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Engineering Materials
0

Engineering Materials Practice Set-8

May 16, 2021

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Page 1 of 4

1. The presence of sulphur in pig iron makes

It easily machinable

It brittle

The casting unsound

It hard

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

Babbitt metal

Gun metal

Bell metal

Bronze

3. Connecting rod is usually made of

Low carbon steel

High carbon steel

Medium carbon steel

Aluminium

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

Less

Same

More

None of these

5. The hardness of steel increases if it contains

Austenite

Cementite

Pearlite

Martensite

6. Chromium in steel

Improves cutting ability and reduces hardenability

Improves wear resistance, cutting ability and toughness

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

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

7. The machinability of steel is increased by

Silicon and sulphur

Phosphorous and aluminium

Phosphorous, lead and sulphur

Sulphur, graphite and aluminium

8. Permalloy is a

Kind of stainless steel

Polymer

None ferrous alloy

Nickel and iron alloy having high permeability

9. Sulphur in cast iron

Make the iron white and hard

Aids fusibility and fluidity

Makes the iron soft and easily machinable

Increases hardness and brittleness

10. Bronze contains

70 - 75% 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

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

90% copper and 10% tin

70% copper and 30% zinc

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

50 : 50

10 : 90

40 : 60

60 : 40

13. The crystal structure of brass is

Orthorhombic crystalline structure

H.C.P.

B.C.C.

F.C.C.

14. An example of amorphous material is

Lead

Silver

Zinc

Glass

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

Nickel

Iron

Cobalt

Vanadium

16. High carbon steel carries carbon percentage

0.8 to 1.5%

0.1 to 0.3%

0.3 to 0.6%

0.6 to 0.8%

17. Perminvar alloy having constant permeability is an alloy of

Copper, nickel and antimony

Nickel, copper and iron

Iron, zinc and bismuth

Nickel, copper and zinc

18. Steel made from phosphate iron is

Tough

Hard

Brittle

Ductile

19. Free cutting steels

Do not exist

Are used where ease in machining is the criterion

Contain carbon in free form

Require least cutting force

20. Phosphor bronze contains

2.5% phosphorous

None of the above

1% phosphorous

0.5% of phosphorous

Page 3 of 4

21. Carbon in iron is an example of

Interstitial solid solution

Intermetallic compounds

Substitutional solution

All of the above

22. Beryllium bronze has

(B) High fatigue limit

(A) High yield point

(D) None of these

(C) Both (A) and (B)

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

0.2%

0.4%

0.6%

0.1%

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

RC 80

RC 48

RC 65

RC 57

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

Chromium

Manganese

Vanadium

Nickel

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

Improve toughness

Improve machinability

Release stresses

Improve ductility

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

Nichrome

Invar

Magnin

Elinvar

28. 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

29. Preheating is essential in welding

All nonferrous materials

All of the above

High speed steel

Cast iron

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

1015

710

35

57

Page 4 of 4

31. Manganese in steel increases its

Fluidity

Tensile strength

Ductility

Hardness

32. Shock resisting steels should have

Low hardness

Low tensile strength

Toughness

Low wear resistance

33. Delta metal is an alloy of

Iron, lead and tin

Iron, nickel and copper

Iron, aluminium and magnesium

Copper, zinc and iron

34. Drop forging dies contain carbon of the order of

0.1 to 0.2%

0.25 to 0.5%

0.7 to 0.9%

0.6 to 0.7%

35. Tungsten in high speed steel provides

Wear resistance

Toughness

Sharp cutting edge

Hot hardness

36. Weld decay is the phenomenon found with

Stainless steel

Cast iron

Nonferrous materials

Mild steel

37. Argentite is the principal ore or raw material for

Tin

Aluminium

Silver

Zinc

38. Corrosion resistance of steel is increased by adding

Chromium and nickel

Nickel and molybdenum

Tungsten and sulphur

Aluminium and zinc

39. Melting point of iron is

1539°C

1712°C

1601°C

1489°C

40. Cupola produces following material

Malleable iron

Cast iron

Wrought iron

Pig iron

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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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