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Engineering Materials
0

Engineering Materials Practice Set-6

May 13, 2021

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Page 1 of 4

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

Hardness

Compressive strength

Ductility

Carbon content

2. The lower critical temperature

Depends upon the rate of heating

Increases as the carbon content in steel increases

Is same for all steels

Decreases as the carbon content in steel increases

3. The crystal structure of gamma iron is

Hexagonal close packed

Body centered cubic

Cubic structure

Face centered cubic

4. '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

5. Carbon steel is

Refined from cast iron

Made by adding carbon in steel

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

Extensively used for making cutting tools

6. 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

7. Gamma iron exits at following temperature

Near melting point

Between 1400°C and 1539°C

Between 910°C and 1400°C

Room temperature

8. Iron is

Ferromagnetic

Dielectric

Ferroelectric

Paramagnetic

9. Which of the following is an amorphous material?

Glass

Lead

Mica

Silver

10. Monel metal is an alloy of

Copper and chromium

Nickel and chromium

Nickel and copper

Nickel, Chromium and iron

Page 2 of 4

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

Increases

Does not effect

None of these

Decreases

12. The purpose of heat treatment is to

Change grain size

Any one of these

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

Modify the structure of the material

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

Internal stresses are relieved

Cooling is done slowly and steadily

All of these

Steels are heated to 500 to 700°C

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

Flakes

Cementite

Free carbon

Nodular aggregates of graphite

15. Pure iron is the structure of

Pearlite

Ferrite

Ferrite and cementite

Austenite

16. Induction hardening is basically a

Carburising process

Surface hardening process

None of these

Core hardening process

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

Nickel

Vanadium

Molybdenum

Cobalt

18. The unique property of cast iron is its high

Surface finish

Damping characteristics

Malleability

Ductility

19. 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

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

Hardness

Critical temperature

Yield point

Melting point

Page 3 of 4

21. Wrought iron is

Highly resistant to corrosion

Hard

Heat treated to change its properties

High in strength

22. Paramagnetic alpha iron changes to gamma iron at

910°C

1440°C

770°C

1539°C

23. The crystal of alpha iron is

Face centered cubic

Hexagonal close packed

Body centered cubic

Cubic structure

24. In mottled cast iron, carbon is available in

Combined form

Nodular form

Free form

Partly in free and partly in combined state

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

White metal

Silicon bronze

Monel metal

Phosphor bronze

26. Steel containing ferrite and pearlite is

Hard and tough

Soft

Tough

Hard

27. When the steel is normalized, its

Yield point increases

All of these

Ductility decreases

Ultimate tensile strength increases

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

Cementite

Flakes

Free carbon

Spheroids

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

Flakes

Spheroids

Free carbon

Cementite

30. Sulphur in pig iron tends to make it

Tough

Soft

Hard

Ductile

Page 4 of 4

31. Cast iron has

High tensile strength

All of the above

Its elastic limit close to the ultimate breaking strength

High ductility

32. Chilled cast iron has

No graphite

A low percentage of graphite

A very high percentage of graphite

Graphite as its basic constituent of composition

33. In induction hardening ________ is high.

Temperature

Frequency

Voltage

Current

34. Malleable cast iron is produced

From white cast iron by annealing process

By quick cooling of molten cast iron

None of these

By adding magnesium to molten cast iron

35. Pick up wrong statement about wrought iron

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

It is very soft and ductile

It contains carbon of the order of 0 to 0.25%

36. Grey cast iron has

Carbon in the form of free graphite

High tensile strength

Low compressive strength

All of these

37. Annealing of white cast iron results in production of

Spheroidal iron

Grey iron

Nodular iron

Malleable iron

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

2%

0.2%

0.8%

1.3%

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

All of the above

Hexagonal close packed lattice

Body centered cubic lattice

Face centered cubic lattice

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

Chromium

Copper

Magnesium

Nickel

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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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