Engineering Materials Practice Set-8

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1. Melting point of iron is

1601°C

1489°C

1539°C

1712°C

2. Connecting rod is usually made of

Low carbon steel

Medium carbon steel

Aluminium

High carbon steel

3. Perminvar alloy having constant permeability is an alloy of

Copper, nickel and antimony

Nickel, copper and zinc

Iron, zinc and bismuth

Nickel, copper and iron

4. Beryllium bronze has

(B) High fatigue limit

(D) None of these

(A) High yield point

(C) Both (A) and (B)

5. Manganese in steel increases its

Tensile strength

Fluidity

Hardness

Ductility

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

Gun metal

Bronze

Bell metal

Babbitt metal

7. An example of amorphous material is

Zinc

Lead

Glass

Silver

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

50 : 50

60 : 40

40 : 60

10 : 90

9. Steel made from phosphate iron is

Tough

Brittle

Ductile

Hard

10. Permalloy is a

Kind of stainless steel

Polymer

None ferrous alloy

Nickel and iron alloy having high permeability

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11. The machinability of steel is increased by

Phosphorous and aluminium

Silicon and sulphur

Sulphur, graphite and aluminium

Phosphorous, lead and sulphur

12. The crystal structure of brass is

F.C.C.

H.C.P.

B.C.C.

Orthorhombic crystalline structure

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

Cobalt

Nickel

Iron

Vanadium

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

Nickel

Manganese

Chromium

Vanadium

15. High carbon steel carries carbon percentage

0.1 to 0.3%

0.3 to 0.6%

0.8 to 1.5%

0.6 to 0.8%

16. Phosphor bronze contains

0.5% of phosphorous

1% phosphorous

2.5% phosphorous

None of the above

17. Tungsten in high speed steel provides

Wear resistance

Sharp cutting edge

Toughness

Hot hardness

18. Corrosion resistance of steel is increased by adding

Chromium and nickel

Tungsten and sulphur

Aluminium and zinc

Nickel and molybdenum

19. 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

20. Preheating is essential in welding

Cast iron

High speed steel

All of the above

All nonferrous materials

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

Elinvar

Magnin

Invar

Nichrome

23. Drop forging dies contain carbon of the order of

0.6 to 0.7%

0.7 to 0.9%

0.25 to 0.5%

0.1 to 0.2%

24. The hardness of steel increases if it contains

Austenite

Pearlite

Martensite

Cementite

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

None of these

Same

More

Less

26. Delta metal is an alloy of

Copper, zinc and iron

Iron, aluminium and magnesium

Iron, lead and tin

Iron, nickel and copper

27. Cupola produces following material

Malleable iron

Pig iron

Wrought iron

Cast iron

28. Chromium in steel

Improves wear resistance, cutting ability and toughness

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

Improves cutting ability and reduces hardenability

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

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

710

57

1015

35

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

0.2%

0.1%

0.6%

0.4%

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

Improve ductility

Improve toughness

Improve machinability

Release stresses

32. Carbon in iron is an example of

Interstitial solid solution

Substitutional solution

Intermetallic compounds

All of the above

33. The presence of sulphur in pig iron makes

It hard

It easily machinable

The casting unsound

It brittle

34. Shock resisting steels should have

Low wear resistance

Low tensile strength

Low hardness

Toughness

35. Sulphur in cast iron

Make the iron white and hard

Makes the iron soft and easily machinable

Aids fusibility and fluidity

Increases hardness and brittleness

36. Gun metal contains

90% copper and 10% tin

70 - 78% copper and rest tin

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

70% copper and 30% zinc

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

RC 80

RC 65

RC 57

RC 48

38. Weld decay is the phenomenon found with

Cast iron

Mild steel

Stainless steel

Nonferrous materials

39. Argentite is the principal ore or raw material for

Silver

Aluminium

Tin

Zinc

40. Free cutting steels

Are used where ease in machining is the criterion

Require least cutting force

Do not exist

Contain carbon in free form

Engineering Materials Practice Set-8

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