Engineering Materials Practice Set-7

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1. Ball bearings are, usually, made from

Low carbon steel

High carbon steel

Chrome steel

Medium carbon steel

2. Railway rails are normally made of

Tungsten steel

High carbon

Alloy steel

Mild steel

3. German silver contains

1% silver

2% silver

5% silver

No silver

4. Corrosion resistance of steel is increased by addition of

Chromium and nickel

Vanadium, aluminium

Sulphur, phosphorus, lead

Tungsten, molybdenum, vanadium, chromium

5. An alloy of copper, tin and zinc is known as

Brass

Gun metal

Muntz metal

Bronze

6. Hardness of steel depends on

Amount of carbon it contains

The shape and distribution of the carbides in iron

Method of fabrication

Contents of alloying elements

7. The loss of strength in compression with simultaneous gain in strength in tension due to overloading is known as

Visco elasticity

Boeschinger effect

Creep

Hysteresis

8. Eutectoid steel contains following percentage of carbon

0.8%

0.3%

0.02%

0.63%

9. Surveying tapes are made of a material having low coefficient of expansion and enough strength. The alloy used is

Invar

Silver metal

Hastelloy

Duralumin

10. Tungsten when added to steel __________ the critical temperature.

Lowers

Does not effect

Raises

None of these

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11. The blade of a power saw is made of

Boron steel

High speed steel

Malleable cast iron

Stainless steel

12. Hardness of martensite is about

RC 65

RC 48

RC 80

RC 57

13. Induction hardening is the process of

Hardening surface of work-piece to obtain hard and wear resistant surface

Inducing hardness by continuous process

Increasing hardness throughout

Heating and cooling rapidly

14. Free carbon in iron makes the metal

Hard and gives a coarse grained crystalline structure

Hard and gives a fine grained crystalline structure

Soft and gives a coarse grained crystalline structure

Soft and gives a fine grained crystalline structure

15. The carbon in the pig iron varies from

5 to 10%

0.1 to 0.5%

1 to 5%

0.5 to 1%

16. An engineer's hammer is made of

Forged steel

Mild steel

Cast iron

High carbon steel

17. A cold chisel is made of

H.S.S

Mild steel

Cast iron

High carbon

18. The property of a material due to which it breaks with little permanent distortion, is called

Plasticity

Ductility

Brittleness

Malleability

19. Blast furnace is used to produce

Cast iron

Wrought iron

Pig iron

Steel

20. The alloying element which increases residual magnetism and coercive magnetic force in steel for magnets is

Vanadium

Nickel

Cobalt

Chromium

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21. The material widely used for making pendulums of clocks is

Stainless steel

Nickel steel

Heat resisting steel

High speed steel

22. Machining properties of steel are improved by adding

Sulphur, lead, phosphorous

Silicon, aluminium, titanium

Vanadium, aluminium

Chromium, nickel

23. The electric process of steel making is especially adapted to

All of these

Alloy and carbon tool steel

Magnet steel

High speed tool steel

24. Quenching is not necessary when hardening is done by

Nitriding

Any one of these

Case hardening

Flame hardening

25. Process of Austempering results in

Carburised structure

Martenistic structure

Formation of bainite structure

Lamellar layers of carbide distributed throughout the structure

26. Iron ore is usually found in the form of

All of these

Oxides

Carbonates

Sulphides

27. Shock resistance of steel is increased by adding

Nickel

Nickel and chromium

Sulphur, lead and phosphorus

Chromium

28. Cyaniding is the process of

Reacting steel surface with cyanide salts

Adding carbon and nitrogen by heat treatment of steel to increase its surface hardness

Obtaining cyanide salts

Dipping steel in cyanide bath

29. German silver is an alloy of

Nickel, Copper and zinc

Silver and some impurities

Refined silver

Nickel and copper

30. The basic constituents of Hastelloy are

All of the above

Aluminium, copper etc.

Nickel, Copper, etc.

Nickel, molybdenum etc.

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31. Basic constituents of Monel metal are

Nickel, molybdenum

Nickel, lead and tin

Zinc, tin, lead

Nickel, copper

32. The most effective inhibitor of grain growth, when added in small quantities is

Carbon

Vanadium

Cobalt

Manganese

33. Depth of hardness of steel is increased by addition of

Nickel

Chromium

Tungsten

Vanadium

34. Solder is an alloy consisting of

Tin and copper

Tin and lead

Lead and zinc

Tin, antimony, copper

35. Inconel is an alloy of

Nickel, copper

Nickel, Chromium

Nickel, chromium and iron

Nickel, zinc

36. The strength is the ability of a material to resist

Externally applied forces with breakdown or yielding

None of these

Deformation under stress

Fracture due to high impact loads

37. When filing or machining cast iron makes our hands black, then it shows that ________ is present in cast iron.

(C) Both ‘A’ and ‘B’

(A) Cementite

(D) None of these

(B) Free graphite

38. By severely deforming a metal in a particular direction it becomes

Anisotropic

Malleable

Ductile

Homogeneous

39. The hardness of steel depends upon the

Amount of cementite it contains

Contents of alloying elements

Amount of carbon it contains

Method of manufacture of steel

40. Maximum percentage of carbon in ferrite is

0.25%

0.025%

0.1%

0.06%

Engineering Materials Practice Set-7

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