Engineering Materials Practice Set-6

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1. In induction hardening ________ is high.

Voltage

Frequency

Current

Temperature

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

Hardness

Critical temperature

Yield point

Melting point

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

Compressive strength

Ductility

Carbon content

Hardness

4. Pure iron is the structure of

Ferrite and cementite

Pearlite

Austenite

Ferrite

5. Gamma iron exits at following temperature

Between 910°C and 1400°C

Near melting point

Room temperature

Between 1400°C and 1539°C

6. Wrought iron is

High in strength

Highly resistant to corrosion

Heat treated to change its properties

Hard

7. Malleable cast iron is produced

From white cast iron by annealing process

By quick cooling of molten cast iron

By adding magnesium to molten cast iron

None of these

8. The crystal of alpha iron is

Body centered cubic

Face centered cubic

Hexagonal close packed

Cubic structure

9. The purpose of heat treatment is to

Change grain size

Modify the structure of the material

Any one of these

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

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

Nickel

Chromium

Magnesium

Copper

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

Decreases

Does not effect

None of these

Increases

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

Nodular aggregates of graphite

Cementite

Free carbon

Flakes

13. When the steel is normalized, its

Ultimate tensile strength increases

Yield point increases

All of these

Ductility decreases

14. Steel containing ferrite and pearlite is

Soft

Tough

Hard and tough

Hard

15. The unique property of cast iron is its high

Damping characteristics

Malleability

Ductility

Surface finish

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

All of the above

Face centered cubic lattice

Hexagonal close packed lattice

Body centered cubic lattice

17. Annealing of white cast iron results in production of

Grey iron

Spheroidal iron

Nodular iron

Malleable iron

18. The crystal structure of gamma iron is

Body centered cubic

Cubic structure

Hexagonal close packed

Face centered cubic

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

Spheroids

Cementite

Free carbon

Flakes

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

1.3%

2%

0.2%

0.8%

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

All of these

Cooling is done slowly and steadily

Steels are heated to 500 to 700°C

Internal stresses are relieved

22. 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

23. Which of the following is an amorphous material?

Silver

Glass

Mica

Lead

24. Grey cast iron has

Carbon in the form of free graphite

Low compressive strength

High tensile strength

All of these

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

Molybdenum

Cobalt

Vanadium

Nickel

26. Manganese is added in low carbon steel to

Make the steel ductile and of good bending qualities

All of the above

Raise the yield point

Make the steel tougher and harder

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

Spheroids

Cementite

Free carbon

Flakes

28. Paramagnetic alpha iron changes to gamma iron at

910°C

770°C

1440°C

1539°C

29. Cast iron has

Its elastic limit close to the ultimate breaking strength

All of the above

High tensile strength

High ductility

30. Chilled cast iron has

No graphite

A low percentage of graphite

A very high percentage of graphite

Graphite as its basic constituent of composition

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31. Monel metal is an alloy of

Nickel and chromium

Nickel and copper

Copper and chromium

Nickel, Chromium and iron

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

Monel metal

Silicon bronze

White metal

Phosphor bronze

33. The lower critical temperature

Decreases as the carbon content in steel increases

Depends upon the rate of heating

Increases as the carbon content in steel increases

Is same for all steels

34. Iron is

Ferroelectric

Ferromagnetic

Paramagnetic

Dielectric

35. Induction hardening is basically a

None of these

Carburising process

Surface hardening process

Core hardening process

36. In mottled cast iron, carbon is available in

Free form

Nodular form

Combined form

Partly in free and partly in combined state

37. 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

38. 'Killed steels' are those steels

In which carbon is completely burnt

Which after their destruction are recycled to produce fresh steel

Which are deoxidized in the ladle with silicon and aluminium

Which are destroyed by burning

39. Sulphur in pig iron tends to make it

Soft

Hard

Ductile

Tough

40. 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%

Engineering Materials Practice Set-6

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