Engineering Materials Practice Set-8

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1. Carbon in iron is an example of

All of the above

Interstitial solid solution

Substitutional solution

Intermetallic compounds

2. Permalloy is a

Nickel and iron alloy having high permeability

Polymer

Kind of stainless steel

None ferrous alloy

3. Chromium in steel

Refines grain size and produces less tendency to carburisation, improves corrosion and heat resistant properties

Improves wear resistance, cutting ability and toughness

Gives ductility, toughness, tensile strength and anti-corrosion properties

Improves cutting ability and reduces hardenability

4. Compressive strength of grey cast iron in tonnes/cm is of the order of

57

710

35

1015

5. Perminvar alloy having constant permeability is an alloy of

Nickel, copper and iron

Copper, nickel and antimony

Iron, zinc and bismuth

Nickel, copper and zinc

6. An example of amorphous material is

Silver

Lead

Zinc

Glass

7. High carbon steel carries carbon percentage

0.3 to 0.6%

0.1 to 0.3%

0.8 to 1.5%

0.6 to 0.8%

8. Melting point of iron is

1712°C

1489°C

1539°C

1601°C

9. Which of the following is the binding material in cemented carbides?

Nickel

Vanadium

Iron

Cobalt

10. Cupola produces following material

Pig iron

Malleable iron

Wrought iron

Cast iron

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11. Steel made from phosphate iron is

Hard

Tough

Ductile

Brittle

12. The crystal structure of brass is

B.C.C.

Orthorhombic crystalline structure

H.C.P.

F.C.C.

13. Weld decay is the phenomenon found with

Cast iron

Mild steel

Stainless steel

Nonferrous materials

14. Sulphur in cast iron

Increases hardness and brittleness

Make the iron white and hard

Aids fusibility and fluidity

Makes the iron soft and easily machinable

15. The machinability of steel is increased by

Phosphorous, lead and sulphur

Sulphur, graphite and aluminium

Silicon and sulphur

Phosphorous and aluminium

16. Free cutting steels

Require least cutting force

Do not exist

Contain carbon in free form

Are used where ease in machining is the criterion

17. Tungsten in high speed steel provides

Sharp cutting edge

Toughness

Hot hardness

Wear resistance

18. The hardness of steel increases if it contains

Cementite

Pearlite

Martensite

Austenite

19. Phosphor bronze contains

None of the above

2.5% phosphorous

1% phosphorous

0.5% of phosphorous

20. Which is false statement about tempering? Tempering is done to

Improve ductility

Release stresses

Improve toughness

Improve machinability

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21. Argentite is the principal ore or raw material for

Zinc

Tin

Silver

Aluminium

22. Shock resisting steels should have

Low hardness

Low tensile strength

Low wear resistance

Toughness

23. Connecting rod is usually made of

Medium carbon steel

Aluminium

High carbon steel

Low carbon steel

24. Cold rolled steel sheets contain carbon of the following order

0.4%

0.2%

0.6%

0.1%

25. Aluminium bronze contains aluminium and copper in the ratio of

10 : 90

50 : 50

60 : 40

40 : 60

26. Gun metal contains

70 - 78% copper and rest tin

85 - 92% copper and rest tin with little lead and nickel

90% copper and 10% tin

70% copper and 30% zinc

27. Bronze contains

70 - 75% copper and rest tin

70% copper and 30% zinc

90% copper and 10% tin

85 - 92% copper and rest tin with little lead and nickel

28. Delta metal is an alloy of

Copper, zinc and iron

Iron, aluminium and magnesium

Iron, nickel and copper

Iron, lead and tin

29. Drop forging dies contain carbon of the order of

0.1 to 0.2%

0.7 to 0.9%

0.25 to 0.5%

0.6 to 0.7%

30. Preheating is essential in welding

High speed steel

All of the above

Cast iron

All nonferrous materials

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31. Corrosion resistance of steel is increased by adding

Nickel and molybdenum

Tungsten and sulphur

Aluminium and zinc

Chromium and nickel

32. Nimonic contains __________ percentage of nickel as that of Inconel.

More

Less

Same

None of these

33. Which of the following is used for bearing liner?

Bronze

Gun metal

Bell metal

Babbitt metal

34. The alloying element which reduces the formation of iron sulphide in steel is

Nickel

Manganese

Chromium

Vanadium

35. The hardness is the property of a material due to which it

Can be drawn into wires

Breaks with little permanent distortion

Can be rolled or hammered into thin sheets

Can cut another metal

36. Hardness of upper bainite (acicular structure) is about

RC 80

RC 48

RC 65

RC 57

37. Beryllium bronze has

(B) High fatigue limit

(C) Both (A) and (B)

(D) None of these

(A) High yield point

38. The alloy used for making electrical resistances and heating elements is

Elinvar

Invar

Nichrome

Magnin

39. The presence of sulphur in pig iron makes

It hard

The casting unsound

It easily machinable

It brittle

40. Manganese in steel increases its

Ductility

Hardness

Fluidity

Tensile strength

Engineering Materials Practice Set-8

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