Engineering Materials Practice Set-7

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1. Ball bearings are, usually, made from

High carbon steel

Low carbon steel

Medium carbon steel

Chrome steel

2. Blast furnace is used to produce

Cast iron

Wrought iron

Pig iron

Steel

3. Induction hardening is the process of

Increasing hardness throughout

Inducing hardness by continuous process

Heating and cooling rapidly

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

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

Cobalt

Vanadium

Chromium

Nickel

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

Brittleness

Plasticity

Malleability

Ductility

6. Process of Austempering results in

Martenistic structure

Lamellar layers of carbide distributed throughout the structure

Formation of bainite structure

Carburised structure

7. Corrosion resistance of steel is increased by addition of

Vanadium, aluminium

Sulphur, phosphorus, lead

Tungsten, molybdenum, vanadium, chromium

Chromium and nickel

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

Anisotropic

Ductile

Malleable

Homogeneous

9. The blade of a power saw is made of

Boron steel

Malleable cast iron

Stainless steel

High speed steel

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

Externally applied forces with breakdown or yielding

Fracture due to high impact loads

Deformation under stress

None of these

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

Carbon

Vanadium

Manganese

Cobalt

12. Machining properties of steel are improved by adding

Sulphur, lead, phosphorous

Silicon, aluminium, titanium

Chromium, nickel

Vanadium, aluminium

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

Muntz metal

Bronze

Brass

Gun metal

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

(A) Cementite

(D) None of these

(C) Both ‘A’ and ‘B’

(B) Free graphite

15. Railway rails are normally made of

Tungsten steel

Alloy steel

Mild steel

High carbon

16. Free carbon in iron makes the metal

Hard and gives a fine grained crystalline structure

Soft and gives a coarse grained crystalline structure

Soft and gives a fine grained crystalline structure

Hard and gives a coarse grained crystalline structure

17. Iron ore is usually found in the form of

Oxides

Sulphides

All of these

Carbonates

18. Eutectoid steel contains following percentage of carbon

0.8%

0.63%

0.02%

0.3%

19. Hardness of steel depends on

Contents of alloying elements

The shape and distribution of the carbides in iron

Method of fabrication

Amount of carbon it contains

20. Inconel is an alloy of

Nickel, copper

Nickel, chromium and iron

Nickel, Chromium

Nickel, zinc

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

All of these

Magnet steel

Alloy and carbon tool steel

High speed tool steel

22. Quenching is not necessary when hardening is done by

Flame hardening

Case hardening

Nitriding

Any one of these

23. The hardness of steel depends upon the

Amount of carbon it contains

Method of manufacture of steel

Contents of alloying elements

Amount of cementite it contains

24. German silver is an alloy of

Nickel and copper

Silver and some impurities

Refined silver

Nickel, Copper and zinc

25. A cold chisel is made of

Cast iron

Mild steel

H.S.S

High carbon

26. German silver contains

1% silver

5% silver

No silver

2% silver

27. Maximum percentage of carbon in ferrite is

0.1%

0.25%

0.025%

0.06%

28. The carbon in the pig iron varies from

0.5 to 1%

1 to 5%

0.1 to 0.5%

5 to 10%

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

Boeschinger effect

Hysteresis

Creep

Visco elasticity

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

Hastelloy

Duralumin

Invar

Silver metal

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31. Hardness of martensite is about

RC 80

RC 48

RC 65

RC 57

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

Chromium

Tungsten

Vanadium

Nickel

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

High speed steel

Nickel steel

Stainless steel

Heat resisting steel

34. Cyaniding is the process of

Dipping steel in cyanide bath

Obtaining cyanide salts

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

Reacting steel surface with cyanide salts

35. An engineer's hammer is made of

Mild steel

Forged steel

High carbon steel

Cast iron

36. Shock resistance of steel is increased by adding

Chromium

Nickel

Sulphur, lead and phosphorus

Nickel and chromium

37. Solder is an alloy consisting of

Tin and copper

Tin and lead

Lead and zinc

Tin, antimony, copper

38. The basic constituents of Hastelloy are

Aluminium, copper etc.

All of the above

Nickel, molybdenum etc.

Nickel, Copper, etc.

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

Lowers

Raises

Does not effect

None of these

40. Basic constituents of Monel metal are

Zinc, tin, lead

Nickel, molybdenum

Nickel, lead and tin

Nickel, copper

Engineering Materials Practice Set-7

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