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

Flakes

Nodular aggregates of graphite

Cementite

Free carbon

2. Cast iron has

Its elastic limit close to the ultimate breaking strength

High ductility

All of the above

High tensile strength

3. In induction hardening ________ is high.

Temperature

Current

Voltage

Frequency

4. Gamma iron exits at following temperature

Room temperature

Near melting point

Between 910°C and 1400°C

Between 1400°C and 1539°C

5. Paramagnetic alpha iron changes to gamma iron at

770°C

910°C

1440°C

1539°C

6. The purpose of heat treatment is to

Any one of these

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

Modify the structure of the material

Change grain size

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

Flakes

Spheroids

Cementite

Free carbon

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

Face centered cubic lattice

All of the above

Hexagonal close packed lattice

Body centered cubic lattice

9. In mottled cast iron, carbon is available in

Nodular form

Free form

Partly in free and partly in combined state

Combined form

10. Grey cast iron has

Low compressive strength

Carbon in the form of free graphite

High tensile strength

All of these

Page 2 of 4

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

Ductility

Hardness

Compressive strength

Carbon content

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

Internal stresses are relieved

Cooling is done slowly and steadily

All of these

Steels are heated to 500 to 700°C

13. Steel containing ferrite and pearlite is

Soft

Hard and tough

Hard

Tough

14. Malleable cast iron is produced

From white cast iron by annealing process

By adding magnesium to molten cast iron

None of these

By quick cooling of molten cast iron

15. Manganese is added in low carbon steel to

Raise the yield point

Make the steel ductile and of good bending qualities

Make the steel tougher and harder

All of the above

16. Wrought iron is

Heat treated to change its properties

Highly resistant to corrosion

Hard

High in strength

17. The unique property of cast iron is its high

Ductility

Damping characteristics

Malleability

Surface finish

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

White metal

Monel metal

Phosphor bronze

Silicon bronze

19. The lower critical temperature

Depends upon the rate of heating

Increases as the carbon content in steel increases

Is same for all steels

Decreases as the carbon content in steel increases

20. Monel metal is an alloy of

Nickel and chromium

Copper and chromium

Nickel, Chromium and iron

Nickel and copper

Page 3 of 4

21. Induction hardening is basically a

Carburising process

Core hardening process

Surface hardening process

None of these

22. Combined carbon in iron makes the metal

Hard and gives a fine grained crystalline structure

Hard and gives a coarse grained crystalline structure

Soft and gives coarse grained crystalline structure

Soft and gives a fine grained crystalline structure

23. Which of the following is an amorphous material?

Silver

Glass

Lead

Mica

24. When the steel is normalized, its

Yield point increases

All of these

Ultimate tensile strength increases

Ductility decreases

25. Annealing of white cast iron results in production of

Malleable iron

Spheroidal iron

Grey iron

Nodular iron

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

Critical temperature

Melting point

Hardness

Yield point

27. Chilled cast iron has

A very high percentage of graphite

A low percentage of graphite

No graphite

Graphite as its basic constituent of composition

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

Molybdenum

Nickel

Cobalt

Vanadium

29. Carbon steel is

Made by adding carbon in steel

Extensively used for making cutting tools

Refined from cast iron

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

30. The crystal structure of gamma iron is

Hexagonal close packed

Face centered cubic

Body centered cubic

Cubic structure

Page 4 of 4

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

Chromium

Magnesium

Nickel

Copper

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

Does not effect

Decreases

Increases

None of these

33. Pick up wrong statement about wrought iron

It is very soft and ductile

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

It contains carbon of the order of 0 to 0.25%

It melts at 1535°C

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

Flakes

Cementite

Free carbon

Spheroids

35. The crystal of alpha iron is

Hexagonal close packed

Face centered cubic

Body centered cubic

Cubic structure

36. Sulphur in pig iron tends to make it

Tough

Hard

Soft

Ductile

37. 'Killed steels' are those steels

Which after their destruction are recycled to produce fresh steel

Which are destroyed by burning

In which carbon is completely burnt

Which are deoxidized in the ladle with silicon and aluminium

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

1.3%

0.8%

2%

0.2%

39. Iron is

Ferroelectric

Dielectric

Paramagnetic

Ferromagnetic

40. Pure iron is the structure of

Ferrite and cementite

Ferrite

Austenite

Pearlite

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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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