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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

Brittle

Hard

Ductile

Tough

2. Manganese in steel increases its

Tensile strength

Fluidity

Hardness

Ductility

3. Sulphur in cast iron

Makes the iron soft and easily machinable

Increases hardness and brittleness

Aids fusibility and fluidity

Make the iron white and hard

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

57

1015

710

35

5. Weld decay is the phenomenon found with

Stainless steel

Mild steel

Nonferrous materials

Cast iron

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

0.1%

0.6%

0.4%

0.2%

7. The crystal structure of brass is

F.C.C.

B.C.C.

H.C.P.

Orthorhombic crystalline structure

8. High carbon steel carries carbon percentage

0.3 to 0.6%

0.6 to 0.8%

0.1 to 0.3%

0.8 to 1.5%

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

RC 48

RC 80

RC 65

RC 57

10. Perminvar alloy having constant permeability is an alloy of

Iron, zinc and bismuth

Nickel, copper and zinc

Copper, nickel and antimony

Nickel, copper and iron

Page 2 of 4

11. Permalloy is a

None ferrous alloy

Polymer

Nickel and iron alloy having high permeability

Kind of stainless steel

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

Cobalt

Iron

Nickel

Vanadium

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

Release stresses

Improve toughness

Improve ductility

Improve machinability

14. Shock resisting steels should have

Low wear resistance

Low tensile strength

Low hardness

Toughness

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

Elinvar

Invar

Magnin

Nichrome

16. Free cutting steels

Require least cutting force

Contain carbon in free form

Do not exist

Are used where ease in machining is the criterion

17. An example of amorphous material is

Silver

Zinc

Lead

Glass

18. 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%

19. Carbon in iron is an example of

Interstitial solid solution

Substitutional solution

Intermetallic compounds

All of the above

20. Corrosion resistance of steel is increased by adding

Nickel and molybdenum

Tungsten and sulphur

Chromium and nickel

Aluminium and zinc

Page 3 of 4

21. Beryllium bronze has

(A) High yield point

(B) High fatigue limit

(C) Both (A) and (B)

(D) None of these

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

50 : 50

60 : 40

10 : 90

40 : 60

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

Same

More

Less

None of these

24. Cupola produces following material

Cast iron

Wrought iron

Malleable iron

Pig iron

25. Preheating is essential in welding

All nonferrous materials

All of the above

Cast iron

High speed steel

26. Bronze contains

90% copper and 10% tin

70% copper and 30% zinc

70 - 75% copper and rest tin

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

27. The machinability of steel is increased by

Phosphorous, lead and sulphur

Sulphur, graphite and aluminium

Phosphorous and aluminium

Silicon and sulphur

28. Argentite is the principal ore or raw material for

Silver

Aluminium

Tin

Zinc

29. Chromium in steel

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

Improves cutting ability and reduces hardenability

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

Improves wear resistance, cutting ability and toughness

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

Nickel

Chromium

Manganese

Vanadium

Page 4 of 4

31. Connecting rod is usually made of

Aluminium

High carbon steel

Low carbon steel

Medium carbon steel

32. Tungsten in high speed steel provides

Toughness

Sharp cutting edge

Hot hardness

Wear resistance

33. Gun metal contains

70 - 78% copper and rest tin

90% copper and 10% tin

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

70% copper and 30% zinc

34. The hardness of steel increases if it contains

Cementite

Martensite

Pearlite

Austenite

35. Delta metal is an alloy of

Iron, aluminium and magnesium

Iron, lead and tin

Iron, nickel and copper

Copper, zinc and iron

36. The presence of sulphur in pig iron makes

It hard

The casting unsound

It easily machinable

It brittle

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

Can be drawn into wires

Breaks with little permanent distortion

Can be rolled or hammered into thin sheets

Can cut another metal

38. Melting point of iron is

1712°C

1601°C

1489°C

1539°C

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

Bronze

Babbitt metal

Bell metal

Gun metal

40. Phosphor bronze contains

1% phosphorous

0.5% of phosphorous

None of the above

2.5% phosphorous

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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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