Engineering Materials Practice Set-7

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1. An engineer's hammer is made of

Cast iron

High carbon steel

Mild steel

Forged steel

2. Eutectoid steel contains following percentage of carbon

0.8%

0.3%

0.02%

0.63%

3. A cold chisel is made of

High carbon

Cast iron

H.S.S

Mild steel

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

Stainless steel

Heat resisting steel

Nickel steel

High speed steel

5. The carbon in the pig iron varies from

0.5 to 1%

0.1 to 0.5%

5 to 10%

1 to 5%

6. Iron ore is usually found in the form of

All of these

Carbonates

Sulphides

Oxides

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

Lowers

Raises

None of these

Does not effect

8. Railway rails are normally made of

Mild steel

High carbon

Tungsten steel

Alloy steel

9. Quenching is not necessary when hardening is done by

Nitriding

Flame hardening

Any one of these

Case hardening

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

Chromium

Vanadium

Tungsten

Nickel

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

Gun metal

Bronze

Brass

Muntz metal

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

(C) Both ‘A’ and ‘B’

(B) Free graphite

(A) Cementite

(D) None of these

13. 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

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

Invar

Duralumin

Hastelloy

Silver metal

15. Solder is an alloy consisting of

Tin and copper

Lead and zinc

Tin, antimony, copper

Tin and lead

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

Nickel

Vanadium

Chromium

Cobalt

17. Corrosion resistance of steel is increased by addition of

Tungsten, molybdenum, vanadium, chromium

Sulphur, phosphorus, lead

Chromium and nickel

Vanadium, aluminium

18. 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

19. The blade of a power saw is made of

Malleable cast iron

Stainless steel

High speed steel

Boron steel

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

All of these

High speed tool steel

Alloy and carbon tool steel

Magnet steel

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21. Machining properties of steel are improved by adding

Vanadium, aluminium

Silicon, aluminium, titanium

Sulphur, lead, phosphorous

Chromium, nickel

22. Hardness of martensite is about

RC 65

RC 48

RC 80

RC 57

23. 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

24. Inconel is an alloy of

Nickel, copper

Nickel, zinc

Nickel, Chromium

Nickel, chromium and iron

25. German silver is an alloy of

Nickel, Copper and zinc

Silver and some impurities

Nickel and copper

Refined silver

26. The basic constituents of Hastelloy are

Nickel, Copper, etc.

Nickel, molybdenum etc.

Aluminium, copper etc.

All of the above

27. Hardness of steel depends on

The shape and distribution of the carbides in iron

Amount of carbon it contains

Method of fabrication

Contents of alloying elements

28. Process of Austempering results in

Carburised structure

Martenistic structure

Formation of bainite structure

Lamellar layers of carbide distributed throughout the structure

29. Basic constituents of Monel metal are

Nickel, lead and tin

Zinc, tin, lead

Nickel, molybdenum

Nickel, copper

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

Ductility

Brittleness

Plasticity

Malleability

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

Anisotropic

Homogeneous

Malleable

Ductile

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

Fracture due to high impact loads

Deformation under stress

Externally applied forces with breakdown or yielding

None of these

33. German silver contains

No silver

1% silver

2% silver

5% silver

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

Manganese

Carbon

Vanadium

Cobalt

35. Maximum percentage of carbon in ferrite is

0.025%

0.1%

0.06%

0.25%

36. Induction hardening is the process of

Increasing hardness throughout

Heating and cooling rapidly

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

Inducing hardness by continuous process

37. Blast furnace is used to produce

Pig iron

Cast iron

Steel

Wrought iron

38. Shock resistance of steel is increased by adding

Nickel and chromium

Sulphur, lead and phosphorus

Nickel

Chromium

39. Ball bearings are, usually, made from

Low carbon steel

Chrome steel

High carbon steel

Medium carbon steel

40. Free carbon in iron makes the metal

Soft and gives a coarse grained crystalline structure

Soft and gives a fine grained crystalline structure

Hard and gives a coarse grained crystalline structure

Hard and gives a fine grained crystalline structure

Engineering Materials Practice Set-7

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