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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 machinability of steel is increased by

Sulphur, graphite and aluminium

Silicon and sulphur

Phosphorous, lead and sulphur

Phosphorous and aluminium

2. Free cutting steels

Do not exist

Are used where ease in machining is the criterion

Contain carbon in free form

Require least cutting force

3. The hardness of steel increases if it contains

Austenite

Martensite

Cementite

Pearlite

4. Cupola produces following material

Wrought iron

Malleable iron

Pig iron

Cast iron

5. Shock resisting steels should have

Low tensile strength

Low hardness

Toughness

Low wear resistance

6. Chromium in steel

Improves wear resistance, cutting ability and toughness

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

Improves cutting ability and reduces hardenability

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

7. 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

8. Corrosion resistance of steel is increased by adding

Chromium and nickel

Aluminium and zinc

Nickel and molybdenum

Tungsten and sulphur

9. Steel made from phosphate iron is

Brittle

Ductile

Hard

Tough

10. Delta metal is an alloy of

Iron, lead and tin

Iron, nickel and copper

Copper, zinc and iron

Iron, aluminium and magnesium

Page 2 of 4

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

None of these

More

Less

Same

12. Beryllium bronze has

(D) None of these

(C) Both (A) and (B)

(B) High fatigue limit

(A) High yield point

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

RC 65

RC 80

RC 57

RC 48

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

0.1%

0.2%

0.4%

0.6%

15. Phosphor bronze contains

None of the above

1% phosphorous

2.5% phosphorous

0.5% of phosphorous

16. Connecting rod is usually made of

High carbon steel

Aluminium

Medium carbon steel

Low carbon steel

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

Bell metal

Gun metal

Babbitt metal

Bronze

18. Manganese in steel increases its

Hardness

Ductility

Fluidity

Tensile strength

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

1015

710

57

35

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

Vanadium

Manganese

Nickel

Chromium

Page 3 of 4

21. Preheating is essential in welding

All of the above

High speed steel

Cast iron

All nonferrous materials

22. The crystal structure of brass is

H.C.P.

F.C.C.

B.C.C.

Orthorhombic crystalline structure

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

60 : 40

50 : 50

10 : 90

40 : 60

24. Perminvar alloy having constant permeability is an alloy of

Iron, zinc and bismuth

Nickel, copper and iron

Copper, nickel and antimony

Nickel, copper and zinc

25. Drop forging dies contain carbon of the order of

0.6 to 0.7%

0.1 to 0.2%

0.7 to 0.9%

0.25 to 0.5%

26. An example of amorphous material is

Silver

Zinc

Lead

Glass

27. Carbon in iron is an example of

Interstitial solid solution

Substitutional solution

Intermetallic compounds

All of the above

28. Melting point of iron is

1489°C

1601°C

1712°C

1539°C

29. 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

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

Magnin

Nichrome

Elinvar

Invar

Page 4 of 4

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

Release stresses

Improve machinability

Improve toughness

Improve ductility

32. The presence of sulphur in pig iron makes

The casting unsound

It easily machinable

It hard

It brittle

33. 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

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

Can be rolled or hammered into thin sheets

Breaks with little permanent distortion

Can cut another metal

Can be drawn into wires

35. Tungsten in high speed steel provides

Hot hardness

Sharp cutting edge

Wear resistance

Toughness

36. Argentite is the principal ore or raw material for

Silver

Tin

Aluminium

Zinc

37. High carbon steel carries carbon percentage

0.8 to 1.5%

0.6 to 0.8%

0.3 to 0.6%

0.1 to 0.3%

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

Cobalt

Vanadium

Nickel

Iron

39. Weld decay is the phenomenon found with

Mild steel

Cast iron

Nonferrous materials

Stainless steel

40. Permalloy is a

Polymer

Kind of stainless steel

Nickel and iron alloy having high permeability

None ferrous alloy

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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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