Engineering Materials Practice Set-7

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1. Induction hardening is the process of

Heating and cooling rapidly

Inducing hardness by continuous process

Increasing hardness throughout

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

2. The hardness of steel depends upon the

Amount of carbon it contains

Method of manufacture of steel

Contents of alloying elements

Amount of cementite it contains

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

Manganese

Cobalt

Vanadium

Carbon

4. The blade of a power saw is made of

Boron steel

Stainless steel

Malleable cast iron

High speed steel

5. Hardness of martensite is about

RC 80

RC 57

RC 65

RC 48

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

Anisotropic

Malleable

Ductile

Homogeneous

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

Vanadium

Nickel

Chromium

Cobalt

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

Magnet steel

All of these

High speed tool steel

Alloy and carbon tool steel

9. The carbon in the pig iron varies from

0.5 to 1%

5 to 10%

1 to 5%

0.1 to 0.5%

10. Shock resistance of steel is increased by adding

Nickel

Nickel and chromium

Chromium

Sulphur, lead and phosphorus

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

Ductility

Brittleness

Plasticity

Malleability

12. Maximum percentage of carbon in ferrite is

0.25%

0.1%

0.06%

0.025%

13. German silver is an alloy of

Nickel, Copper and zinc

Refined silver

Nickel and copper

Silver and some impurities

14. Solder is an alloy consisting of

Tin, antimony, copper

Tin and lead

Lead and zinc

Tin and copper

15. A cold chisel is made of

High carbon

Mild steel

H.S.S

Cast iron

16. An engineer's hammer is made of

Cast iron

Forged steel

Mild steel

High carbon steel

17. Corrosion resistance of steel is increased by addition of

Sulphur, phosphorus, lead

Vanadium, aluminium

Tungsten, molybdenum, vanadium, chromium

Chromium and nickel

18. Cyaniding is the process of

Reacting steel surface with cyanide salts

Obtaining cyanide salts

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

Dipping steel in cyanide bath

19. German silver contains

5% silver

2% silver

No silver

1% silver

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

(C) Both ‘A’ and ‘B’

(A) Cementite

(B) Free graphite

(D) None of these

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

Does not effect

None of these

Lowers

Raises

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

High speed steel

Stainless steel

Heat resisting steel

Nickel steel

23. Quenching is not necessary when hardening is done by

Any one of these

Nitriding

Case hardening

Flame hardening

24. Railway rails are normally made of

High carbon

Tungsten steel

Mild steel

Alloy steel

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

Duralumin

Hastelloy

Silver metal

Invar

26. Machining properties of steel are improved by adding

Chromium, nickel

Silicon, aluminium, titanium

Sulphur, lead, phosphorous

Vanadium, aluminium

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

Visco elasticity

Hysteresis

Boeschinger effect

Creep

28. Basic constituents of Monel metal are

Nickel, copper

Zinc, tin, lead

Nickel, molybdenum

Nickel, lead and tin

29. Process of Austempering results in

Martenistic structure

Carburised structure

Lamellar layers of carbide distributed throughout the structure

Formation of bainite structure

30. Free carbon in iron makes the metal

Soft and gives a fine grained crystalline structure

Hard and gives a coarse grained crystalline structure

Hard and gives a fine grained crystalline structure

Soft and gives a coarse grained crystalline structure

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

Bronze

Gun metal

Brass

Muntz metal

32. Inconel is an alloy of

Nickel, Chromium

Nickel, zinc

Nickel, copper

Nickel, chromium and iron

33. Eutectoid steel contains following percentage of carbon

0.8%

0.3%

0.02%

0.63%

34. The basic constituents of Hastelloy are

All of the above

Aluminium, copper etc.

Nickel, molybdenum etc.

Nickel, Copper, etc.

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

Externally applied forces with breakdown or yielding

Fracture due to high impact loads

Deformation under stress

None of these

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

Chromium

Vanadium

Nickel

Tungsten

37. Iron ore is usually found in the form of

Oxides

Sulphides

Carbonates

All of these

38. Blast furnace is used to produce

Wrought iron

Pig iron

Steel

Cast iron

39. Hardness of steel depends on

The shape and distribution of the carbides in iron

Method of fabrication

Contents of alloying elements

Amount of carbon it contains

40. Ball bearings are, usually, made from

Low carbon steel

High carbon steel

Medium carbon steel

Chrome steel

Engineering Materials Practice Set-7

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