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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. Chromium when added to steel _________ the tensile strength.

Decreases

Does not effect

None of these

Increases

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

Cooling is done slowly and steadily

Steels are heated to 500 to 700°C

All of these

Internal stresses are relieved

3. 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

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

Carbon content

Hardness

Ductility

Compressive strength

5. The crystal structure of gamma iron is

Cubic structure

Body centered cubic

Hexagonal close packed

Face centered cubic

6. 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

7. 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

8. In induction hardening ________ is high.

Temperature

Voltage

Current

Frequency

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

Spheroids

Cementite

Free carbon

Flakes

10. 'Killed steels' are those steels

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

Which are destroyed by burning

Page 2 of 4

11. Pure iron is the structure of

Austenite

Ferrite and cementite

Ferrite

Pearlite

12. Gamma iron exits at following temperature

Between 910°C and 1400°C

Room temperature

Near melting point

Between 1400°C and 1539°C

13. The unique property of cast iron is its high

Damping characteristics

Surface finish

Malleability

Ductility

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

0.2%

2%

1.3%

0.8%

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

Magnesium

Chromium

Copper

Nickel

16. Cast iron has

High tensile strength

All of the above

High ductility

Its elastic limit close to the ultimate breaking strength

17. Paramagnetic alpha iron changes to gamma iron at

910°C

1440°C

1539°C

770°C

18. Chilled cast iron has

A low percentage of graphite

A very high percentage of graphite

Graphite as its basic constituent of composition

No graphite

19. Which of the following is an amorphous material?

Mica

Glass

Silver

Lead

20. The lower critical temperature

Is same for all steels

Depends upon the rate of heating

Decreases as the carbon content in steel increases

Increases as the carbon content in steel increases

Page 3 of 4

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

Nickel

Cobalt

Vanadium

Molybdenum

22. Manganese is added in low carbon steel to

Make the steel ductile and of good bending qualities

Raise the yield point

Make the steel tougher and harder

All of the above

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

Spheroids

Flakes

Cementite

Free carbon

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

White metal

Silicon bronze

Monel metal

Phosphor bronze

25. When the steel is normalized, its

Ductility decreases

All of these

Ultimate tensile strength increases

Yield point increases

26. Iron is

Ferromagnetic

Dielectric

Paramagnetic

Ferroelectric

27. The crystal of alpha iron is

Face centered cubic

Hexagonal close packed

Cubic structure

Body centered cubic

28. In mottled cast iron, carbon is available in

Nodular form

Combined form

Partly in free and partly in combined state

Free form

29. Wrought iron is

Hard

Heat treated to change its properties

High in strength

Highly resistant to corrosion

30. Malleable cast iron is produced

None of these

By adding magnesium to molten cast iron

By quick cooling of molten cast iron

From white cast iron by annealing process

Page 4 of 4

31. Steel containing ferrite and pearlite is

Soft

Hard

Hard and tough

Tough

32. Sulphur in pig iron tends to make it

Ductile

Hard

Tough

Soft

33. Grey cast iron has

High tensile strength

All of these

Low compressive strength

Carbon in the form of free graphite

34. Induction hardening is basically a

None of these

Surface hardening process

Core hardening process

Carburising process

35. 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%

36. The purpose of heat treatment is to

Change grain size

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

Modify the structure of the material

Any one of these

37. Monel metal is an alloy of

Nickel and copper

Copper and chromium

Nickel, Chromium and iron

Nickel and chromium

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

Flakes

Cementite

Free carbon

Nodular aggregates of graphite

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

Yield point

Hardness

Critical temperature

Melting point

40. Annealing of white cast iron results in production of

Spheroidal iron

Nodular iron

Malleable iron

Grey iron

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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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