Engineering Materials Practice Set-6

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

1.3%

0.8%

2%

0.2%

2. Combined carbon in iron makes the metal

Soft and gives a fine grained crystalline structure

Soft and gives coarse grained crystalline structure

Hard and gives a coarse grained crystalline structure

Hard and gives a fine grained crystalline structure

3. Monel metal is an alloy of

Nickel and copper

Nickel and chromium

Nickel, Chromium and iron

Copper and chromium

4. When the steel is normalized, its

Ductility decreases

All of these

Ultimate tensile strength increases

Yield point increases

5. Wrought iron is

Heat treated to change its properties

Highly resistant to corrosion

High in strength

Hard

6. The lower critical temperature

Decreases as the carbon content in steel increases

Depends upon the rate of heating

Is same for all steels

Increases as the carbon content in steel increases

7. Manganese is added in low carbon steel to

Make the steel ductile and of good bending qualities

Raise the yield point

Make the steel tougher and harder

All of the above

8. Pure iron is the structure of

Pearlite

Austenite

Ferrite and cementite

Ferrite

9. Iron is

Ferroelectric

Ferromagnetic

Paramagnetic

Dielectric

10. Which of the following is an amorphous material?

Mica

Glass

Lead

Silver

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

Cementite

Flakes

Spheroids

Free carbon

12. Annealing of white cast iron results in production of

Spheroidal iron

Nodular iron

Malleable iron

Grey iron

13. In induction hardening ________ is high.

Voltage

Frequency

Current

Temperature

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

Carbon content

Compressive strength

Ductility

Hardness

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

Internal stresses are relieved

All of these

Cooling is done slowly and steadily

Steels are heated to 500 to 700°C

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

Silicon bronze

White metal

Phosphor bronze

Monel metal

17. Sulphur in pig iron tends to make it

Ductile

Soft

Hard

Tough

18. Gamma iron exits at following temperature

Between 910°C and 1400°C

Between 1400°C and 1539°C

Near melting point

Room temperature

19. Chilled cast iron has

A very high percentage of graphite

Graphite as its basic constituent of composition

A low percentage of graphite

No graphite

20. 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

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21. Induction hardening is basically a

None of these

Carburising process

Core hardening process

Surface hardening process

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

Hexagonal close packed lattice

Face centered cubic lattice

All of the above

Body centered cubic lattice

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

Nickel

Copper

Chromium

Magnesium

24. Steel containing ferrite and pearlite is

Tough

Soft

Hard

Hard and tough

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

Cobalt

Vanadium

Molybdenum

Nickel

26. In mottled cast iron, carbon is available in

Partly in free and partly in combined state

Free form

Nodular form

Combined form

27. The unique property of cast iron is its high

Malleability

Ductility

Damping characteristics

Surface finish

28. The purpose of heat treatment is to

Change grain size

Modify the structure of the material

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

Any one of these

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

Hardness

Critical temperature

Melting point

Yield point

30. Paramagnetic alpha iron changes to gamma iron at

1440°C

910°C

1539°C

770°C

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31. Cast iron has

Its elastic limit close to the ultimate breaking strength

High ductility

All of the above

High tensile strength

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

Cementite

Nodular aggregates of graphite

Flakes

Free carbon

33. Carbon steel is

Extensively used for making cutting tools

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

Made by adding carbon in steel

Refined from cast iron

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

None of these

Decreases

Increases

Does not effect

35. Malleable cast iron is produced

By quick cooling of molten cast iron

By adding magnesium to molten cast iron

From white cast iron by annealing process

None of these

36. 'Killed steels' are those steels

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

In which carbon is completely burnt

37. The crystal of alpha iron is

Face centered cubic

Hexagonal close packed

Body centered cubic

Cubic structure

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

Cementite

Spheroids

Free carbon

Flakes

39. Grey cast iron has

Low compressive strength

All of these

Carbon in the form of free graphite

High tensile strength

40. The crystal structure of gamma iron is

Body centered cubic

Hexagonal close packed

Cubic structure

Face centered cubic

Engineering Materials Practice Set-6

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