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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. Steel made from phosphate iron is

Hard

Ductile

Tough

Brittle

2. An example of amorphous material is

Glass

Zinc

Silver

Lead

3. Manganese in steel increases its

Fluidity

Tensile strength

Hardness

Ductility

4. Delta metal is an alloy of

Iron, nickel and copper

Iron, lead and tin

Copper, zinc and iron

Iron, aluminium and magnesium

5. Bronze contains

90% copper and 10% tin

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

70 - 75% copper and rest tin

70% copper and 30% zinc

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

Same

None of these

Less

More

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

Elinvar

Nichrome

Invar

Magnin

8. Connecting rod is usually made of

Low carbon steel

High carbon steel

Medium carbon steel

Aluminium

9. Weld decay is the phenomenon found with

Mild steel

Cast iron

Nonferrous materials

Stainless steel

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

Cobalt

Iron

Nickel

Vanadium

Page 2 of 4

11. Argentite is the principal ore or raw material for

Aluminium

Tin

Zinc

Silver

12. Preheating is essential in welding

High speed steel

All of the above

Cast iron

All nonferrous materials

13. 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

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

Improves cutting ability and reduces hardenability

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

40 : 60

60 : 40

10 : 90

50 : 50

15. High carbon steel carries carbon percentage

0.3 to 0.6%

0.1 to 0.3%

0.8 to 1.5%

0.6 to 0.8%

16. Shock resisting steels should have

Low wear resistance

Low tensile strength

Low hardness

Toughness

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

Can be rolled or hammered into thin sheets

Can cut another metal

Breaks with little permanent distortion

Can be drawn into wires

18. Free cutting steels

Do not exist

Contain carbon in free form

Are used where ease in machining is the criterion

Require least cutting force

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

35

1015

57

710

20. Corrosion resistance of steel is increased by adding

Tungsten and sulphur

Chromium and nickel

Nickel and molybdenum

Aluminium and zinc

Page 3 of 4

21. Sulphur in cast iron

Makes the iron soft and easily machinable

Increases hardness and brittleness

Make the iron white and hard

Aids fusibility and fluidity

22. The crystal structure of brass is

B.C.C.

Orthorhombic crystalline structure

F.C.C.

H.C.P.

23. The hardness of steel increases if it contains

Martensite

Austenite

Cementite

Pearlite

24. Carbon in iron is an example of

All of the above

Intermetallic compounds

Substitutional solution

Interstitial solid solution

25. Permalloy is a

Polymer

None ferrous alloy

Kind of stainless steel

Nickel and iron alloy having high permeability

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

RC 57

RC 80

RC 48

RC 65

27. Cupola produces following material

Pig iron

Wrought iron

Cast iron

Malleable iron

28. Phosphor bronze contains

0.5% of phosphorous

None of the above

2.5% phosphorous

1% phosphorous

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

Manganese

Vanadium

Nickel

Chromium

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

0.2%

0.4%

0.6%

0.1%

Page 4 of 4

31. Perminvar alloy having constant permeability is an alloy of

Copper, nickel and antimony

Nickel, copper and zinc

Iron, zinc and bismuth

Nickel, copper and iron

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

Bell metal

Babbitt metal

Bronze

Gun metal

33. Tungsten in high speed steel provides

Hot hardness

Wear resistance

Toughness

Sharp cutting edge

34. Drop forging dies contain carbon of the order of

0.6 to 0.7%

0.1 to 0.2%

0.25 to 0.5%

0.7 to 0.9%

35. Gun metal contains

70% copper and 30% zinc

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

90% copper and 10% tin

70 - 78% copper and rest tin

36. Melting point of iron is

1489°C

1712°C

1539°C

1601°C

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

Release stresses

Improve toughness

Improve machinability

Improve ductility

38. The presence of sulphur in pig iron makes

It brittle

It easily machinable

The casting unsound

It hard

39. The machinability of steel is increased by

Phosphorous, lead and sulphur

Silicon and sulphur

Sulphur, graphite and aluminium

Phosphorous and aluminium

40. Beryllium bronze has

(B) High fatigue limit

(D) None of these

(A) High yield point

(C) Both (A) and (B)

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VideRime

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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