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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. Pick up wrong statement about wrought iron

It melts at 1535°C

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 is very soft and ductile

2. Manganese is added in low carbon steel to

Make the steel tougher and harder

Raise the yield point

All of the above

Make the steel ductile and of good bending qualities

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

None of these

Increases

Does not effect

Decreases

4. Annealing of white cast iron results in production of

Spheroidal iron

Grey iron

Nodular iron

Malleable iron

5. The crystal structure of gamma iron is

Face centered cubic

Hexagonal close packed

Body centered cubic

Cubic structure

6. In induction hardening ________ is high.

Frequency

Current

Voltage

Temperature

7. Which of the following is an amorphous material?

Silver

Mica

Glass

Lead

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

0.8%

2%

1.3%

0.2%

9. Gamma iron exits at following temperature

Between 910°C and 1400°C

Near melting point

Between 1400°C and 1539°C

Room temperature

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

Cementite

Free carbon

Flakes

Nodular aggregates of graphite

Page 2 of 4

11. Induction hardening is basically a

Surface hardening process

None of these

Core hardening process

Carburising process

12. Paramagnetic alpha iron changes to gamma iron at

910°C

1440°C

1539°C

770°C

13. Wrought iron is

High in strength

Heat treated to change its properties

Hard

Highly resistant to corrosion

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

All of the above

Body centered cubic lattice

Hexagonal close packed lattice

Face centered cubic lattice

15. Carbon steel is

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

Refined from cast iron

Made by adding carbon in steel

Extensively used for making cutting tools

16. When the steel is normalized, its

Ductility decreases

Yield point increases

All of these

Ultimate tensile strength increases

17. 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

18. Pure iron is the structure of

Ferrite and cementite

Ferrite

Austenite

Pearlite

19. Steel containing ferrite and pearlite is

Hard

Tough

Soft

Hard and tough

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

Cobalt

Vanadium

Molybdenum

Nickel

Page 3 of 4

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

Hardness

Compressive strength

Carbon content

Ductility

22. Cast iron has

Its elastic limit close to the ultimate breaking strength

High tensile strength

High ductility

All of the above

23. Grey cast iron has

All of these

Carbon in the form of free graphite

High tensile strength

Low compressive strength

24. Malleable cast iron is produced

By adding magnesium to molten cast iron

None of these

By quick cooling of molten cast iron

From white cast iron by annealing process

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

Flakes

Spheroids

Free carbon

Cementite

26. Monel metal is an alloy of

Nickel and chromium

Nickel and copper

Copper and chromium

Nickel, Chromium and iron

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

Yield point

Melting point

Hardness

Critical temperature

28. Chilled cast iron has

A low percentage of graphite

Graphite as its basic constituent of composition

A very high percentage of graphite

No graphite

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

Magnesium

Copper

Nickel

Chromium

30. 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

Page 4 of 4

31. Combined carbon in iron makes the metal

Soft and gives coarse grained crystalline structure

Hard and gives a coarse grained crystalline structure

Soft and gives a fine grained crystalline structure

Hard and gives a fine grained crystalline structure

32. Sulphur in pig iron tends to make it

Ductile

Tough

Hard

Soft

33. The crystal of alpha iron is

Face centered cubic

Cubic structure

Body centered cubic

Hexagonal close packed

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

Phosphor bronze

Silicon bronze

Monel metal

White metal

35. In mottled cast iron, carbon is available in

Combined form

Partly in free and partly in combined state

Free form

Nodular form

36. '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

37. The lower critical temperature

Increases as the carbon content in steel increases

Is same for all steels

Decreases as the carbon content in steel increases

Depends upon the rate of heating

38. Iron is

Ferromagnetic

Ferroelectric

Paramagnetic

Dielectric

39. The unique property of cast iron is its high

Malleability

Surface finish

Damping characteristics

Ductility

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

Cementite

Flakes

Spheroids

Free carbon

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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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