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Engineering Materials
0

Engineering Materials Practice Set-8

May 16, 2021

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Page 1 of 4

1. Corrosion resistance of steel is increased by adding

Aluminium and zinc

Nickel and molybdenum

Chromium and nickel

Tungsten and sulphur

2. Tungsten in high speed steel provides

Wear resistance

Hot hardness

Toughness

Sharp cutting edge

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

Vanadium

Nickel

Chromium

Manganese

4. Sulphur in cast iron

Increases hardness and brittleness

Aids fusibility and fluidity

Makes the iron soft and easily machinable

Make the iron white and hard

5. Shock resisting steels should have

Low wear resistance

Toughness

Low hardness

Low tensile strength

6. Free cutting steels

Require least cutting force

Do not exist

Contain carbon in free form

Are used where ease in machining is the criterion

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

0.4%

0.2%

0.6%

0.1%

8. Beryllium bronze has

(D) None of these

(B) High fatigue limit

(C) Both (A) and (B)

(A) High yield point

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

None of these

Same

Less

More

10. Phosphor bronze contains

1% phosphorous

None of the above

2.5% phosphorous

0.5% of phosphorous

Page 2 of 4

11. 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

12. Steel made from phosphate iron is

Hard

Tough

Brittle

Ductile

13. Connecting rod is usually made of

Medium carbon steel

Low carbon steel

Aluminium

High carbon steel

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

Breaks with little permanent distortion

Can cut another metal

Can be drawn into wires

Can be rolled or hammered into thin sheets

15. Cupola produces following material

Cast iron

Wrought iron

Pig iron

Malleable iron

16. Melting point of iron is

1539°C

1489°C

1601°C

1712°C

17. Manganese in steel increases its

Ductility

Fluidity

Hardness

Tensile strength

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

50 : 50

60 : 40

10 : 90

40 : 60

19. Permalloy is a

Polymer

Kind of stainless steel

None ferrous alloy

Nickel and iron alloy having high permeability

20. Argentite is the principal ore or raw material for

Zinc

Aluminium

Tin

Silver

Page 3 of 4

21. 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%

22. An example of amorphous material is

Zinc

Silver

Lead

Glass

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

Bronze

Bell metal

Babbitt metal

Gun metal

24. The machinability of steel is increased by

Sulphur, graphite and aluminium

Silicon and sulphur

Phosphorous and aluminium

Phosphorous, lead and sulphur

25. Weld decay is the phenomenon found with

Stainless steel

Cast iron

Mild steel

Nonferrous materials

26. Perminvar alloy having constant permeability is an alloy of

Nickel, copper and zinc

Iron, zinc and bismuth

Nickel, copper and iron

Copper, nickel and antimony

27. The crystal structure of brass is

B.C.C.

F.C.C.

Orthorhombic crystalline structure

H.C.P.

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

Improve machinability

Improve toughness

Release stresses

Improve ductility

29. High carbon steel carries carbon percentage

0.3 to 0.6%

0.6 to 0.8%

0.8 to 1.5%

0.1 to 0.3%

30. Delta metal is an alloy of

Copper, zinc and iron

Iron, nickel and copper

Iron, lead and tin

Iron, aluminium and magnesium

Page 4 of 4

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

RC 57

RC 65

RC 48

RC 80

32. The hardness of steel increases if it contains

Austenite

Pearlite

Martensite

Cementite

33. Bronze contains

70% copper and 30% zinc

70 - 75% copper and rest tin

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

90% copper and 10% tin

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

Nickel

Iron

Vanadium

Cobalt

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

57

35

710

1015

36. Preheating is essential in welding

All nonferrous materials

High speed steel

Cast iron

All of the above

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

Elinvar

Nichrome

Invar

Magnin

38. Chromium in steel

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

Improves cutting ability and reduces hardenability

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

Improves wear resistance, cutting ability and toughness

39. Carbon in iron is an example of

All of the above

Substitutional solution

Interstitial solid solution

Intermetallic compounds

40. The presence of sulphur in pig iron makes

The casting unsound

It easily machinable

It hard

It brittle

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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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