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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

Nodular aggregates of graphite

Flakes

Free carbon

Cementite

2. Monel metal is an alloy of

Nickel and copper

Nickel and chromium

Nickel, Chromium and iron

Copper and chromium

3. In mottled cast iron, carbon is available in

Nodular form

Combined form

Partly in free and partly in combined state

Free form

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

Internal stresses are relieved

All of these

Cooling is done slowly and steadily

Steels are heated to 500 to 700°C

5. The crystal of alpha iron is

Cubic structure

Body centered cubic

Hexagonal close packed

Face centered cubic

6. Pure iron is the structure of

Austenite

Ferrite

Ferrite and cementite

Pearlite

7. Iron is

Ferroelectric

Ferromagnetic

Dielectric

Paramagnetic

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

Silicon bronze

Monel metal

White metal

Phosphor bronze

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

Hardness

Melting point

Critical temperature

Yield point

10. 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

Page 2 of 4

11. Chilled cast iron has

No graphite

Graphite as its basic constituent of composition

A very high percentage of graphite

A low percentage of graphite

12. Gamma iron exits at following temperature

Between 1400°C and 1539°C

Near melting point

Between 910°C and 1400°C

Room temperature

13. Annealing of white cast iron results in production of

Malleable iron

Spheroidal iron

Nodular iron

Grey iron

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

0.8%

0.2%

2%

1.3%

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

Ductility

Carbon content

Compressive strength

Hardness

16. The lower critical temperature

Depends upon the rate of heating

Is same for all steels

Decreases as the carbon content in steel increases

Increases as the carbon content in steel increases

17. The unique property of cast iron is its high

Ductility

Malleability

Damping characteristics

Surface finish

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

Cementite

Flakes

Spheroids

Free carbon

19. Malleable cast iron is produced

By adding magnesium to molten cast iron

By quick cooling of molten cast iron

None of these

From white cast iron by annealing process

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

Free carbon

Spheroids

Flakes

Cementite

Page 3 of 4

21. Wrought iron is

Hard

High in strength

Heat treated to change its properties

Highly resistant to corrosion

22. Induction hardening is basically a

Surface hardening process

Carburising process

Core hardening process

None of these

23. Sulphur in pig iron tends to make it

Tough

Hard

Ductile

Soft

24. When the steel is normalized, its

Yield point increases

Ductility decreases

All of these

Ultimate tensile strength increases

25. 'Killed steels' are those steels

In which carbon is completely burnt

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

26. Grey cast iron has

Carbon in the form of free graphite

All of these

High tensile strength

Low compressive strength

27. Manganese is added in low carbon steel to

All of the above

Raise the yield point

Make the steel ductile and of good bending qualities

Make the steel tougher and harder

28. The purpose of heat treatment is to

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

Change grain size

Modify the structure of the material

Any one of these

29. Paramagnetic alpha iron changes to gamma iron at

910°C

1440°C

770°C

1539°C

30. Which of the following is an amorphous material?

Mica

Glass

Silver

Lead

Page 4 of 4

31. Cast iron has

High tensile strength

All of the above

High ductility

Its elastic limit close to the ultimate breaking strength

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

All of the above

Hexagonal close packed lattice

Body centered cubic lattice

Face centered cubic lattice

33. Carbon steel is

Made by adding carbon in steel

Extensively used for making cutting tools

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

Refined from cast iron

34. Combined carbon in iron makes the metal

Soft and gives coarse grained crystalline structure

Hard and gives a fine grained crystalline structure

Soft and gives a fine grained crystalline structure

Hard and gives a coarse grained crystalline structure

35. In induction hardening ________ is high.

Voltage

Temperature

Current

Frequency

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

Magnesium

Chromium

Nickel

Copper

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

Nickel

Molybdenum

Vanadium

Cobalt

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

Does not effect

Decreases

None of these

Increases

39. The crystal structure of gamma iron is

Cubic structure

Hexagonal close packed

Face centered cubic

Body centered cubic

40. Steel containing ferrite and pearlite is

Tough

Soft

Hard

Hard and tough

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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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