Engineering Materials Practice Set-6

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

Vanadium

Nickel

Cobalt

Molybdenum

2. Cast iron has

High tensile strength

High ductility

All of the above

Its elastic limit close to the ultimate breaking strength

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

Hardness

Yield point

Critical temperature

Melting point

4. The crystal of alpha iron is

Body centered cubic

Hexagonal close packed

Cubic structure

Face centered cubic

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

Body centered cubic lattice

All of the above

Hexagonal close packed lattice

Face centered cubic lattice

6. Combined carbon in iron makes the metal

Hard and gives a fine grained crystalline structure

Soft and gives coarse grained crystalline structure

Soft and gives a fine grained crystalline structure

Hard and gives a coarse grained crystalline structure

7. Carbon steel is

Made by adding carbon in steel

Extensively used for making cutting tools

Refined from cast iron

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

8. The lower critical temperature

Is same for all steels

Depends upon the rate of heating

Increases as the carbon content in steel increases

Decreases as the carbon content in steel increases

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

Flakes

Free carbon

Cementite

Spheroids

10. Monel metal is an alloy of

Copper and chromium

Nickel and chromium

Nickel and copper

Nickel, Chromium and iron

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11. 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

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

Carbon content

Compressive strength

Ductility

Hardness

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

White metal

Phosphor bronze

Monel metal

Silicon bronze

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

Magnesium

Nickel

Chromium

Copper

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

Spheroids

Cementite

Free carbon

Flakes

16. Sulphur in pig iron tends to make it

Ductile

Soft

Tough

Hard

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

Nodular aggregates of graphite

Flakes

Free carbon

Cementite

18. When the steel is normalized, its

Ductility decreases

All of these

Yield point increases

Ultimate tensile strength increases

19. Malleable cast iron is produced

By quick cooling of molten cast iron

From white cast iron by annealing process

None of these

By adding magnesium to molten cast iron

20. Manganese is added in low carbon steel to

All of the above

Make the steel ductile and of good bending qualities

Make the steel tougher and harder

Raise the yield point

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21. In mottled cast iron, carbon is available in

Nodular form

Free form

Partly in free and partly in combined state

Combined form

22. Chilled cast iron has

Graphite as its basic constituent of composition

No graphite

A very high percentage of graphite

A low percentage of graphite

23. Iron is

Paramagnetic

Dielectric

Ferromagnetic

Ferroelectric

24. In induction hardening ________ is high.

Voltage

Current

Temperature

Frequency

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

Increases

None of these

Does not effect

Decreases

26. Pure iron is the structure of

Pearlite

Austenite

Ferrite and cementite

Ferrite

27. The purpose of heat treatment is to

Any one of these

Modify the structure of the material

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

Change grain size

28. '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

In which carbon is completely burnt

Which are destroyed by burning

29. Steel containing ferrite and pearlite is

Soft

Tough

Hard and tough

Hard

30. Which of the following is an amorphous material?

Silver

Glass

Mica

Lead

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

It is very soft and ductile

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

0.8%

2%

0.2%

1.3%

33. The unique property of cast iron is its high

Ductility

Malleability

Surface finish

Damping characteristics

34. Paramagnetic alpha iron changes to gamma iron at

910°C

1539°C

770°C

1440°C

35. Wrought iron is

Heat treated to change its properties

High in strength

Highly resistant to corrosion

Hard

36. Annealing of white cast iron results in production of

Nodular iron

Malleable iron

Spheroidal iron

Grey iron

37. Grey cast iron has

All of these

High tensile strength

Carbon in the form of free graphite

Low compressive strength

38. The crystal structure of gamma iron is

Hexagonal close packed

Face centered cubic

Cubic structure

Body centered cubic

39. Induction hardening is basically a

Surface hardening process

None of these

Core hardening process

Carburising process

40. Gamma iron exits at following temperature

Near melting point

Between 910°C and 1400°C

Room temperature

Between 1400°C and 1539°C

Engineering Materials Practice Set-6

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