Engineering Materials Practice Set-7

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1. Quenching is not necessary when hardening is done by

Any one of these

Case hardening

Flame hardening

Nitriding

2. Induction hardening is the process of

Inducing hardness by continuous process

Increasing hardness throughout

Heating and cooling rapidly

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

3. Railway rails are normally made of

High carbon

Mild steel

Tungsten steel

Alloy steel

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

Cobalt

Chromium

Nickel

Vanadium

5. Shock resistance of steel is increased by adding

Nickel and chromium

Chromium

Nickel

Sulphur, lead and phosphorus

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

Vanadium

Cobalt

Carbon

Manganese

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

(D) None of these

(C) Both ‘A’ and ‘B’

(B) Free graphite

(A) Cementite

8. Cyaniding is the process of

Dipping steel in cyanide bath

Reacting steel surface with cyanide salts

Obtaining cyanide salts

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

9. Eutectoid steel contains following percentage of carbon

0.3%

0.02%

0.63%

0.8%

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

Invar

Hastelloy

Duralumin

Silver metal

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11. Inconel is an alloy of

Nickel, Chromium

Nickel, copper

Nickel, chromium and iron

Nickel, zinc

12. Free carbon in iron makes the metal

Hard and gives a coarse grained crystalline structure

Soft and gives a fine grained crystalline structure

Hard and gives a fine grained crystalline structure

Soft and gives a coarse grained crystalline structure

13. The hardness of steel depends upon the

Method of manufacture of steel

Amount of carbon it contains

Amount of cementite it contains

Contents of alloying elements

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

Nickel

Tungsten

Vanadium

Chromium

15. Hardness of martensite is about

RC 57

RC 65

RC 48

RC 80

16. An engineer's hammer is made of

Cast iron

Forged steel

Mild steel

High carbon steel

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

Alloy and carbon tool steel

High speed tool steel

All of these

Magnet steel

18. 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

19. Ball bearings are, usually, made from

Medium carbon steel

Chrome steel

Low carbon steel

High carbon steel

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

Does not effect

None of these

Lowers

Raises

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21. Maximum percentage of carbon in ferrite is

0.06%

0.1%

0.25%

0.025%

22. German silver contains

2% silver

No silver

5% silver

1% silver

23. Solder is an alloy consisting of

Tin and copper

Tin, antimony, copper

Tin and lead

Lead and zinc

24. The blade of a power saw is made of

High speed steel

Boron steel

Stainless steel

Malleable cast iron

25. Process of Austempering results in

Carburised structure

Martenistic structure

Formation of bainite structure

Lamellar layers of carbide distributed throughout the structure

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

Nickel steel

High speed steel

Stainless steel

Heat resisting steel

27. Machining properties of steel are improved by adding

Chromium, nickel

Vanadium, aluminium

Silicon, aluminium, titanium

Sulphur, lead, phosphorous

28. 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

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

Ductility

Brittleness

Malleability

Plasticity

30. The carbon in the pig iron varies from

0.5 to 1%

5 to 10%

0.1 to 0.5%

1 to 5%

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31. Corrosion resistance of steel is increased by addition of

Vanadium, aluminium

Tungsten, molybdenum, vanadium, chromium

Sulphur, phosphorus, lead

Chromium and nickel

32. A cold chisel is made of

Cast iron

Mild steel

High carbon

H.S.S

33. The basic constituents of Hastelloy are

Nickel, Copper, etc.

All of the above

Nickel, molybdenum etc.

Aluminium, copper etc.

34. Basic constituents of Monel metal are

Zinc, tin, lead

Nickel, copper

Nickel, lead and tin

Nickel, molybdenum

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

Ductile

Malleable

Anisotropic

Homogeneous

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

Brass

Bronze

Muntz metal

Gun metal

37. Iron ore is usually found in the form of

All of these

Oxides

Carbonates

Sulphides

38. German silver is an alloy of

Nickel, Copper and zinc

Refined silver

Nickel and copper

Silver and some impurities

39. Hardness of steel depends on

Contents of alloying elements

Method of fabrication

Amount of carbon it contains

The shape and distribution of the carbides in iron

40. Blast furnace is used to produce

Pig iron

Cast iron

Wrought iron

Steel

Engineering Materials Practice Set-7

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