Engineering Materials Practice Set-7

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

Duralumin

Invar

Silver metal

Hastelloy

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

Plasticity

Malleability

Brittleness

Ductility

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

Cobalt

Carbon

Manganese

Vanadium

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

None of these

Does not effect

Lowers

Raises

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

Magnet steel

All of these

High speed tool steel

Alloy and carbon tool steel

6. Induction hardening is the process of

Heating and cooling rapidly

Increasing hardness throughout

Inducing hardness by continuous process

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

7. Machining properties of steel are improved by adding

Sulphur, lead, phosphorous

Vanadium, aluminium

Silicon, aluminium, titanium

Chromium, nickel

8. 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’

(B) Free graphite

(D) None of these

9. Free carbon in iron makes the metal

Soft and gives a fine grained crystalline structure

Hard and gives a fine grained crystalline structure

Hard and gives a coarse grained crystalline structure

Soft and gives a coarse grained crystalline structure

10. German silver contains

No silver

1% silver

2% silver

5% silver

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11. Hardness of steel depends on

Amount of carbon it contains

The shape and distribution of the carbides in iron

Contents of alloying elements

Method of fabrication

12. Ball bearings are, usually, made from

High carbon steel

Low carbon steel

Chrome steel

Medium carbon steel

13. Basic constituents of Monel metal are

Nickel, copper

Zinc, tin, lead

Nickel, molybdenum

Nickel, lead and tin

14. The blade of a power saw is made of

Stainless steel

High speed steel

Boron steel

Malleable cast iron

15. Iron ore is usually found in the form of

Oxides

Sulphides

All of these

Carbonates

16. Inconel is an alloy of

Nickel, chromium and iron

Nickel, copper

Nickel, Chromium

Nickel, zinc

17. Maximum percentage of carbon in ferrite is

0.1%

0.06%

0.025%

0.25%

18. Blast furnace is used to produce

Pig iron

Wrought iron

Cast iron

Steel

19. A cold chisel is made of

Mild steel

H.S.S

High carbon

Cast iron

20. Railway rails are normally made of

Tungsten steel

High carbon

Alloy steel

Mild steel

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

Boeschinger effect

Visco elasticity

Hysteresis

Creep

22. The carbon in the pig iron varies from

0.5 to 1%

0.1 to 0.5%

1 to 5%

5 to 10%

23. The hardness of steel depends upon the

Method of manufacture of steel

Contents of alloying elements

Amount of carbon it contains

Amount of cementite it contains

24. Solder is an alloy consisting of

Tin and lead

Tin and copper

Lead and zinc

Tin, antimony, copper

25. German silver is an alloy of

Nickel and copper

Refined silver

Silver and some impurities

Nickel, Copper and zinc

26. Corrosion resistance of steel is increased by addition of

Sulphur, phosphorus, lead

Vanadium, aluminium

Chromium and nickel

Tungsten, molybdenum, vanadium, chromium

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

Muntz metal

Brass

Bronze

Gun metal

28. An engineer's hammer is made of

Cast iron

Mild steel

High carbon steel

Forged steel

29. Quenching is not necessary when hardening is done by

Nitriding

Case hardening

Any one of these

Flame hardening

30. 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

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

Homogeneous

Malleable

Ductile

Anisotropic

32. Shock resistance of steel is increased by adding

Nickel

Nickel and chromium

Sulphur, lead and phosphorus

Chromium

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

Nickel steel

Heat resisting steel

High speed steel

Stainless steel

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

Tungsten

Nickel

Chromium

Vanadium

35. Process of Austempering results in

Formation of bainite structure

Carburised structure

Lamellar layers of carbide distributed throughout the structure

Martenistic structure

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

Cobalt

Chromium

Vanadium

Nickel

37. The basic constituents of Hastelloy are

All of the above

Nickel, molybdenum etc.

Nickel, Copper, etc.

Aluminium, copper etc.

38. Eutectoid steel contains following percentage of carbon

0.02%

0.8%

0.3%

0.63%

39. Cyaniding is the process of

Reacting steel surface with cyanide salts

Dipping steel in cyanide bath

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

Obtaining cyanide salts

40. Hardness of martensite is about

RC 48

RC 65

RC 57

RC 80

Engineering Materials Practice Set-7

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