Engineering Materials Practice Set-8

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1. Beryllium bronze has

(C) Both (A) and (B)

(B) High fatigue limit

(D) None of these

(A) High yield point

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

Same

More

Less

None of these

3. Weld decay is the phenomenon found with

Cast iron

Mild steel

Nonferrous materials

Stainless steel

4. Melting point of iron is

1539°C

1601°C

1712°C

1489°C

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

35

1015

710

57

6. Shock resisting steels should have

Toughness

Low tensile strength

Low wear resistance

Low hardness

7. Corrosion resistance of steel is increased by adding

Chromium and nickel

Tungsten and sulphur

Nickel and molybdenum

Aluminium and zinc

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

Babbitt metal

Bronze

Bell metal

Gun metal

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

0.2%

0.6%

0.4%

0.1%

10. Free cutting steels

Are used where ease in machining is the criterion

Contain carbon in free form

Require least cutting force

Do not exist

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11. The machinability of steel is increased by

Phosphorous, lead and sulphur

Silicon and sulphur

Phosphorous and aluminium

Sulphur, graphite and aluminium

12. Cupola produces following material

Wrought iron

Cast iron

Pig iron

Malleable iron

13. Perminvar alloy having constant permeability is an alloy of

Iron, zinc and bismuth

Nickel, copper and iron

Nickel, copper and zinc

Copper, nickel and antimony

14. Drop forging dies contain carbon of the order of

0.25 to 0.5%

0.7 to 0.9%

0.6 to 0.7%

0.1 to 0.2%

15. Bronze contains

90% copper and 10% tin

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

70 - 75% copper and rest tin

70% copper and 30% zinc

16. Connecting rod is usually made of

Low carbon steel

Medium carbon steel

High carbon steel

Aluminium

17. Steel made from phosphate iron is

Ductile

Tough

Brittle

Hard

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

Can cut another metal

Can be drawn into wires

Can be rolled or hammered into thin sheets

Breaks with little permanent distortion

19. An example of amorphous material is

Glass

Lead

Zinc

Silver

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

RC 80

RC 57

RC 65

RC 48

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21. The presence of sulphur in pig iron makes

The casting unsound

It easily machinable

It brittle

It hard

22. Tungsten in high speed steel provides

Toughness

Wear resistance

Sharp cutting edge

Hot hardness

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

50 : 50

10 : 90

40 : 60

60 : 40

24. Preheating is essential in welding

High speed steel

All of the above

Cast iron

All nonferrous materials

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

Improve ductility

Improve toughness

Improve machinability

Release stresses

26. Carbon in iron is an example of

All of the above

Substitutional solution

Intermetallic compounds

Interstitial solid solution

27. Chromium in steel

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

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

Improves wear resistance, cutting ability and toughness

Improves cutting ability and reduces hardenability

28. The hardness of steel increases if it contains

Austenite

Cementite

Pearlite

Martensite

29. Delta metal is an alloy of

Copper, zinc and iron

Iron, aluminium and magnesium

Iron, lead and tin

Iron, nickel and copper

30. Sulphur in cast iron

Makes the iron soft and easily machinable

Increases hardness and brittleness

Aids fusibility and fluidity

Make the iron white and hard

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31. High carbon steel carries carbon percentage

0.8 to 1.5%

0.6 to 0.8%

0.3 to 0.6%

0.1 to 0.3%

32. Phosphor bronze contains

1% phosphorous

None of the above

2.5% phosphorous

0.5% of phosphorous

33. The crystal structure of brass is

H.C.P.

Orthorhombic crystalline structure

B.C.C.

F.C.C.

34. Gun metal contains

90% copper and 10% tin

70% copper and 30% zinc

70 - 78% copper and rest tin

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

35. Manganese in steel increases its

Ductility

Hardness

Tensile strength

Fluidity

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

Chromium

Manganese

Vanadium

Nickel

37. Permalloy is a

Nickel and iron alloy having high permeability

None ferrous alloy

Kind of stainless steel

Polymer

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

Magnin

Elinvar

Nichrome

Invar

39. Argentite is the principal ore or raw material for

Tin

Zinc

Silver

Aluminium

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

Cobalt

Vanadium

Nickel

Iron

Engineering Materials Practice Set-8

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