Engineering Materials Practice Set-8

Page 1 of 4

1. Tungsten in high speed steel provides

Hot hardness

Toughness

Sharp cutting edge

Wear resistance

2. Steel made from phosphate iron is

Ductile

Hard

Tough

Brittle

3. Corrosion resistance of steel is increased by adding

Aluminium and zinc

Nickel and molybdenum

Tungsten and sulphur

Chromium and nickel

4. Carbon in iron is an example of

All of the above

Intermetallic compounds

Interstitial solid solution

Substitutional solution

5. Gun metal contains

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

90% copper and 10% tin

70% copper and 30% zinc

70 - 78% copper and rest tin

6. Phosphor bronze contains

2.5% phosphorous

0.5% of phosphorous

None of the above

1% phosphorous

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

0.2%

0.1%

0.6%

0.4%

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

60 : 40

50 : 50

40 : 60

10 : 90

9. Chromium in steel

Improves cutting ability and reduces hardenability

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

10. Permalloy is a

Nickel and iron alloy having high permeability

Polymer

Kind of stainless steel

None ferrous alloy

Page 2 of 4

11. The crystal structure of brass is

F.C.C.

H.C.P.

B.C.C.

Orthorhombic crystalline structure

12. The hardness of steel increases if it contains

Martensite

Cementite

Austenite

Pearlite

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

Less

More

Same

None of these

14. 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%

15. Preheating is essential in welding

Cast iron

All nonferrous materials

All of the above

High speed steel

16. The presence of sulphur in pig iron makes

It brittle

It hard

It easily machinable

The casting unsound

17. Argentite is the principal ore or raw material for

Aluminium

Tin

Zinc

Silver

18. 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

19. An example of amorphous material is

Lead

Zinc

Glass

Silver

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

RC 80

RC 48

RC 57

RC 65

Page 3 of 4

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

Bell metal

Babbitt metal

Bronze

Gun metal

22. Connecting rod is usually made of

Aluminium

Low carbon steel

Medium carbon steel

High carbon steel

23. Delta metal is an alloy of

Iron, lead and tin

Iron, aluminium and magnesium

Copper, zinc and iron

Iron, nickel and copper

24. Bronze contains

70% copper and 30% zinc

90% copper and 10% tin

70 - 75% copper and rest tin

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

25. 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%

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

Breaks with little permanent distortion

Can cut another metal

Can be drawn into wires

Can be rolled or hammered into thin sheets

27. Beryllium bronze has

(A) High yield point

(B) High fatigue limit

(C) Both (A) and (B)

(D) None of these

28. Shock resisting steels should have

Low hardness

Low tensile strength

Toughness

Low wear resistance

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

Nickel

Vanadium

Iron

Cobalt

30. Melting point of iron is

1601°C

1712°C

1489°C

1539°C

Page 4 of 4

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

710

57

35

1015

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

Nickel

Manganese

Vanadium

Chromium

33. Cupola produces following material

Cast iron

Pig iron

Wrought iron

Malleable iron

34. The machinability of steel is increased by

Sulphur, graphite and aluminium

Phosphorous, lead and sulphur

Phosphorous and aluminium

Silicon and sulphur

35. Perminvar alloy having constant permeability is an alloy of

Nickel, copper and iron

Nickel, copper and zinc

Iron, zinc and bismuth

Copper, nickel and antimony

36. Manganese in steel increases its

Ductility

Fluidity

Hardness

Tensile strength

37. Weld decay is the phenomenon found with

Mild steel

Nonferrous materials

Cast iron

Stainless steel

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

Elinvar

Magnin

Invar

Nichrome

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

Improve machinability

Release stresses

Improve ductility

Improve toughness

40. Free cutting steels

Are used where ease in machining is the criterion

Do not exist

Contain carbon in free form

Require least cutting force

Engineering Materials Practice Set-8

Related

Leave a ReplyCancel reply

Secured Payments

Protection

Engineering Materials Practice Set-8

Share this Now with Friends:

Related

Leave a ReplyCancel reply

Secured Payments

Protection