Engineering Materials Practice Set-6

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

Monel metal

White metal

Silicon bronze

Phosphor bronze

2. '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

3. The crystal of alpha iron is

Face centered cubic

Hexagonal close packed

Body centered cubic

Cubic structure

4. The unique property of cast iron is its high

Surface finish

Damping characteristics

Malleability

Ductility

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

Face centered cubic lattice

Hexagonal close packed lattice

All of the above

Body centered cubic lattice

6. Gamma iron exits at following temperature

Between 1400°C and 1539°C

Near melting point

Between 910°C and 1400°C

Room temperature

7. Monel metal is an alloy of

Copper and chromium

Nickel and copper

Nickel and chromium

Nickel, Chromium and iron

8. Carbon steel is

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

Refined from cast iron

Made by adding carbon in steel

Extensively used for making cutting tools

9. Sulphur in pig iron tends to make it

Hard

Ductile

Soft

Tough

10. Iron is

Dielectric

Ferroelectric

Paramagnetic

Ferromagnetic

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11. Which of the following is an amorphous material?

Lead

Mica

Silver

Glass

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

Nickel

Chromium

Magnesium

Copper

13. Annealing of white cast iron results in production of

Grey iron

Spheroidal iron

Malleable iron

Nodular iron

14. Malleable cast iron is produced

From white cast iron by annealing process

None of these

By quick cooling of molten cast iron

By adding magnesium to molten cast iron

15. Cast iron has

High tensile strength

High ductility

All of the above

Its elastic limit close to the ultimate breaking strength

16. In mottled cast iron, carbon is available in

Partly in free and partly in combined state

Combined form

Free form

Nodular form

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

Hardness

Critical temperature

Melting point

Yield point

18. 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

19. Pure iron is the structure of

Ferrite

Ferrite and cementite

Pearlite

Austenite

20. Steel containing ferrite and pearlite is

Soft

Hard

Hard and tough

Tough

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

Free carbon

Flakes

Cementite

Nodular aggregates of graphite

22. Paramagnetic alpha iron changes to gamma iron at

1440°C

1539°C

770°C

910°C

23. The crystal structure of gamma iron is

Face centered cubic

Hexagonal close packed

Cubic structure

Body centered cubic

24. Combined carbon in iron makes the metal

Soft and gives a fine grained crystalline structure

Hard and gives a coarse grained crystalline structure

Soft and gives coarse grained crystalline structure

Hard and gives a fine grained crystalline structure

25. 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

26. Wrought iron is

Heat treated to change its properties

Highly resistant to corrosion

High in strength

Hard

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

Cementite

Spheroids

Free carbon

Flakes

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

Nickel

Cobalt

Molybdenum

Vanadium

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

Flakes

Free carbon

Spheroids

Cementite

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

Decreases

Increases

None of these

Does not effect

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

2%

0.2%

1.3%

0.8%

32. In induction hardening ________ is high.

Voltage

Temperature

Current

Frequency

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

Hardness

Compressive strength

Carbon content

Ductility

34. When the steel is normalized, its

Ductility decreases

Ultimate tensile strength increases

Yield point increases

All of these

35. 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

36. The purpose of heat treatment is to

Any one of these

Change grain size

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

Modify the structure of the material

37. Chilled cast iron has

No graphite

A low percentage of graphite

Graphite as its basic constituent of composition

A very high percentage of graphite

38. Induction hardening is basically a

None of these

Surface hardening process

Core hardening process

Carburising process

39. Pick up wrong statement about wrought iron

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

It contains carbon of the order of 0 to 0.25%

40. Grey cast iron has

Carbon in the form of free graphite

Low compressive strength

High tensile strength

All of these

Engineering Materials Practice Set-6

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