Engineering Materials Practice Set-8

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

Vanadium

Cobalt

Iron

Nickel

2. The machinability of steel is increased by

Silicon and sulphur

Phosphorous and aluminium

Sulphur, graphite and aluminium

Phosphorous, lead and sulphur

3. Carbon in iron is an example of

All of the above

Interstitial solid solution

Substitutional solution

Intermetallic compounds

4. High carbon steel carries carbon percentage

0.3 to 0.6%

0.1 to 0.3%

0.8 to 1.5%

0.6 to 0.8%

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

710

35

57

1015

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

0.2%

0.6%

0.4%

0.1%

7. Perminvar alloy having constant permeability is an alloy of

Nickel, copper and zinc

Nickel, copper and iron

Copper, nickel and antimony

Iron, zinc and bismuth

8. The presence of sulphur in pig iron makes

It easily machinable

The casting unsound

It brittle

It hard

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

Improve toughness

Improve ductility

Release stresses

Improve machinability

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

Less

None of these

More

Same

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

Can be drawn into wires

Can cut another metal

Can be rolled or hammered into thin sheets

Breaks with little permanent distortion

12. Argentite is the principal ore or raw material for

Tin

Zinc

Aluminium

Silver

13. Weld decay is the phenomenon found with

Mild steel

Nonferrous materials

Stainless steel

Cast iron

14. Shock resisting steels should have

Low tensile strength

Toughness

Low hardness

Low wear resistance

15. Free cutting steels

Are used where ease in machining is the criterion

Do not exist

Contain carbon in free form

Require least cutting force

16. Preheating is essential in welding

Cast iron

All nonferrous materials

All of the above

High speed steel

17. An example of amorphous material is

Lead

Glass

Zinc

Silver

18. Drop forging dies contain carbon of the order of

0.1 to 0.2%

0.6 to 0.7%

0.7 to 0.9%

0.25 to 0.5%

19. Manganese in steel increases its

Ductility

Hardness

Tensile strength

Fluidity

20. Delta metal is an alloy of

Iron, lead and tin

Copper, zinc and iron

Iron, aluminium and magnesium

Iron, nickel and copper

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21. The hardness of steel increases if it contains

Martensite

Cementite

Pearlite

Austenite

22. Sulphur in cast iron

Aids fusibility and fluidity

Make the iron white and hard

Increases hardness and brittleness

Makes the iron soft and easily machinable

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

Bell metal

Bronze

Babbitt metal

Gun metal

24. Melting point of iron is

1601°C

1489°C

1539°C

1712°C

25. The crystal structure of brass is

H.C.P.

Orthorhombic crystalline structure

F.C.C.

B.C.C.

26. Corrosion resistance of steel is increased by adding

Chromium and nickel

Nickel and molybdenum

Tungsten and sulphur

Aluminium and zinc

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

10 : 90

40 : 60

60 : 40

50 : 50

28. Beryllium bronze has

(B) High fatigue limit

(D) None of these

(C) Both (A) and (B)

(A) High yield point

29. Chromium in steel

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

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

Improves cutting ability and reduces hardenability

Improves wear resistance, cutting ability and toughness

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

Nickel

Manganese

Chromium

Vanadium

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31. Steel made from phosphate iron is

Tough

Ductile

Brittle

Hard

32. Connecting rod is usually made of

High carbon steel

Aluminium

Medium carbon steel

Low carbon steel

33. Cupola produces following material

Malleable iron

Wrought iron

Cast iron

Pig iron

34. Bronze contains

90% copper and 10% tin

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

70 - 75% copper and rest tin

70% copper and 30% zinc

35. Phosphor bronze contains

None of the above

0.5% of phosphorous

1% phosphorous

2.5% phosphorous

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

Elinvar

Nichrome

Invar

Magnin

37. Permalloy is a

Polymer

Nickel and iron alloy having high permeability

Kind of stainless steel

None ferrous alloy

38. Gun metal contains

70% copper and 30% zinc

70 - 78% copper and rest tin

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

90% copper and 10% tin

39. Tungsten in high speed steel provides

Toughness

Sharp cutting edge

Wear resistance

Hot hardness

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

RC 48

RC 57

RC 80

RC 65

Engineering Materials Practice Set-8

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