Engineering Materials Practice Set-8

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1. Perminvar alloy having constant permeability is an alloy of

Nickel, copper and iron

Iron, zinc and bismuth

Nickel, copper and zinc

Copper, nickel and antimony

2. Bronze contains

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

70 - 75% copper and rest tin

70% copper and 30% zinc

90% copper and 10% tin

3. Connecting rod is usually made of

Low carbon steel

Aluminium

High carbon steel

Medium carbon steel

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

Bronze

Gun metal

Bell metal

Babbitt metal

5. The crystal structure of brass is

F.C.C.

B.C.C.

Orthorhombic crystalline structure

H.C.P.

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

0.1%

0.4%

0.2%

0.6%

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

Magnin

Nichrome

Invar

Elinvar

8. An example of amorphous material is

Zinc

Glass

Silver

Lead

9. The hardness of steel increases if it contains

Pearlite

Martensite

Austenite

Cementite

10. Delta metal is an alloy of

Copper, zinc and iron

Iron, nickel and copper

Iron, lead and tin

Iron, aluminium and magnesium

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11. Permalloy is a

None ferrous alloy

Polymer

Nickel and iron alloy having high permeability

Kind of stainless steel

12. Weld decay is the phenomenon found with

Cast iron

Nonferrous materials

Mild steel

Stainless steel

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

Iron

Nickel

Cobalt

Vanadium

14. Free cutting steels

Contain carbon in free form

Require least cutting force

Do not exist

Are used where ease in machining is the criterion

15. Melting point of iron is

1539°C

1601°C

1712°C

1489°C

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

57

710

1015

35

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

Improve machinability

Improve ductility

Release stresses

Improve toughness

18. Beryllium bronze has

(B) High fatigue limit

(A) High yield point

(C) Both (A) and (B)

(D) None of these

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

RC 80

RC 48

RC 57

RC 65

20. Tungsten in high speed steel provides

Toughness

Wear resistance

Hot hardness

Sharp cutting edge

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

Breaks with little permanent distortion

Can be rolled or hammered into thin sheets

Can cut another metal

Can be drawn into wires

22. Shock resisting steels should have

Low hardness

Toughness

Low wear resistance

Low tensile strength

23. Steel made from phosphate iron is

Hard

Brittle

Ductile

Tough

24. High carbon steel carries carbon percentage

0.8 to 1.5%

0.3 to 0.6%

0.1 to 0.3%

0.6 to 0.8%

25. Gun metal contains

70 - 78% 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

26. Carbon in iron is an example of

Substitutional solution

Intermetallic compounds

All of the above

Interstitial solid solution

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

Less

Same

None of these

More

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

Vanadium

Nickel

Chromium

Manganese

29. Chromium in steel

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

Improves cutting ability and reduces hardenability

30. Argentite is the principal ore or raw material for

Tin

Aluminium

Silver

Zinc

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31. The machinability of steel is increased by

Phosphorous and aluminium

Phosphorous, lead and sulphur

Sulphur, graphite and aluminium

Silicon and sulphur

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

10 : 90

50 : 50

60 : 40

40 : 60

33. 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%

34. The presence of sulphur in pig iron makes

The casting unsound

It brittle

It easily machinable

It hard

35. Phosphor bronze contains

0.5% of phosphorous

2.5% phosphorous

1% phosphorous

None of the above

36. Corrosion resistance of steel is increased by adding

Nickel and molybdenum

Tungsten and sulphur

Chromium and nickel

Aluminium and zinc

37. Preheating is essential in welding

All nonferrous materials

High speed steel

Cast iron

All of the above

38. Sulphur in cast iron

Make the iron white and hard

Aids fusibility and fluidity

Increases hardness and brittleness

Makes the iron soft and easily machinable

39. Manganese in steel increases its

Hardness

Ductility

Tensile strength

Fluidity

40. Cupola produces following material

Malleable iron

Pig iron

Wrought iron

Cast iron

Engineering Materials Practice Set-8

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