Engineering Materials Practice Set-6

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1. When the steel is normalized, its

All of these

Yield point increases

Ultimate tensile strength increases

Ductility decreases

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

Nickel

Copper

Magnesium

Chromium

3. Chilled cast iron has

Graphite as its basic constituent of composition

A low percentage of graphite

No graphite

A very high percentage of graphite

4. The crystal of alpha iron is

Cubic structure

Face centered cubic

Hexagonal close packed

Body centered cubic

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

Flakes

Cementite

Free carbon

Spheroids

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

Silicon bronze

White metal

Phosphor bronze

Monel metal

7. The unique property of cast iron is its high

Damping characteristics

Surface finish

Ductility

Malleability

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

Cobalt

Molybdenum

Nickel

Vanadium

9. Wrought iron is

Heat treated to change its properties

Hard

High in strength

Highly resistant to corrosion

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

1.3%

2%

0.2%

0.8%

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11. 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

12. Iron is

Dielectric

Paramagnetic

Ferromagnetic

Ferroelectric

13. The purpose of heat treatment is to

Modify the structure of the material

Any one of these

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

Change grain size

14. Gamma iron exits at following temperature

Room temperature

Between 1400°C and 1539°C

Near melting point

Between 910°C and 1400°C

15. Pick up wrong statement about wrought iron

It contains carbon of the order of 0 to 0.25%

It is very soft and ductile

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

16. The crystal structure of gamma iron is

Hexagonal close packed

Cubic structure

Body centered cubic

Face centered cubic

17. Monel metal is an alloy of

Nickel and chromium

Copper and chromium

Nickel and copper

Nickel, Chromium and iron

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

Nodular aggregates of graphite

Free carbon

Flakes

Cementite

19. Combined carbon in iron makes the metal

Soft and gives coarse grained crystalline structure

Hard and gives a coarse grained crystalline structure

Hard and gives a fine grained crystalline structure

Soft and gives a fine grained crystalline structure

20. Sulphur in pig iron tends to make it

Ductile

Hard

Soft

Tough

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

Spheroids

Cementite

Free carbon

Flakes

22. Paramagnetic alpha iron changes to gamma iron at

770°C

1440°C

1539°C

910°C

23. Cast iron has

High tensile strength

All of the above

Its elastic limit close to the ultimate breaking strength

High ductility

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

Increases

None of these

Decreases

Does not effect

25. 'Killed steels' are those steels

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

In which carbon is completely burnt

26. Induction hardening is basically a

Carburising process

Core hardening process

Surface hardening process

None of these

27. Malleable cast iron is produced

By adding magnesium to molten cast iron

By quick cooling of molten cast iron

From white cast iron by annealing process

None of these

28. Which of the following is an amorphous material?

Glass

Silver

Mica

Lead

29. Grey cast iron has

Low compressive strength

All of these

Carbon in the form of free graphite

High tensile strength

30. Pure iron is the structure of

Austenite

Ferrite

Pearlite

Ferrite and cementite

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31. Steel containing ferrite and pearlite is

Tough

Soft

Hard

Hard and tough

32. Manganese is added in low carbon steel to

Make the steel tougher and harder

Make the steel ductile and of good bending qualities

Raise the yield point

All of the above

33. Annealing of white cast iron results in production of

Spheroidal iron

Grey iron

Malleable iron

Nodular iron

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

Face centered cubic lattice

Body centered cubic lattice

Hexagonal close packed lattice

All of the above

35. 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

36. In mottled cast iron, carbon is available in

Nodular form

Partly in free and partly in combined state

Free form

Combined form

37. In induction hardening ________ is high.

Voltage

Current

Temperature

Frequency

38. The lower critical temperature

Increases as the carbon content in steel increases

Depends upon the rate of heating

Decreases as the carbon content in steel increases

Is same for all steels

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

Yield point

Hardness

Melting point

Critical temperature

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

Carbon content

Hardness

Ductility

Compressive strength

Engineering Materials Practice Set-6

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