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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. Wrought iron is

Hard

High in strength

Heat treated to change its properties

Highly resistant to corrosion

2. Grey cast iron has

High tensile strength

Carbon in the form of free graphite

All of these

Low compressive strength

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

Steels are heated to 500 to 700°C

Internal stresses are relieved

All of these

Cooling is done slowly and steadily

4. The unique property of cast iron is its high

Ductility

Malleability

Damping characteristics

Surface finish

5. Monel metal is an alloy of

Nickel and chromium

Copper and chromium

Nickel, Chromium and iron

Nickel and copper

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

Increases

Does not effect

None of these

Decreases

7. The purpose of heat treatment is to

Modify the structure of the material

Any one of these

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

Change grain size

8. Paramagnetic alpha iron changes to gamma iron at

1440°C

1539°C

910°C

770°C

9. Pure iron is the structure of

Ferrite

Pearlite

Ferrite and cementite

Austenite

10. Malleable cast iron is produced

By adding magnesium to molten cast iron

From white cast iron by annealing process

By quick cooling of molten cast iron

None of these

Page 2 of 4

11. Cast iron has

High ductility

High tensile strength

Its elastic limit close to the ultimate breaking strength

All of the above

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

Flakes

Free carbon

Spheroids

Cementite

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

Hexagonal close packed lattice

Face centered cubic lattice

Body centered cubic lattice

All of the above

14. In mottled cast iron, carbon is available in

Free form

Partly in free and partly in combined state

Combined form

Nodular form

15. In induction hardening ________ is high.

Frequency

Temperature

Voltage

Current

16. Sulphur in pig iron tends to make it

Ductile

Soft

Tough

Hard

17. The crystal of alpha iron is

Face centered cubic

Hexagonal close packed

Cubic structure

Body centered cubic

18. Manganese is added in low carbon steel to

Make the steel ductile and of good bending qualities

All of the above

Make the steel tougher and harder

Raise the yield point

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

Cobalt

Molybdenum

Vanadium

Nickel

20. Pick up wrong statement about wrought iron

It is very soft and ductile

It contains carbon of the order of 0 to 0.25%

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

It melts at 1535°C

Page 3 of 4

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

1.3%

2%

0.8%

0.2%

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

Hardness

Carbon content

Compressive strength

Ductility

23. Induction hardening is basically a

Carburising process

None of these

Core hardening process

Surface hardening process

24. The lower critical temperature

Is same for all steels

Increases as the carbon content in steel increases

Decreases as the carbon content in steel increases

Depends upon the rate of heating

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

Cementite

Nodular aggregates of graphite

Free carbon

Flakes

26. Carbon steel is

Extensively used for making cutting tools

Made by adding carbon in steel

Refined from cast iron

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

27. Iron is

Ferromagnetic

Paramagnetic

Ferroelectric

Dielectric

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

Hardness

Critical temperature

Yield point

Melting point

29. Annealing of white cast iron results in production of

Malleable iron

Nodular iron

Grey iron

Spheroidal iron

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

White metal

Monel metal

Phosphor bronze

Silicon bronze

Page 4 of 4

31. When the steel is normalized, its

Ductility decreases

Yield point increases

All of these

Ultimate tensile strength increases

32. 'Killed steels' are those steels

Which are destroyed by burning

Which are deoxidized in the ladle with silicon and aluminium

In which carbon is completely burnt

Which after their destruction are recycled to produce fresh steel

33. Chilled cast iron has

A very high percentage of graphite

Graphite as its basic constituent of composition

A low percentage of graphite

No graphite

34. Gamma iron exits at following temperature

Between 1400°C and 1539°C

Between 910°C and 1400°C

Room temperature

Near melting point

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

Flakes

Free carbon

Spheroids

Cementite

36. Combined carbon in iron makes the metal

Soft and gives a fine grained crystalline structure

Hard and gives a coarse grained crystalline structure

Soft and gives coarse grained crystalline structure

Hard and gives a fine grained crystalline structure

37. Steel containing ferrite and pearlite is

Soft

Hard and tough

Tough

Hard

38. The crystal structure of gamma iron is

Face centered cubic

Hexagonal close packed

Body centered cubic

Cubic structure

39. Which of the following is an amorphous material?

Mica

Silver

Lead

Glass

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

Nickel

Copper

Magnesium

Chromium

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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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