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Engineering Materials
0

Engineering Materials Practice Set-6

May 13, 2021

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Page 1 of 4

1. The lower critical temperature

Increases as the carbon content in steel increases

Decreases as the carbon content in steel increases

Depends upon the rate of heating

Is same for all steels

2. Steel containing ferrite and pearlite is

Soft

Tough

Hard and tough

Hard

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

Carbon content

Hardness

Compressive strength

Ductility

4. Which of the following is an amorphous material?

Glass

Lead

Mica

Silver

5. Paramagnetic alpha iron changes to gamma iron at

1539°C

1440°C

770°C

910°C

6. Wrought iron is

High in strength

Highly resistant to corrosion

Heat treated to change its properties

Hard

7. Carbon steel is

Refined from cast iron

Made by adding carbon in steel

Extensively used for making cutting tools

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

8. Monel metal is an alloy of

Nickel, Chromium and iron

Nickel and chromium

Nickel and copper

Copper and chromium

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

Flakes

Spheroids

Free carbon

Cementite

10. In mottled cast iron, carbon is available in

Free form

Combined form

Nodular form

Partly in free and partly in combined state

Page 2 of 4

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

Melting point

Critical temperature

Yield point

Hardness

12. In induction hardening ________ is high.

Temperature

Voltage

Frequency

Current

13. Pure iron is the structure of

Pearlite

Ferrite and cementite

Ferrite

Austenite

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

Flakes

Spheroids

Free carbon

Cementite

15. Malleable cast iron is produced

By adding magnesium to molten cast iron

From white cast iron by annealing process

By quick cooling of molten cast iron

None of these

16. The crystal of alpha iron is

Hexagonal close packed

Cubic structure

Body centered cubic

Face centered cubic

17. Combined carbon in iron makes the metal

Soft and gives a fine grained crystalline structure

Hard and gives a coarse grained crystalline structure

Hard and gives a fine grained crystalline structure

Soft and gives coarse grained crystalline structure

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

Hexagonal close packed lattice

Body centered cubic lattice

Face centered cubic lattice

All of the above

19. When the steel is normalized, its

All of these

Ultimate tensile strength increases

Yield point increases

Ductility decreases

20. Annealing of white cast iron results in production of

Malleable iron

Grey iron

Nodular iron

Spheroidal iron

Page 3 of 4

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

Chromium

Magnesium

Copper

Nickel

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

0.8%

0.2%

2%

1.3%

23. Induction hardening is basically a

None of these

Carburising process

Surface hardening process

Core hardening process

24. Grey cast iron has

Low compressive strength

Carbon in the form of free graphite

All of these

High tensile strength

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

Vanadium

Cobalt

Nickel

Molybdenum

26. Sulphur in pig iron tends to make it

Ductile

Tough

Hard

Soft

27. Iron is

Ferroelectric

Paramagnetic

Dielectric

Ferromagnetic

28. Chilled cast iron has

Graphite as its basic constituent of composition

A very high percentage of graphite

A low percentage of graphite

No graphite

29. Cast iron has

Its elastic limit close to the ultimate breaking strength

High ductility

High tensile strength

All of the above

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

White metal

Silicon bronze

Phosphor bronze

Monel metal

Page 4 of 4

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

Free carbon

Nodular aggregates of graphite

Flakes

Cementite

32. 'Killed steels' are those steels

Which are destroyed by burning

Which after their destruction are recycled to produce fresh steel

Which are deoxidized in the ladle with silicon and aluminium

In which carbon is completely burnt

33. The crystal structure of gamma iron is

Body centered cubic

Cubic structure

Hexagonal close packed

Face centered cubic

34. The unique property of cast iron is its high

Surface finish

Damping characteristics

Malleability

Ductility

35. Gamma iron exits at following temperature

Between 910°C and 1400°C

Near melting point

Room temperature

Between 1400°C and 1539°C

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

All of these

Internal stresses are relieved

Cooling is done slowly and steadily

Steels are heated to 500 to 700°C

37. 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 contains carbon of the order of 0 to 0.25%

It melts at 1535°C

38. The purpose of heat treatment is to

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

Change grain size

Any one of these

Modify the structure of the material

39. Manganese is added in low carbon steel to

All of the above

Make the steel tougher and harder

Make the steel ductile and of good bending qualities

Raise the yield point

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

None of these

Does not effect

Decreases

Increases

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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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