Engineering Materials Practice Set-7

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1. 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

2. Ball bearings are, usually, made from

Chrome steel

Low carbon steel

High carbon steel

Medium carbon steel

3. Railway rails are normally made of

Mild steel

High carbon

Alloy steel

Tungsten steel

4. Shock resistance of steel is increased by adding

Nickel and chromium

Chromium

Nickel

Sulphur, lead and phosphorus

5. Blast furnace is used to produce

Wrought iron

Pig iron

Steel

Cast iron

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

Deformation under stress

Fracture due to high impact loads

Externally applied forces with breakdown or yielding

None of these

7. Inconel is an alloy of

Nickel, chromium and iron

Nickel, zinc

Nickel, copper

Nickel, Chromium

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

Anisotropic

Malleable

Ductile

Homogeneous

9. The blade of a power saw is made of

Malleable cast iron

Boron steel

High speed steel

Stainless steel

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

Plasticity

Ductility

Malleability

Brittleness

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11. The carbon in the pig iron varies from

0.5 to 1%

0.1 to 0.5%

1 to 5%

5 to 10%

12. German silver contains

2% silver

5% silver

No silver

1% silver

13. Iron ore is usually found in the form of

Sulphides

Oxides

Carbonates

All of these

14. Process of Austempering results in

Carburised structure

Formation of bainite structure

Martenistic structure

Lamellar layers of carbide distributed throughout the structure

15. Free carbon in iron makes the metal

Hard and gives a fine grained crystalline structure

Soft and gives a fine grained crystalline structure

Soft and gives a coarse grained crystalline structure

Hard and gives a coarse grained crystalline structure

16. Solder is an alloy consisting of

Lead and zinc

Tin and copper

Tin, antimony, copper

Tin and lead

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

Vanadium

Carbon

Manganese

Cobalt

18. Maximum percentage of carbon in ferrite is

0.025%

0.25%

0.1%

0.06%

19. Hardness of steel depends on

Amount of carbon it contains

The shape and distribution of the carbides in iron

Method of fabrication

Contents of alloying elements

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

Muntz metal

Gun metal

Brass

Bronze

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

High speed tool steel

Alloy and carbon tool steel

Magnet steel

All of these

22. Corrosion resistance of steel is increased by addition of

Vanadium, aluminium

Tungsten, molybdenum, vanadium, chromium

Sulphur, phosphorus, lead

Chromium and nickel

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

Vanadium

Nickel

Chromium

Cobalt

24. A cold chisel is made of

Cast iron

Mild steel

High carbon

H.S.S

25. The basic constituents of Hastelloy are

Aluminium, copper etc.

Nickel, Copper, etc.

All of the above

Nickel, molybdenum etc.

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

High speed steel

Stainless steel

Heat resisting steel

Nickel steel

27. Induction hardening is the process of

Increasing hardness throughout

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

Heating and cooling rapidly

Inducing hardness by continuous process

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

Boeschinger effect

Hysteresis

Visco elasticity

Creep

29. Cyaniding is the process of

Obtaining cyanide salts

Reacting steel surface with cyanide salts

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

Dipping steel in cyanide bath

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

Invar

Silver metal

Hastelloy

Duralumin

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31. German silver is an alloy of

Nickel, Copper and zinc

Nickel and copper

Refined silver

Silver and some impurities

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

Tungsten

Chromium

Vanadium

Nickel

33. The hardness of steel depends upon the

Contents of alloying elements

Amount of carbon it contains

Method of manufacture of steel

Amount of cementite it contains

34. Hardness of martensite is about

RC 65

RC 48

RC 80

RC 57

35. Basic constituents of Monel metal are

Nickel, copper

Nickel, molybdenum

Nickel, lead and tin

Zinc, tin, lead

36. Machining properties of steel are improved by adding

Chromium, nickel

Sulphur, lead, phosphorous

Vanadium, aluminium

Silicon, aluminium, titanium

37. An engineer's hammer is made of

High carbon steel

Forged steel

Cast iron

Mild steel

38. Eutectoid steel contains following percentage of carbon

0.3%

0.8%

0.63%

0.02%

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

None of these

Raises

Does not effect

Lowers

40. Quenching is not necessary when hardening is done by

Flame hardening

Any one of these

Nitriding

Case hardening

Engineering Materials Practice Set-7

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