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

Chromium

Nickel

Copper

Magnesium

2. When the steel is normalized, its

Ultimate tensile strength increases

Yield point increases

All of these

Ductility decreases

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

Body centered cubic lattice

Face centered cubic lattice

Hexagonal close packed lattice

All of the above

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

Nickel

Molybdenum

Cobalt

Vanadium

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

Critical temperature

Yield point

Melting point

Hardness

6. Wrought iron is

High in strength

Heat treated to change its properties

Highly resistant to corrosion

Hard

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

All of these

Cooling is done slowly and steadily

Internal stresses are relieved

Steels are heated to 500 to 700°C

8. The unique property of cast iron is its high

Malleability

Ductility

Surface finish

Damping characteristics

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

Flakes

Nodular aggregates of graphite

Free carbon

Cementite

10. 'Killed steels' are those steels

Which after their destruction are recycled to produce fresh steel

Which are destroyed by burning

Which are deoxidized in the ladle with silicon and aluminium

In which carbon is completely burnt

Page 2 of 4

11. Gamma iron exits at following temperature

Between 910°C and 1400°C

Between 1400°C and 1539°C

Near melting point

Room temperature

12. Induction hardening is basically a

None of these

Carburising process

Surface hardening process

Core hardening process

13. Carbon steel is

Refined from cast iron

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

Extensively used for making cutting tools

Made by adding carbon in steel

14. Manganese is added in low carbon steel to

All of the above

Raise the yield point

Make the steel tougher and harder

Make the steel ductile and of good bending qualities

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

Free carbon

Flakes

Cementite

Spheroids

16. Annealing of white cast iron results in production of

Grey iron

Spheroidal iron

Malleable iron

Nodular iron

17. In induction hardening ________ is high.

Current

Frequency

Voltage

Temperature

18. Combined carbon in iron makes the metal

Soft and gives coarse grained crystalline structure

Soft and gives a fine grained crystalline structure

Hard and gives a coarse grained crystalline structure

Hard and gives a fine grained crystalline structure

19. The purpose of heat treatment is to

Change grain size

Modify the structure of the material

Any one of these

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

20. The crystal structure of gamma iron is

Body centered cubic

Face centered cubic

Hexagonal close packed

Cubic structure

Page 3 of 4

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

White metal

Phosphor bronze

Silicon bronze

Monel metal

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

Hardness

Ductility

Compressive strength

Carbon content

23. Grey cast iron has

Low compressive strength

All of these

Carbon in the form of free graphite

High tensile strength

24. Iron is

Ferroelectric

Paramagnetic

Ferromagnetic

Dielectric

25. Which of the following is an amorphous material?

Mica

Glass

Lead

Silver

26. The lower critical temperature

Decreases as the carbon content in steel increases

Is same for all steels

Depends upon the rate of heating

Increases as the carbon content in steel increases

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

Decreases

Does not effect

Increases

None of these

28. Malleable cast iron is produced

None of these

By quick cooling of molten cast iron

From white cast iron by annealing process

By adding magnesium to molten cast iron

29. Chilled cast iron has

A low percentage of graphite

Graphite as its basic constituent of composition

No graphite

A very high percentage of graphite

30. The crystal of alpha iron is

Cubic structure

Hexagonal close packed

Body centered cubic

Face centered cubic

Page 4 of 4

31. Paramagnetic alpha iron changes to gamma iron at

770°C

910°C

1440°C

1539°C

32. Cast iron has

High tensile strength

Its elastic limit close to the ultimate breaking strength

High ductility

All of the above

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

Spheroids

Cementite

Free carbon

Flakes

34. Sulphur in pig iron tends to make it

Tough

Hard

Ductile

Soft

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

0.8%

2%

1.3%

0.2%

36. Steel containing ferrite and pearlite is

Soft

Hard and tough

Hard

Tough

37. Pure iron is the structure of

Ferrite and cementite

Austenite

Pearlite

Ferrite

38. In mottled cast iron, carbon is available in

Free form

Partly in free and partly in combined state

Combined form

Nodular form

39. Monel metal is an alloy of

Nickel, Chromium and iron

Nickel and chromium

Nickel and copper

Copper and chromium

40. Pick up wrong statement about wrought iron

It contains carbon of the order of 0 to 0.25%

It is very soft and ductile

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

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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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