Engineering Materials Practice Set-8

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1. Phosphor bronze contains

0.5% of phosphorous

2.5% phosphorous

1% phosphorous

None of the above

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

None of these

Same

Less

More

3. Cupola produces following material

Wrought iron

Malleable iron

Cast iron

Pig iron

4. Gun metal contains

70% copper and 30% zinc

90% copper and 10% tin

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

70 - 78% copper and rest tin

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

Can cut another metal

Breaks with little permanent distortion

Can be drawn into wires

Can be rolled or hammered into thin sheets

6. The hardness of steel increases if it contains

Martensite

Austenite

Pearlite

Cementite

7. The presence of sulphur in pig iron makes

It brittle

The casting unsound

It easily machinable

It hard

8. Carbon in iron is an example of

Interstitial solid solution

All of the above

Substitutional solution

Intermetallic compounds

9. Tungsten in high speed steel provides

Hot hardness

Toughness

Wear resistance

Sharp cutting edge

10. Shock resisting steels should have

Low hardness

Low wear resistance

Toughness

Low tensile strength

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11. Steel made from phosphate iron is

Hard

Brittle

Ductile

Tough

12. Chromium in steel

Improves cutting ability and reduces hardenability

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

13. Delta metal is an alloy of

Copper, zinc and iron

Iron, aluminium and magnesium

Iron, lead and tin

Iron, nickel and copper

14. Connecting rod is usually made of

High carbon steel

Aluminium

Medium carbon steel

Low carbon steel

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

50 : 50

40 : 60

10 : 90

60 : 40

16. Melting point of iron is

1712°C

1601°C

1489°C

1539°C

17. Corrosion resistance of steel is increased by adding

Chromium and nickel

Aluminium and zinc

Tungsten and sulphur

Nickel and molybdenum

18. The machinability of steel is increased by

Phosphorous, lead and sulphur

Sulphur, graphite and aluminium

Silicon and sulphur

Phosphorous and aluminium

19. High carbon steel carries carbon percentage

0.6 to 0.8%

0.8 to 1.5%

0.3 to 0.6%

0.1 to 0.3%

20. Free cutting steels

Are used where ease in machining is the criterion

Contain carbon in free form

Do not exist

Require least cutting force

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

Nickel

Manganese

Vanadium

Chromium

22. Beryllium bronze has

(A) High yield point

(C) Both (A) and (B)

(D) None of these

(B) High fatigue limit

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

Improve ductility

Release stresses

Improve machinability

Improve toughness

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

Invar

Elinvar

Nichrome

Magnin

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

Vanadium

Nickel

Cobalt

Iron

26. Sulphur in cast iron

Aids fusibility and fluidity

Increases hardness and brittleness

Make the iron white and hard

Makes the iron soft and easily machinable

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

0.2%

0.6%

0.1%

0.4%

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

RC 80

RC 48

RC 65

RC 57

29. Drop forging dies contain carbon of the order of

0.25 to 0.5%

0.6 to 0.7%

0.7 to 0.9%

0.1 to 0.2%

30. Weld decay is the phenomenon found with

Stainless steel

Nonferrous materials

Cast iron

Mild steel

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

57

35

1015

710

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

Bell metal

Gun metal

Babbitt metal

Bronze

33. An example of amorphous material is

Glass

Zinc

Lead

Silver

34. Preheating is essential in welding

All nonferrous materials

Cast iron

All of the above

High speed steel

35. Manganese in steel increases its

Ductility

Fluidity

Tensile strength

Hardness

36. The crystal structure of brass is

Orthorhombic crystalline structure

B.C.C.

H.C.P.

F.C.C.

37. Bronze contains

90% copper and 10% tin

70% copper and 30% zinc

70 - 75% copper and rest tin

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

38. Argentite is the principal ore or raw material for

Tin

Aluminium

Zinc

Silver

39. Permalloy is a

None ferrous alloy

Nickel and iron alloy having high permeability

Polymer

Kind of stainless steel

40. Perminvar alloy having constant permeability is an alloy of

Nickel, copper and zinc

Iron, zinc and bismuth

Nickel, copper and iron

Copper, nickel and antimony

Engineering Materials Practice Set-8

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