Engineering Materials Practice Set-8

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

Release stresses

Improve machinability

Improve toughness

Improve ductility

2. Argentite is the principal ore or raw material for

Tin

Aluminium

Zinc

Silver

3. Tungsten in high speed steel provides

Toughness

Hot hardness

Sharp cutting edge

Wear resistance

4. Chromium in steel

Improves cutting ability and reduces hardenability

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

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

Improves wear resistance, cutting ability and toughness

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

Chromium

Vanadium

Manganese

Nickel

6. The machinability of steel is increased by

Phosphorous, lead and sulphur

Sulphur, graphite and aluminium

Silicon and sulphur

Phosphorous and aluminium

7. Bronze contains

70 - 75% copper and rest tin

90% copper and 10% tin

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

70% copper and 30% zinc

8. Corrosion resistance of steel is increased by adding

Aluminium and zinc

Nickel and molybdenum

Tungsten and sulphur

Chromium and nickel

9. Delta metal is an alloy of

Iron, nickel and copper

Iron, aluminium and magnesium

Copper, zinc and iron

Iron, lead and tin

10. Manganese in steel increases its

Ductility

Hardness

Fluidity

Tensile strength

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11. Carbon in iron is an example of

Substitutional solution

Intermetallic compounds

All of the above

Interstitial solid solution

12. Free cutting steels

Are used where ease in machining is the criterion

Do not exist

Require least cutting force

Contain carbon in free form

13. Connecting rod is usually made of

Aluminium

Medium carbon steel

High carbon steel

Low carbon steel

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

Cobalt

Iron

Nickel

Vanadium

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

More

Same

Less

None of these

16. Cupola produces following material

Pig iron

Malleable iron

Wrought iron

Cast iron

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

Elinvar

Invar

Nichrome

Magnin

18. Shock resisting steels should have

Low tensile strength

Toughness

Low hardness

Low wear resistance

19. Phosphor bronze contains

2.5% phosphorous

0.5% of phosphorous

1% phosphorous

None of the above

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

RC 48

RC 80

RC 65

RC 57

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

Babbitt metal

Gun metal

Bell metal

Bronze

22. The hardness of steel increases if it contains

Austenite

Pearlite

Cementite

Martensite

23. Sulphur in cast iron

Aids fusibility and fluidity

Makes the iron soft and easily machinable

Increases hardness and brittleness

Make the iron white and hard

24. Drop forging dies contain carbon of the order of

0.1 to 0.2%

0.7 to 0.9%

0.6 to 0.7%

0.25 to 0.5%

25. An example of amorphous material is

Silver

Zinc

Lead

Glass

26. Gun metal contains

70% copper and 30% zinc

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

90% copper and 10% tin

70 - 78% copper and rest tin

27. Melting point of iron is

1489°C

1539°C

1601°C

1712°C

28. Weld decay is the phenomenon found with

Nonferrous materials

Cast iron

Stainless steel

Mild steel

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

35

57

710

1015

30. Perminvar alloy having constant permeability is an alloy of

Nickel, copper and iron

Nickel, copper and zinc

Copper, nickel and antimony

Iron, zinc and bismuth

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31. Preheating is essential in welding

All nonferrous materials

Cast iron

High speed steel

All of the above

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

10 : 90

40 : 60

60 : 40

50 : 50

33. The crystal structure of brass is

Orthorhombic crystalline structure

F.C.C.

B.C.C.

H.C.P.

34. The presence of sulphur in pig iron makes

It hard

The casting unsound

It brittle

It easily machinable

35. Beryllium bronze has

(B) High fatigue limit

(A) High yield point

(D) None of these

(C) Both (A) and (B)

36. High carbon steel carries carbon percentage

0.1 to 0.3%

0.6 to 0.8%

0.3 to 0.6%

0.8 to 1.5%

37. Permalloy is a

Polymer

None ferrous alloy

Kind of stainless steel

Nickel and iron alloy having high permeability

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

Can be drawn into wires

Can be rolled or hammered into thin sheets

Can cut another metal

Breaks with little permanent distortion

39. Steel made from phosphate iron is

Hard

Brittle

Ductile

Tough

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

0.6%

0.2%

0.1%

0.4%

Engineering Materials Practice Set-8

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