Engineering Materials Practice Set-8

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1. Connecting rod is usually made of

Low carbon steel

Medium carbon steel

High carbon steel

Aluminium

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

Nickel

Manganese

Chromium

Vanadium

3. High carbon steel carries carbon percentage

0.8 to 1.5%

0.6 to 0.8%

0.1 to 0.3%

0.3 to 0.6%

4. Steel made from phosphate iron is

Brittle

Tough

Ductile

Hard

5. Cupola produces following material

Cast iron

Wrought iron

Malleable iron

Pig iron

6. Weld decay is the phenomenon found with

Cast iron

Nonferrous materials

Mild steel

Stainless steel

7. Gun metal contains

70 - 78% copper and rest tin

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

70% copper and 30% zinc

90% copper and 10% tin

8. Shock resisting steels should have

Toughness

Low wear resistance

Low tensile strength

Low hardness

9. Perminvar alloy having constant permeability is an alloy of

Nickel, copper and iron

Nickel, copper and zinc

Iron, zinc and bismuth

Copper, nickel and antimony

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

0.1%

0.2%

0.4%

0.6%

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

More

Less

None of these

Same

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

Vanadium

Iron

Nickel

Cobalt

13. An example of amorphous material is

Zinc

Lead

Glass

Silver

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

40 : 60

50 : 50

60 : 40

10 : 90

15. Free cutting steels

Contain carbon in free form

Require least cutting force

Are used where ease in machining is the criterion

Do not exist

16. Phosphor bronze contains

None of the above

2.5% phosphorous

1% phosphorous

0.5% of phosphorous

17. Melting point of iron is

1601°C

1539°C

1712°C

1489°C

18. Drop forging dies contain carbon of the order of

0.7 to 0.9%

0.6 to 0.7%

0.25 to 0.5%

0.1 to 0.2%

19. The crystal structure of brass is

Orthorhombic crystalline structure

F.C.C.

B.C.C.

H.C.P.

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

Can cut another metal

Breaks with little permanent distortion

Can be rolled or hammered into thin sheets

Can be drawn into wires

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21. Permalloy is a

Kind of stainless steel

Polymer

None ferrous alloy

Nickel and iron alloy having high permeability

22. The hardness of steel increases if it contains

Austenite

Martensite

Cementite

Pearlite

23. Delta metal is an alloy of

Iron, aluminium and magnesium

Iron, lead and tin

Copper, zinc and iron

Iron, nickel and copper

24. Preheating is essential in welding

All of the above

Cast iron

High speed steel

All nonferrous materials

25. Tungsten in high speed steel provides

Sharp cutting edge

Hot hardness

Toughness

Wear resistance

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

Bell metal

Gun metal

Babbitt metal

Bronze

27. Corrosion resistance of steel is increased by adding

Tungsten and sulphur

Aluminium and zinc

Chromium and nickel

Nickel and molybdenum

28. Argentite is the principal ore or raw material for

Aluminium

Zinc

Silver

Tin

29. Sulphur in cast iron

Makes the iron soft and easily machinable

Aids fusibility and fluidity

Make the iron white and hard

Increases hardness and brittleness

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

RC 48

RC 80

RC 57

RC 65

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31. Bronze contains

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

70% copper and 30% zinc

70 - 75% copper and rest tin

90% copper and 10% tin

32. Manganese in steel increases its

Ductility

Fluidity

Hardness

Tensile strength

33. Beryllium bronze has

(B) High fatigue limit

(D) None of these

(C) Both (A) and (B)

(A) High yield point

34. Carbon in iron is an example of

Substitutional solution

All of the above

Intermetallic compounds

Interstitial solid solution

35. The presence of sulphur in pig iron makes

It hard

It easily machinable

The casting unsound

It brittle

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

Nichrome

Elinvar

Invar

Magnin

37. 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

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

Improve ductility

Improve toughness

Improve machinability

Release stresses

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

35

57

710

1015

40. The machinability of steel is increased by

Phosphorous and aluminium

Sulphur, graphite and aluminium

Silicon and sulphur

Phosphorous, lead and sulphur

Engineering Materials Practice Set-8

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