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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. Preheating is essential in welding

All nonferrous materials

All of the above

Cast iron

High speed steel

2. Sulphur in cast iron

Increases hardness and brittleness

Makes the iron soft and easily machinable

Aids fusibility and fluidity

Make the iron white and hard

3. The hardness of steel increases if it contains

Cementite

Austenite

Martensite

Pearlite

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

0.2%

0.4%

0.6%

0.1%

5. Manganese in steel increases its

Tensile strength

Ductility

Hardness

Fluidity

6. Delta metal is an alloy of

Iron, nickel and copper

Iron, lead and tin

Iron, aluminium and magnesium

Copper, zinc and iron

7. Steel made from phosphate iron is

Hard

Ductile

Tough

Brittle

8. Beryllium bronze has

(C) Both (A) and (B)

(D) None of these

(B) High fatigue limit

(A) High yield point

9. Melting point of iron is

1712°C

1489°C

1601°C

1539°C

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

Babbitt metal

Bell metal

Gun metal

Bronze

Page 2 of 4

11. High carbon steel carries carbon percentage

0.8 to 1.5%

0.1 to 0.3%

0.6 to 0.8%

0.3 to 0.6%

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

Nichrome

Magnin

Invar

Elinvar

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

60 : 40

40 : 60

50 : 50

10 : 90

14. The crystal structure of brass is

Orthorhombic crystalline structure

F.C.C.

H.C.P.

B.C.C.

15. The presence of sulphur in pig iron makes

It hard

It easily machinable

The casting unsound

It brittle

16. Tungsten in high speed steel provides

Wear resistance

Toughness

Hot hardness

Sharp cutting edge

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

1015

35

710

57

18. Argentite is the principal ore or raw material for

Tin

Aluminium

Silver

Zinc

19. Phosphor bronze contains

0.5% of phosphorous

None of the above

2.5% phosphorous

1% phosphorous

20. Shock resisting steels should have

Low tensile strength

Low hardness

Toughness

Low wear resistance

Page 3 of 4

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

RC 80

RC 65

RC 57

RC 48

22. Drop forging dies contain carbon of the order of

0.1 to 0.2%

0.25 to 0.5%

0.6 to 0.7%

0.7 to 0.9%

23. Permalloy is a

Kind of stainless steel

Polymer

Nickel and iron alloy having high permeability

None ferrous alloy

24. Carbon in iron is an example of

Interstitial solid solution

Substitutional solution

All of the above

Intermetallic compounds

25. 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

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

More

None of these

Less

Same

27. 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

28. Free cutting steels

Do not exist

Require least cutting force

Are used where ease in machining is the criterion

Contain carbon in free form

29. Connecting rod is usually made of

High carbon steel

Low carbon steel

Medium carbon steel

Aluminium

30. Weld decay is the phenomenon found with

Cast iron

Stainless steel

Nonferrous materials

Mild steel

Page 4 of 4

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

Improve toughness

Improve machinability

Release stresses

Improve ductility

32. The machinability of steel is increased by

Sulphur, graphite and aluminium

Phosphorous and aluminium

Silicon and sulphur

Phosphorous, lead and sulphur

33. 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

34. Corrosion resistance of steel is increased by adding

Chromium and nickel

Nickel and molybdenum

Aluminium and zinc

Tungsten and sulphur

35. Cupola produces following material

Malleable iron

Cast iron

Wrought iron

Pig iron

36. Bronze contains

70% copper and 30% zinc

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

90% copper and 10% tin

70 - 75% copper and rest tin

37. Chromium in steel

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

Improves cutting ability and reduces hardenability

Improves wear resistance, cutting ability and toughness

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

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

Chromium

Vanadium

Manganese

Nickel

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

Cobalt

Vanadium

Nickel

Iron

40. An example of amorphous material is

Zinc

Silver

Glass

Lead

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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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