Engineering Materials Practice Set-6

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

Compressive strength

Ductility

Carbon content

Hardness

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

Body centered cubic lattice

Face centered cubic lattice

Hexagonal close packed lattice

All of the above

3. Pure iron is the structure of

Ferrite

Pearlite

Ferrite and cementite

Austenite

4. Sulphur in pig iron tends to make it

Ductile

Tough

Hard

Soft

5. Wrought iron is

Heat treated to change its properties

Hard

Highly resistant to corrosion

High in strength

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

Vanadium

Cobalt

Nickel

Molybdenum

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

Phosphor bronze

White metal

Silicon bronze

Monel metal

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

Nodular aggregates of graphite

Flakes

Cementite

Free carbon

9. The unique property of cast iron is its high

Damping characteristics

Malleability

Surface finish

Ductility

10. Iron is

Ferromagnetic

Dielectric

Paramagnetic

Ferroelectric

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11. The crystal of alpha iron is

Hexagonal close packed

Face centered cubic

Cubic structure

Body centered cubic

12. Chilled cast iron has

No graphite

A very high percentage of graphite

Graphite as its basic constituent of composition

A low percentage of graphite

13. Gamma iron exits at following temperature

Between 910°C and 1400°C

Near melting point

Room temperature

Between 1400°C and 1539°C

14. Combined carbon in iron makes the metal

Hard and gives a coarse grained crystalline structure

Soft and gives coarse grained crystalline structure

Hard and gives a fine grained crystalline structure

Soft and gives a fine grained crystalline structure

15. Monel metal is an alloy of

Nickel and chromium

Nickel and copper

Copper and chromium

Nickel, Chromium and iron

16. Carbon steel is

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

Extensively used for making cutting tools

Refined from cast iron

Made by adding carbon in steel

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

Hardness

Melting point

Yield point

Critical temperature

18. Which of the following is an amorphous material?

Mica

Silver

Lead

Glass

19. Steel containing ferrite and pearlite is

Soft

Tough

Hard and tough

Hard

20. 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

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21. 'Killed steels' are those steels

In which carbon is completely burnt

Which are destroyed by burning

Which are deoxidized in the ladle with silicon and aluminium

Which after their destruction are recycled to produce fresh steel

22. The crystal structure of gamma iron is

Body centered cubic

Cubic structure

Face centered cubic

Hexagonal close packed

23. Annealing of white cast iron results in production of

Grey iron

Nodular iron

Spheroidal iron

Malleable iron

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

All of these

Steels are heated to 500 to 700°C

Internal stresses are relieved

Cooling is done slowly and steadily

25. The lower critical temperature

Is same for all steels

Increases as the carbon content in steel increases

Decreases as the carbon content in steel increases

Depends upon the rate of heating

26. 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 is made by adding suitable percentage of carbon to molten iron and subjecting the product to repeated hammering and rolling

It melts at 1535°C

27. Malleable cast iron is produced

By adding magnesium to molten cast iron

None of these

From white cast iron by annealing process

By quick cooling of molten cast iron

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

Free carbon

Flakes

Cementite

Spheroids

29. Cast iron has

High ductility

High tensile strength

All of the above

Its elastic limit close to the ultimate breaking strength

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

Decreases

Increases

Does not effect

None of these

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31. When the steel is normalized, its

Yield point increases

Ductility decreases

All of these

Ultimate tensile strength increases

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

0.2%

2%

1.3%

0.8%

33. Paramagnetic alpha iron changes to gamma iron at

1539°C

1440°C

770°C

910°C

34. In induction hardening ________ is high.

Temperature

Voltage

Current

Frequency

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

Copper

Magnesium

Nickel

Chromium

36. Grey cast iron has

All of these

High tensile strength

Low compressive strength

Carbon in the form of free graphite

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

Flakes

Free carbon

Cementite

Spheroids

38. Manganese is added in low carbon steel to

Make the steel tougher and harder

Make the steel ductile and of good bending qualities

All of the above

Raise the yield point

39. In mottled cast iron, carbon is available in

Nodular form

Combined form

Partly in free and partly in combined state

Free form

40. Induction hardening is basically a

Core hardening process

None of these

Carburising process

Surface hardening process

Engineering Materials Practice Set-6

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