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Engineering Materials
0

Engineering Materials Practice Set-8

May 16, 2021

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Page 1 of 4

1. Manganese in steel increases its

Tensile strength

Ductility

Hardness

Fluidity

2. Cupola produces following material

Wrought iron

Cast iron

Pig iron

Malleable iron

3. Melting point of iron is

1712°C

1489°C

1539°C

1601°C

4. Drop forging dies contain carbon of the order of

0.7 to 0.9%

0.1 to 0.2%

0.6 to 0.7%

0.25 to 0.5%

5. Carbon in iron is an example of

All of the above

Interstitial solid solution

Substitutional solution

Intermetallic compounds

6. Sulphur in cast iron

Makes the iron soft and easily machinable

Aids fusibility and fluidity

Make the iron white and hard

Increases hardness and brittleness

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

0.4%

0.2%

0.6%

0.1%

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

Elinvar

Magnin

Invar

Nichrome

9. Preheating is essential in welding

Cast iron

All nonferrous materials

High speed steel

All of the above

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

Improve machinability

Release stresses

Improve ductility

Improve toughness

Page 2 of 4

11. Corrosion resistance of steel is increased by adding

Tungsten and sulphur

Chromium and nickel

Aluminium and zinc

Nickel and molybdenum

12. Phosphor bronze contains

0.5% of phosphorous

1% phosphorous

2.5% phosphorous

None of the above

13. 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

14. High carbon steel carries carbon percentage

0.3 to 0.6%

0.8 to 1.5%

0.6 to 0.8%

0.1 to 0.3%

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

10 : 90

40 : 60

50 : 50

60 : 40

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

Same

Less

None of these

More

17. Weld decay is the phenomenon found with

Nonferrous materials

Mild steel

Cast iron

Stainless steel

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

Can cut another metal

Can be rolled or hammered into thin sheets

Breaks with little permanent distortion

Can be drawn into wires

19. Tungsten in high speed steel provides

Wear resistance

Sharp cutting edge

Toughness

Hot hardness

20. Shock resisting steels should have

Low hardness

Low wear resistance

Toughness

Low tensile strength

Page 3 of 4

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

57

710

1015

35

22. Perminvar alloy having constant permeability is an alloy of

Nickel, copper and zinc

Nickel, copper and iron

Iron, zinc and bismuth

Copper, nickel and antimony

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

Vanadium

Nickel

Cobalt

Iron

24. Permalloy is a

None ferrous alloy

Kind of stainless steel

Polymer

Nickel and iron alloy having high permeability

25. Connecting rod is usually made of

Low carbon steel

Aluminium

High carbon steel

Medium carbon steel

26. The machinability of steel is increased by

Sulphur, graphite and aluminium

Phosphorous and aluminium

Phosphorous, lead and sulphur

Silicon and sulphur

27. The hardness of steel increases if it contains

Pearlite

Cementite

Austenite

Martensite

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

RC 57

RC 48

RC 80

RC 65

29. An example of amorphous material is

Zinc

Silver

Lead

Glass

30. Gun metal contains

70% copper and 30% zinc

90% copper and 10% tin

70 - 78% copper and rest tin

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

Page 4 of 4

31. Delta metal is an alloy of

Copper, zinc and iron

Iron, nickel and copper

Iron, lead and tin

Iron, aluminium and magnesium

32. Steel made from phosphate iron is

Hard

Ductile

Tough

Brittle

33. Argentite is the principal ore or raw material for

Aluminium

Zinc

Tin

Silver

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

Gun metal

Bell metal

Babbitt metal

Bronze

35. Chromium in steel

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

Improves wear resistance, cutting ability and toughness

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

Improves cutting ability and reduces hardenability

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

Nickel

Vanadium

Manganese

Chromium

37. The crystal structure of brass is

H.C.P.

F.C.C.

Orthorhombic crystalline structure

B.C.C.

38. Free cutting steels

Require least cutting force

Are used where ease in machining is the criterion

Do not exist

Contain carbon in free form

39. Beryllium bronze has

(A) High yield point

(B) High fatigue limit

(D) None of these

(C) Both (A) and (B)

40. The presence of sulphur in pig iron makes

It brittle

It easily machinable

It hard

The casting unsound

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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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