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Engineering Materials
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Engineering Materials Practice Set-8

May 16, 2021

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Page 1 of 4

1. 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

2. The hardness of steel increases if it contains

Austenite

Cementite

Martensite

Pearlite

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

RC 48

RC 80

RC 65

RC 57

4. Delta metal is an alloy of

Copper, zinc and iron

Iron, nickel and copper

Iron, lead and tin

Iron, aluminium and magnesium

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

0.6%

0.2%

0.1%

0.4%

6. The presence of sulphur in pig iron makes

It brittle

It hard

It easily machinable

The casting unsound

7. Corrosion resistance of steel is increased by adding

Aluminium and zinc

Nickel and molybdenum

Chromium and nickel

Tungsten and sulphur

8. Free cutting steels

Are used where ease in machining is the criterion

Do not exist

Require least cutting force

Contain carbon in free form

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

More

None of these

Less

Same

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

Invar

Nichrome

Magnin

Elinvar

Page 2 of 4

11. An example of amorphous material is

Silver

Glass

Zinc

Lead

12. Permalloy is a

Kind of stainless steel

Nickel and iron alloy having high permeability

Polymer

None ferrous alloy

13. Perminvar alloy having constant permeability is an alloy of

Copper, nickel and antimony

Nickel, copper and zinc

Nickel, copper and iron

Iron, zinc and bismuth

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

35

710

57

1015

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

Bell metal

Bronze

Gun metal

Babbitt metal

16. Connecting rod is usually made of

Low carbon steel

Aluminium

Medium carbon steel

High carbon steel

17. The machinability of steel is increased by

Silicon and sulphur

Phosphorous and aluminium

Phosphorous, lead and sulphur

Sulphur, graphite and aluminium

18. Carbon in iron is an example of

Intermetallic compounds

All of the above

Substitutional solution

Interstitial solid solution

19. Steel made from phosphate iron is

Brittle

Hard

Ductile

Tough

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

Manganese

Nickel

Chromium

Vanadium

Page 3 of 4

21. The crystal structure of brass is

Orthorhombic crystalline structure

F.C.C.

H.C.P.

B.C.C.

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

Cobalt

Nickel

Vanadium

Iron

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

Can be drawn into wires

Can cut another metal

Can be rolled or hammered into thin sheets

Breaks with little permanent distortion

24. Melting point of iron is

1601°C

1712°C

1539°C

1489°C

25. Manganese in steel increases its

Hardness

Tensile strength

Fluidity

Ductility

26. Preheating is essential in welding

High speed steel

All of the above

Cast iron

All nonferrous materials

27. Phosphor bronze contains

None of the above

0.5% of phosphorous

2.5% phosphorous

1% phosphorous

28. Drop forging dies contain carbon of the order of

0.1 to 0.2%

0.7 to 0.9%

0.25 to 0.5%

0.6 to 0.7%

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

Improve machinability

Release stresses

Improve toughness

Improve ductility

30. Shock resisting steels should have

Low hardness

Toughness

Low wear resistance

Low tensile strength

Page 4 of 4

31. Weld decay is the phenomenon found with

Cast iron

Mild steel

Nonferrous materials

Stainless steel

32. Sulphur in cast iron

Increases hardness and brittleness

Makes the iron soft and easily machinable

Make the iron white and hard

Aids fusibility and fluidity

33. Tungsten in high speed steel provides

Sharp cutting edge

Hot hardness

Wear resistance

Toughness

34. Chromium in steel

Improves wear resistance, cutting ability and toughness

Improves cutting ability and reduces hardenability

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

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

35. 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%

36. Cupola produces following material

Malleable iron

Wrought iron

Pig iron

Cast iron

37. Argentite is the principal ore or raw material for

Zinc

Aluminium

Silver

Tin

38. Beryllium bronze has

(C) Both (A) and (B)

(A) High yield point

(D) None of these

(B) High fatigue limit

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

60 : 40

50 : 50

40 : 60

10 : 90

40. Bronze contains

70% copper and 30% zinc

90% copper and 10% tin

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

70 - 75% copper and rest tin

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A Demrot is the founder of VideRime Online Learning, a leading engineering website. He did his BE Civil and M.Tech Structure from RGPV University, Bhopal and has been working as an Assistant Professor in a reputed college.

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