Engineering Materials Practice Set-8

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1. 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

2. Drop forging dies contain carbon of the order of

0.6 to 0.7%

0.7 to 0.9%

0.1 to 0.2%

0.25 to 0.5%

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

Invar

Elinvar

Magnin

Nichrome

4. Tungsten in high speed steel provides

Sharp cutting edge

Wear resistance

Toughness

Hot hardness

5. Weld decay is the phenomenon found with

Nonferrous materials

Cast iron

Stainless steel

Mild steel

6. Phosphor bronze contains

0.5% of phosphorous

2.5% phosphorous

1% phosphorous

None of the above

7. Free cutting steels

Contain carbon in free form

Require least cutting force

Do not exist

Are used where ease in machining is the criterion

8. Bronze contains

70 - 75% copper and rest tin

90% copper and 10% tin

70% copper and 30% zinc

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

9. Argentite is the principal ore or raw material for

Silver

Zinc

Tin

Aluminium

10. Carbon in iron is an example of

Interstitial solid solution

Intermetallic compounds

Substitutional solution

All of the above

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

Can be drawn into wires

Can be rolled or hammered into thin sheets

Can cut another metal

Breaks with little permanent distortion

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

Vanadium

Nickel

Manganese

Chromium

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

RC 80

RC 65

RC 48

RC 57

14. The presence of sulphur in pig iron makes

It easily machinable

The casting unsound

It brittle

It hard

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

Vanadium

Nickel

Cobalt

Iron

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

0.4%

0.2%

0.6%

0.1%

17. Preheating is essential in welding

All nonferrous materials

All of the above

High speed steel

Cast iron

18. Delta metal is an alloy of

Copper, zinc and iron

Iron, nickel and copper

Iron, lead and tin

Iron, aluminium and magnesium

19. Beryllium bronze has

(C) Both (A) and (B)

(A) High yield point

(B) High fatigue limit

(D) None of these

20. Chromium in steel

Improves cutting ability and reduces hardenability

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

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21. Shock resisting steels should have

Toughness

Low wear resistance

Low tensile strength

Low hardness

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

Same

Less

More

None of these

23. Corrosion resistance of steel is increased by adding

Tungsten and sulphur

Nickel and molybdenum

Aluminium and zinc

Chromium and nickel

24. Perminvar alloy having constant permeability is an alloy of

Nickel, copper and zinc

Copper, nickel and antimony

Iron, zinc and bismuth

Nickel, copper and iron

25. Gun metal contains

90% copper and 10% tin

70% copper and 30% zinc

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

70 - 78% copper and rest tin

26. The crystal structure of brass is

B.C.C.

F.C.C.

Orthorhombic crystalline structure

H.C.P.

27. The hardness of steel increases if it contains

Pearlite

Cementite

Austenite

Martensite

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

Bell metal

Babbitt metal

Gun metal

Bronze

29. High carbon steel carries carbon percentage

0.1 to 0.3%

0.3 to 0.6%

0.6 to 0.8%

0.8 to 1.5%

30. Cupola produces following material

Cast iron

Malleable iron

Pig iron

Wrought iron

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31. Melting point of iron is

1539°C

1489°C

1712°C

1601°C

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

Release stresses

Improve ductility

Improve toughness

Improve machinability

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

710

35

57

1015

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

50 : 50

10 : 90

60 : 40

40 : 60

35. An example of amorphous material is

Glass

Lead

Zinc

Silver

36. Connecting rod is usually made of

Aluminium

Low carbon steel

Medium carbon steel

High carbon steel

37. Manganese in steel increases its

Ductility

Hardness

Tensile strength

Fluidity

38. Permalloy is a

Kind of stainless steel

Polymer

None ferrous alloy

Nickel and iron alloy having high permeability

39. The machinability of steel is increased by

Sulphur, graphite and aluminium

Phosphorous and aluminium

Phosphorous, lead and sulphur

Silicon and sulphur

40. Steel made from phosphate iron is

Brittle

Hard

Ductile

Tough

Engineering Materials Practice Set-8

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