized in the ladle with silicon and aluminium

Which after their destruction are recycled to produce fresh steel

Which are destroyed by burning

In which carbon is completely burnt

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

Internal stresses are relieved

Steels are heated to 500 to 700°C

Cooling is done slowly and steadily

All of these

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

Cementite

Free carbon

Flakes

Spheroids

Page 4 of 4

31. The unique property of cast iron is its high

Ductility

Damping characteristics

Malleability

Surface finish

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

Free carbon

Cementite

Spheroids

Flakes

33. Paramagnetic alpha iron changes to gamma iron at

910°C

1440°C

1539°C

770°C

34. Iron is

Ferroelectric

Dielectric

Paramagnetic

Ferromagnetic

35. The purpose of heat treatment is to

Change grain size

Any one of these

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

Modify the structure of the material

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

Silicon bronze

White metal

Phosphor bronze

Monel metal

37. Steel containing ferrite and pearlite is

Hard

Hard and tough

Soft

Tough

38. Annealing of white cast iron results in production of

Malleable iron

Spheroidal iron

Nodular iron

Grey iron

39. Pure iron is the structure of

Pearlite

Ferrite

Austenite

Ferrite and cementite

40. Wrought iron is

Highly resistant to corrosion

Hard

Heat treated to change its properties

High in strength

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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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