Engineering Materials Practice Set-7

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

All of these

Alloy and carbon tool steel

High speed tool steel

Magnet steel

2. Iron ore is usually found in the form of

Carbonates

Sulphides

All of these

Oxides

3. Eutectoid steel contains following percentage of carbon

0.02%

0.3%

0.63%

0.8%

4. Blast furnace is used to produce

Cast iron

Steel

Wrought iron

Pig iron

5. Railway rails are normally made of

Tungsten steel

Alloy steel

High carbon

Mild steel

6. The carbon in the pig iron varies from

1 to 5%

0.1 to 0.5%

0.5 to 1%

5 to 10%

7. Free carbon in iron makes the metal

Hard and gives a fine grained crystalline structure

Soft and gives a fine grained crystalline structure

Soft and gives a coarse grained crystalline structure

Hard and gives a coarse grained crystalline structure

8. Maximum percentage of carbon in ferrite is

0.025%

0.06%

0.1%

0.25%

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

Hastelloy

Silver metal

Duralumin

Invar

10. An engineer's hammer is made of

Forged steel

Cast iron

Mild steel

High carbon steel

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11. Machining properties of steel are improved by adding

Silicon, aluminium, titanium

Vanadium, aluminium

Sulphur, lead, phosphorous

Chromium, nickel

12. Shock resistance of steel is increased by adding

Nickel and chromium

Sulphur, lead and phosphorus

Chromium

Nickel

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

Cobalt

Nickel

Chromium

Vanadium

14. Cyaniding is the process of

Obtaining cyanide salts

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

Reacting steel surface with cyanide salts

Dipping steel in cyanide bath

15. Inconel is an alloy of

Nickel, copper

Nickel, chromium and iron

Nickel, zinc

Nickel, Chromium

16. 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

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

Tungsten

Nickel

Chromium

Vanadium

18. Corrosion resistance of steel is increased by addition of

Chromium and nickel

Sulphur, phosphorus, lead

Vanadium, aluminium

Tungsten, molybdenum, vanadium, chromium

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

None of these

Raises

Lowers

Does not effect

20. Ball bearings are, usually, made from

Low carbon steel

High carbon steel

Medium carbon steel

Chrome steel

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21. Quenching is not necessary when hardening is done by

Nitriding

Flame hardening

Case hardening

Any one of these

22. The blade of a power saw is made of

Stainless steel

High speed steel

Malleable cast iron

Boron steel

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

Heat resisting steel

Nickel steel

Stainless steel

High speed steel

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

Ductility

Brittleness

Plasticity

Malleability

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

Homogeneous

Ductile

Anisotropic

Malleable

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

Fracture due to high impact loads

None of these

Externally applied forces with breakdown or yielding

Deformation under stress

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

Creep

Hysteresis

Boeschinger effect

Visco elasticity

28. The hardness of steel depends upon the

Amount of cementite it contains

Amount of carbon it contains

Method of manufacture of steel

Contents of alloying elements

29. German silver contains

No silver

5% silver

2% silver

1% silver

30. A cold chisel is made of

High carbon

H.S.S

Mild steel

Cast iron

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

(C) Both ‘A’ and ‘B’

(B) Free graphite

(D) None of these

(A) Cementite

32. Hardness of steel depends on

Contents of alloying elements

Amount of carbon it contains

Method of fabrication

The shape and distribution of the carbides in iron

33. Basic constituents of Monel metal are

Nickel, copper

Nickel, lead and tin

Zinc, tin, lead

Nickel, molybdenum

34. German silver is an alloy of

Nickel, Copper and zinc

Nickel and copper

Silver and some impurities

Refined silver

35. Process of Austempering results in

Formation of bainite structure

Carburised structure

Lamellar layers of carbide distributed throughout the structure

Martenistic structure

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

Brass

Gun metal

Bronze

Muntz metal

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

Manganese

Vanadium

Carbon

Cobalt

38. The basic constituents of Hastelloy are

Nickel, Copper, etc.

Aluminium, copper etc.

All of the above

Nickel, molybdenum etc.

39. Hardness of martensite is about

RC 48

RC 65

RC 80

RC 57

40. Solder is an alloy consisting of

Tin and copper

Lead and zinc

Tin and lead

Tin, antimony, copper

Engineering Materials Practice Set-7

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