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Engineering Materials
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Engineering Materials Practice Set-6

May 13, 2021

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25%

Page 1 of 4

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

Increases

Decreases

Does not effect

None of these

2. Sulphur in pig iron tends to make it

Soft

Hard

Tough

Ductile

3. The unique property of cast iron is its high

Damping characteristics

Malleability

Ductility

Surface finish

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

Cementite

Spheroids

Flakes

Free carbon

5. The lower critical temperature

Is same for all steels

Increases as the carbon content in steel increases

Depends upon the rate of heating

Decreases as the carbon content in steel increases

6. Chilled cast iron has

A very high percentage of graphite

No graphite

A low percentage of graphite

Graphite as its basic constituent of composition

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

Molybdenum

Nickel

Vanadium

Cobalt

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

0.2%

2%

0.8%

1.3%

9. Gamma iron exits at following temperature

Between 1400°C and 1539°C

Between 910°C and 1400°C

Room temperature

Near melting point

10. Wrought iron is

Heat treated to change its properties

Hard

Highly resistant to corrosion

High in strength

Page 2 of 4

11. The crystal of alpha iron is

Body centered cubic

Cubic structure

Hexagonal close packed

Face centered cubic

12. Steel containing ferrite and pearlite is

Hard and tough

Hard

Soft

Tough

13. Paramagnetic alpha iron changes to gamma iron at

1440°C

910°C

770°C

1539°C

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

Steels are heated to 500 to 700°C

All of these

Cooling is done slowly and steadily

Internal stresses are relieved

15. Grey cast iron has

All of these

Low compressive strength

Carbon in the form of free graphite

High tensile strength

16. Cast iron has

High tensile strength

High ductility

Its elastic limit close to the ultimate breaking strength

All of the above

17. Combined carbon in iron makes the metal

Soft and gives a fine grained crystalline structure

Soft and gives coarse grained crystalline structure

Hard and gives a coarse grained crystalline structure

Hard and gives a fine grained crystalline structure

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

White metal

Monel metal

Phosphor bronze

Silicon bronze

19. Malleable cast iron is produced

From white cast iron by annealing process

None of these

By adding magnesium to molten cast iron

By quick cooling of molten cast iron

20. Iron is

Dielectric

Ferroelectric

Paramagnetic

Ferromagnetic

Page 3 of 4

21. Monel metal is an alloy of

Nickel and copper

Nickel, Chromium and iron

Copper and chromium

Nickel and chromium

22. 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 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

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

Flakes

Free carbon

Nodular aggregates of graphite

Cementite

24. In mottled cast iron, carbon is available in

Free form

Partly in free and partly in combined state

Nodular form

Combined form

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

Free carbon

Spheroids

Flakes

Cementite

26. Which of the following is an amorphous material?

Mica

Glass

Lead

Silver

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

Melting point

Critical temperature

Hardness

Yield point

28. Induction hardening is basically a

None of these

Surface hardening process

Core hardening process

Carburising process

29. Annealing of white cast iron results in production of

Spheroidal iron

Nodular iron

Malleable iron

Grey iron

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

Copper

Magnesium

Chromium

Nickel

Page 4 of 4

31. The crystal structure of gamma iron is

Face centered cubic

Cubic structure

Hexagonal close packed

Body centered cubic

32. The purpose of heat treatment is to

Any one of these

Modify the structure of the material

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

Change grain size

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

All of the above

Face centered cubic lattice

Body centered cubic lattice

Hexagonal close packed lattice

34. In induction hardening ________ is high.

Current

Frequency

Temperature

Voltage

35. Carbon steel is

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

Refined from cast iron

36. Pure iron is the structure of

Ferrite and cementite

Ferrite

Austenite

Pearlite

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

Ductility

Carbon content

Hardness

Compressive strength

38. 'Killed steels' are those steels

Which are destroyed by burning

Which after their destruction are recycled to produce fresh steel

In which carbon is completely burnt

Which are deoxidized in the ladle with silicon and aluminium

39. Manganese is added in low carbon steel to

All of the above

Make the steel ductile and of good bending qualities

Raise the yield point

Make the steel tougher and harder

40. When the steel is normalized, its

Ductility decreases

Yield point increases

Ultimate tensile strength increases

All of these

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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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