Engineering Materials Practice Set-8

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1. Manganese in steel increases its

Hardness

Ductility

Fluidity

Tensile strength

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

Magnin

Invar

Nichrome

Elinvar

3. The crystal structure of brass is

H.C.P.

F.C.C.

Orthorhombic crystalline structure

B.C.C.

4. Drop forging dies contain carbon of the order of

0.1 to 0.2%

0.25 to 0.5%

0.6 to 0.7%

0.7 to 0.9%

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

Cobalt

Vanadium

Iron

Nickel

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

Gun metal

Bell metal

Babbitt metal

Bronze

7. Free cutting steels

Are used where ease in machining is the criterion

Require least cutting force

Do not exist

Contain carbon in free form

8. Phosphor bronze contains

0.5% of phosphorous

1% phosphorous

None of the above

2.5% phosphorous

9. High carbon steel carries carbon percentage

0.1 to 0.3%

0.8 to 1.5%

0.6 to 0.8%

0.3 to 0.6%

10. Shock resisting steels should have

Low wear resistance

Low tensile strength

Toughness

Low hardness

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11. Steel made from phosphate iron is

Tough

Hard

Ductile

Brittle

12. The hardness of steel increases if it contains

Pearlite

Martensite

Austenite

Cementite

13. The machinability of steel is increased by

Phosphorous, lead and sulphur

Sulphur, graphite and aluminium

Silicon and sulphur

Phosphorous and aluminium

14. Permalloy is a

None ferrous alloy

Nickel and iron alloy having high permeability

Kind of stainless steel

Polymer

15. Delta metal is an alloy of

Iron, nickel and copper

Iron, aluminium and magnesium

Iron, lead and tin

Copper, zinc and iron

16. Sulphur in cast iron

Aids fusibility and fluidity

Makes the iron soft and easily machinable

Increases hardness and brittleness

Make the iron white and hard

17. Melting point of iron is

1539°C

1712°C

1601°C

1489°C

18. Preheating is essential in welding

Cast iron

All of the above

High speed steel

All nonferrous materials

19. Carbon in iron is an example of

Intermetallic compounds

Substitutional solution

Interstitial solid solution

All of the above

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

Improve toughness

Improve machinability

Improve ductility

Release stresses

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21. Argentite is the principal ore or raw material for

Zinc

Aluminium

Tin

Silver

22. Beryllium bronze has

(B) High fatigue limit

(A) High yield point

(D) None of these

(C) Both (A) and (B)

23. Weld decay is the phenomenon found with

Cast iron

Nonferrous materials

Mild steel

Stainless steel

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

Vanadium

Manganese

Chromium

Nickel

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

RC 65

RC 57

RC 48

RC 80

26. 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

27. The presence of sulphur in pig iron makes

It easily machinable

It hard

It brittle

The casting unsound

28. Gun metal contains

70% copper and 30% zinc

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

70 - 78% copper and rest tin

90% copper and 10% tin

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

40 : 60

50 : 50

10 : 90

60 : 40

30. Corrosion resistance of steel is increased by adding

Nickel and molybdenum

Tungsten and sulphur

Chromium and nickel

Aluminium and zinc

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31. Bronze contains

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

70 - 75% copper and rest tin

70% copper and 30% zinc

90% copper and 10% tin

32. 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

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

57

710

1015

35

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

None of these

Less

More

Same

35. Tungsten in high speed steel provides

Hot hardness

Toughness

Sharp cutting edge

Wear resistance

36. Connecting rod is usually made of

High carbon steel

Low carbon steel

Aluminium

Medium carbon steel

37. Cupola produces following material

Cast iron

Malleable iron

Wrought iron

Pig iron

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

0.1%

0.2%

0.4%

0.6%

39. Perminvar alloy having constant permeability is an alloy of

Nickel, copper and zinc

Copper, nickel and antimony

Nickel, copper and iron

Iron, zinc and bismuth

40. An example of amorphous material is

Silver

Lead

Glass

Zinc

Engineering Materials Practice Set-8

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