Engineering Materials Practice Set-7

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

Cobalt

Vanadium

Nickel

Chromium

2. German silver is an alloy of

Refined silver

Nickel and copper

Silver and some impurities

Nickel, Copper and zinc

3. Process of Austempering results in

Formation of bainite structure

Lamellar layers of carbide distributed throughout the structure

Carburised structure

Martenistic structure

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

Manganese

Vanadium

Cobalt

Carbon

5. Railway rails are normally made of

Mild steel

High carbon

Alloy steel

Tungsten steel

6. Induction hardening is the process of

Increasing hardness throughout

Heating and cooling rapidly

Inducing hardness by continuous process

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

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

(A) Cementite

(C) Both ‘A’ and ‘B’

(D) None of these

(B) Free graphite

8. The hardness of steel depends upon the

Amount of carbon it contains

Contents of alloying elements

Method of manufacture of steel

Amount of cementite it contains

9. The carbon in the pig iron varies from

0.5 to 1%

1 to 5%

0.1 to 0.5%

5 to 10%

10. Eutectoid steel contains following percentage of carbon

0.63%

0.8%

0.02%

0.3%

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11. Ball bearings are, usually, made from

High carbon steel

Low carbon steel

Medium carbon steel

Chrome steel

12. Corrosion resistance of steel is increased by addition of

Sulphur, phosphorus, lead

Tungsten, molybdenum, vanadium, chromium

Vanadium, aluminium

Chromium and nickel

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

None of these

Deformation under stress

Externally applied forces with breakdown or yielding

Fracture due to high impact loads

14. Quenching is not necessary when hardening is done by

Nitriding

Any one of these

Flame hardening

Case hardening

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

Stainless steel

Heat resisting steel

Nickel steel

High speed steel

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

Brittleness

Malleability

Plasticity

Ductility

17. Machining properties of steel are improved by adding

Silicon, aluminium, titanium

Chromium, nickel

Vanadium, aluminium

Sulphur, lead, phosphorous

18. German silver contains

No silver

1% silver

5% silver

2% silver

19. Hardness of steel depends on

The shape and distribution of the carbides in iron

Contents of alloying elements

Method of fabrication

Amount of carbon it contains

20. Blast furnace is used to produce

Steel

Wrought iron

Cast iron

Pig iron

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21. Shock resistance of steel is increased by adding

Nickel and chromium

Sulphur, lead and phosphorus

Nickel

Chromium

22. Solder is an alloy consisting of

Tin and lead

Tin, antimony, copper

Tin and copper

Lead and zinc

23. The basic constituents of Hastelloy are

Aluminium, copper etc.

All of the above

Nickel, Copper, etc.

Nickel, molybdenum etc.

24. Cyaniding is the process of

Obtaining cyanide salts

Dipping steel in cyanide bath

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

Reacting steel surface with cyanide salts

25. Free carbon in iron makes the metal

Hard and gives a coarse grained crystalline structure

Soft and gives a fine grained crystalline structure

Soft and gives a coarse grained crystalline structure

Hard and gives a fine grained crystalline structure

26. An engineer's hammer is made of

Cast iron

High carbon steel

Forged steel

Mild steel

27. Hardness of martensite is about

RC 80

RC 48

RC 57

RC 65

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

None of these

Lowers

Does not effect

Raises

29. Inconel is an alloy of

Nickel, zinc

Nickel, chromium and iron

Nickel, copper

Nickel, Chromium

30. A cold chisel is made of

Mild steel

Cast iron

High carbon

H.S.S

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31. Maximum percentage of carbon in ferrite is

0.25%

0.1%

0.06%

0.025%

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

Homogeneous

Malleable

Anisotropic

Ductile

33. The blade of a power saw is made of

Boron steel

Malleable cast iron

Stainless steel

High speed steel

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

Hastelloy

Duralumin

Silver metal

Invar

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

Magnet steel

High speed tool steel

Alloy and carbon tool steel

All of these

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

Tungsten

Nickel

Chromium

Vanadium

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

Creep

Boeschinger effect

Hysteresis

Visco elasticity

38. Iron ore is usually found in the form of

Sulphides

Carbonates

All of these

Oxides

39. Basic constituents of Monel metal are

Nickel, molybdenum

Nickel, copper

Zinc, tin, lead

Nickel, lead and tin

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

Bronze

Gun metal

Brass

Muntz metal

Engineering Materials Practice Set-7

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