Engineering Materials Practice Set-7

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

Carbon

Vanadium

Manganese

Cobalt

2. Shock resistance of steel is increased by adding

Chromium

Nickel and chromium

Nickel

Sulphur, lead and phosphorus

3. German silver is an alloy of

Nickel and copper

Refined silver

Silver and some impurities

Nickel, Copper and zinc

4. Cyaniding is the process of

Obtaining cyanide salts

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

Dipping steel in cyanide bath

Reacting steel surface with cyanide salts

5. Machining properties of steel are improved by adding

Vanadium, aluminium

Sulphur, lead, phosphorous

Chromium, nickel

Silicon, aluminium, titanium

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

None of these

Externally applied forces with breakdown or yielding

Deformation under stress

Fracture due to high impact loads

7. Hardness of steel depends on

Contents of alloying elements

Amount of carbon it contains

The shape and distribution of the carbides in iron

Method of fabrication

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

All of these

High speed tool steel

Alloy and carbon tool steel

Magnet steel

9. German silver contains

2% silver

No silver

5% silver

1% silver

10. Basic constituents of Monel metal are

Nickel, copper

Zinc, tin, lead

Nickel, molybdenum

Nickel, lead and tin

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11. Free carbon in iron makes the metal

Soft and gives a coarse grained crystalline structure

Hard and gives a fine grained crystalline structure

Hard and gives a coarse grained crystalline structure

Soft and gives a fine grained crystalline structure

12. Inconel is an alloy of

Nickel, Chromium

Nickel, chromium and iron

Nickel, zinc

Nickel, copper

13. Railway rails are normally made of

High carbon

Mild steel

Tungsten steel

Alloy steel

14. Solder is an alloy consisting of

Tin, antimony, copper

Tin and lead

Tin and copper

Lead and zinc

15. Eutectoid steel contains following percentage of carbon

0.3%

0.02%

0.8%

0.63%

16. A cold chisel is made of

High carbon

Mild steel

H.S.S

Cast iron

17. 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

18. Ball bearings are, usually, made from

High carbon steel

Chrome steel

Low carbon steel

Medium carbon steel

19. Iron ore is usually found in the form of

Sulphides

All of these

Carbonates

Oxides

20. Corrosion resistance of steel is increased by addition of

Tungsten, molybdenum, vanadium, chromium

Chromium and nickel

Vanadium, aluminium

Sulphur, phosphorus, lead

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

Nickel steel

Stainless steel

Heat resisting steel

High speed steel

22. The hardness of steel depends upon the

Contents of alloying elements

Amount of cementite it contains

Method of manufacture of steel

Amount of carbon it contains

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

Muntz metal

Brass

Gun metal

Bronze

24. Quenching is not necessary when hardening is done by

Flame hardening

Case hardening

Any one of these

Nitriding

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

Brittleness

Ductility

Malleability

Plasticity

26. Process of Austempering results in

Carburised structure

Martenistic structure

Formation of bainite structure

Lamellar layers of carbide distributed throughout the structure

27. An engineer's hammer is made of

Cast iron

High carbon steel

Mild steel

Forged steel

28. The carbon in the pig iron varies from

0.5 to 1%

5 to 10%

0.1 to 0.5%

1 to 5%

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

Does not effect

None of these

Lowers

Raises

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

Hastelloy

Silver metal

Invar

Duralumin

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

Cobalt

Chromium

Vanadium

Nickel

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

Hysteresis

Creep

Boeschinger effect

Visco elasticity

33. Blast furnace is used to produce

Cast iron

Wrought iron

Pig iron

Steel

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

Homogeneous

Anisotropic

Malleable

Ductile

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

Tungsten

Chromium

Nickel

Vanadium

36. Hardness of martensite is about

RC 65

RC 48

RC 80

RC 57

37. The blade of a power saw is made of

Malleable cast iron

Stainless steel

High speed steel

Boron steel

38. Maximum percentage of carbon in ferrite is

0.1%

0.25%

0.025%

0.06%

39. 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

40. The basic constituents of Hastelloy are

Aluminium, copper etc.

Nickel, Copper, etc.

Nickel, molybdenum etc.

All of the above

Engineering Materials Practice Set-7

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