Engineering Materials Practice Set-6

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1. Monel metal is an alloy of

Copper and chromium

Nickel, Chromium and iron

Nickel and copper

Nickel and chromium

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

Phosphor bronze

White metal

Silicon bronze

Monel metal

3. Gamma iron exits at following temperature

Room temperature

Near melting point

Between 1400°C and 1539°C

Between 910°C and 1400°C

4. In mottled cast iron, carbon is available in

Combined form

Free form

Partly in free and partly in combined state

Nodular form

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

Decreases

None of these

Does not effect

Increases

6. The crystal structure of gamma iron is

Hexagonal close packed

Body centered cubic

Face centered cubic

Cubic structure

7. Combined carbon in iron makes the metal

Hard and gives a fine grained crystalline structure

Soft and gives a fine grained crystalline structure

Soft and gives coarse grained crystalline structure

Hard and gives a coarse grained crystalline structure

8. Iron is

Dielectric

Paramagnetic

Ferromagnetic

Ferroelectric

9. Pick up wrong statement about wrought iron

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 melts at 1535°C

It is very soft and ductile

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

Cementite

Free carbon

Nodular aggregates of graphite

Flakes

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11. Paramagnetic alpha iron changes to gamma iron at

1440°C

910°C

770°C

1539°C

12. Wrought iron is

High in strength

Hard

Highly resistant to corrosion

Heat treated to change its properties

13. 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

14. Annealing of white cast iron results in production of

Spheroidal iron

Grey iron

Nodular iron

Malleable iron

15. Grey cast iron has

All of these

High tensile strength

Low compressive strength

Carbon in the form of free graphite

16. The crystal of alpha iron is

Face centered cubic

Cubic structure

Body centered cubic

Hexagonal close packed

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

Face centered cubic lattice

All of the above

Body centered cubic lattice

Hexagonal close packed lattice

18. Cast iron has

High ductility

All of the above

Its elastic limit close to the ultimate breaking strength

High tensile strength

19. The unique property of cast iron is its high

Malleability

Ductility

Surface finish

Damping characteristics

20. 'Killed steels' are those steels

Which are destroyed by burning

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

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21. Steel containing ferrite and pearlite is

Hard

Soft

Tough

Hard and tough

22. Pure iron is the structure of

Pearlite

Ferrite

Austenite

Ferrite and cementite

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

Hardness

Ductility

Compressive strength

Carbon content

24. Malleable cast iron is produced

From white cast iron by annealing process

By adding magnesium to molten cast iron

None of these

By quick cooling of molten cast iron

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

Cementite

Flakes

Spheroids

Free carbon

26. Sulphur in pig iron tends to make it

Tough

Ductile

Hard

Soft

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

Chromium

Magnesium

Nickel

Copper

28. In induction hardening ________ is high.

Current

Voltage

Temperature

Frequency

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

Melting point

Yield point

Critical temperature

Hardness

30. Induction hardening is basically a

Surface hardening process

None of these

Core hardening process

Carburising process

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31. 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

32. When the steel is normalized, its

Ultimate tensile strength increases

Yield point increases

All of these

Ductility decreases

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

Cobalt

Nickel

Vanadium

Molybdenum

34. The lower critical temperature

Depends upon the rate of heating

Decreases as the carbon content in steel increases

Increases as the carbon content in steel increases

Is same for all steels

35. Which of the following is an amorphous material?

Lead

Silver

Glass

Mica

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

Cementite

Flakes

Free carbon

Spheroids

37. Carbon steel is

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

Refined from cast iron

Extensively used for making cutting tools

Made by adding carbon in steel

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

0.2%

0.8%

2%

1.3%

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

Steels are heated to 500 to 700°C

Internal stresses are relieved

All of these

Cooling is done slowly and steadily

40. Chilled cast iron has

Graphite as its basic constituent of composition

A very high percentage of graphite

No graphite

A low percentage of graphite

Engineering Materials Practice Set-6

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