Engineering Materials Practice Set-7

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

Manganese

Carbon

Vanadium

Cobalt

2. Iron ore is usually found in the form of

All of these

Oxides

Carbonates

Sulphides

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

Heat resisting steel

High speed steel

Stainless steel

Nickel steel

4. Cyaniding is the process of

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

Obtaining cyanide salts

Reacting steel surface with cyanide salts

Dipping steel in cyanide bath

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

(B) Free graphite

(A) Cementite

(D) None of these

(C) Both ‘A’ and ‘B’

6. Eutectoid steel contains following percentage of carbon

0.8%

0.02%

0.63%

0.3%

7. German silver is an alloy of

Silver and some impurities

Refined silver

Nickel and copper

Nickel, Copper and zinc

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

Fracture due to high impact loads

Deformation under stress

None of these

Externally applied forces with breakdown or yielding

9. Shock resistance of steel is increased by adding

Nickel and chromium

Chromium

Nickel

Sulphur, lead and phosphorus

10. Induction hardening is the process of

Heating and cooling rapidly

Inducing hardness by continuous process

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

Increasing hardness throughout

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11. Process of Austempering results in

Lamellar layers of carbide distributed throughout the structure

Carburised structure

Martenistic structure

Formation of bainite structure

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

Hastelloy

Invar

Silver metal

Duralumin

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

Chromium

Cobalt

Nickel

Vanadium

14. Maximum percentage of carbon in ferrite is

0.25%

0.06%

0.025%

0.1%

15. Free carbon in iron makes the metal

Hard and gives a fine grained crystalline structure

Hard and gives a coarse grained crystalline structure

Soft and gives a fine grained crystalline structure

Soft and gives a coarse grained crystalline structure

16. Ball bearings are, usually, made from

Medium carbon steel

Low carbon steel

High carbon steel

Chrome steel

17. Quenching is not necessary when hardening is done by

Case hardening

Any one of these

Flame hardening

Nitriding

18. Corrosion resistance of steel is increased by addition of

Chromium and nickel

Vanadium, aluminium

Sulphur, phosphorus, lead

Tungsten, molybdenum, vanadium, chromium

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

Malleable

Ductile

Anisotropic

Homogeneous

20. An engineer's hammer is made of

Mild steel

Cast iron

Forged steel

High carbon steel

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21. Basic constituents of Monel metal are

Zinc, tin, lead

Nickel, copper

Nickel, molybdenum

Nickel, lead and tin

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

Nickel

Chromium

Vanadium

Tungsten

23. The hardness of steel depends upon the

Method of manufacture of steel

Contents of alloying elements

Amount of cementite it contains

Amount of carbon it contains

24. German silver contains

1% silver

No silver

2% silver

5% silver

25. Machining properties of steel are improved by adding

Sulphur, lead, phosphorous

Chromium, nickel

Silicon, aluminium, titanium

Vanadium, aluminium

26. The blade of a power saw is made of

Stainless steel

Malleable cast iron

High speed steel

Boron steel

27. Inconel is an alloy of

Nickel, Chromium

Nickel, zinc

Nickel, copper

Nickel, chromium and iron

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

Hysteresis

Visco elasticity

Boeschinger effect

Creep

29. Hardness of martensite is about

RC 57

RC 80

RC 48

RC 65

30. Solder is an alloy consisting of

Tin and lead

Tin and copper

Tin, antimony, copper

Lead and zinc

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

Raises

None of these

Does not effect

Lowers

32. A cold chisel is made of

Cast iron

High carbon

Mild steel

H.S.S

33. The carbon in the pig iron varies from

1 to 5%

5 to 10%

0.5 to 1%

0.1 to 0.5%

34. The basic constituents of Hastelloy are

Nickel, Copper, etc.

All of the above

Aluminium, copper etc.

Nickel, molybdenum etc.

35. Railway rails are normally made of

Tungsten steel

Alloy steel

Mild steel

High carbon

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

All of these

Magnet steel

Alloy and carbon tool steel

High speed tool steel

37. Hardness of steel depends on

Method of fabrication

Contents of alloying elements

Amount of carbon it contains

The shape and distribution of the carbides in iron

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

Brittleness

Ductility

Malleability

Plasticity

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

Brass

Bronze

Muntz metal

Gun metal

40. Blast furnace is used to produce

Cast iron

Wrought iron

Pig iron

Steel

Engineering Materials Practice Set-7

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