Engineering Materials Practice Set-7

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

Lowers

Does not effect

Raises

None of these

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

Anisotropic

Homogeneous

Ductile

Malleable

3. Blast furnace is used to produce

Steel

Cast iron

Wrought iron

Pig iron

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

Manganese

Vanadium

Carbon

Cobalt

5. The carbon in the pig iron varies from

5 to 10%

0.5 to 1%

0.1 to 0.5%

1 to 5%

6. German silver contains

5% silver

1% silver

2% silver

No silver

7. Machining properties of steel are improved by adding

Sulphur, lead, phosphorous

Chromium, nickel

Silicon, aluminium, titanium

Vanadium, aluminium

8. Hardness of steel depends on

Amount of carbon it contains

Contents of alloying elements

Method of fabrication

The shape and distribution of the carbides in iron

9. Iron ore is usually found in the form of

Carbonates

All of these

Oxides

Sulphides

10. 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

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11. An engineer's hammer is made of

Mild steel

Forged steel

Cast iron

High carbon steel

12. The basic constituents of Hastelloy are

All of the above

Nickel, Copper, etc.

Aluminium, copper etc.

Nickel, molybdenum etc.

13. The blade of a power saw is made of

Stainless steel

High speed steel

Boron steel

Malleable cast iron

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

Visco elasticity

Creep

Hysteresis

Boeschinger effect

15. A cold chisel is made of

Cast iron

Mild steel

High carbon

H.S.S

16. The hardness of steel depends upon the

Amount of cementite it contains

Amount of carbon it contains

Contents of alloying elements

Method of manufacture of steel

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

Gun metal

Bronze

Muntz metal

Brass

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

Hastelloy

Invar

Duralumin

Silver metal

19. Cyaniding is the process of

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

Obtaining cyanide salts

20. Hardness of martensite is about

RC 57

RC 48

RC 80

RC 65

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21. 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

22. Solder is an alloy consisting of

Lead and zinc

Tin and copper

Tin and lead

Tin, antimony, copper

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

Vanadium

Nickel

Tungsten

Chromium

24. Corrosion resistance of steel is increased by addition of

Vanadium, aluminium

Tungsten, molybdenum, vanadium, chromium

Sulphur, phosphorus, lead

Chromium and nickel

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

Heat resisting steel

High speed steel

Nickel steel

Stainless steel

26. Ball bearings are, usually, made from

Low carbon steel

High carbon steel

Chrome steel

Medium carbon steel

27. Eutectoid steel contains following percentage of carbon

0.3%

0.8%

0.02%

0.63%

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

None of these

Fracture due to high impact loads

Externally applied forces with breakdown or yielding

Deformation under stress

29. 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

(D) None of these

(A) Cementite

30. Inconel is an alloy of

Nickel, copper

Nickel, Chromium

Nickel, zinc

Nickel, chromium and iron

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31. Shock resistance of steel is increased by adding

Nickel

Sulphur, lead and phosphorus

Chromium

Nickel and chromium

32. Basic constituents of Monel metal are

Nickel, copper

Nickel, molybdenum

Nickel, lead and tin

Zinc, tin, lead

33. Quenching is not necessary when hardening is done by

Case hardening

Flame hardening

Nitriding

Any one of these

34. German silver is an alloy of

Silver and some impurities

Nickel, Copper and zinc

Refined silver

Nickel and copper

35. Railway rails are normally made of

Tungsten steel

Alloy steel

Mild steel

High carbon

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

Alloy and carbon tool steel

High speed tool steel

Magnet steel

All of these

37. Maximum percentage of carbon in ferrite is

0.25%

0.025%

0.06%

0.1%

38. Process of Austempering results in

Formation of bainite structure

Martenistic structure

Carburised structure

Lamellar layers of carbide distributed throughout the structure

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

Cobalt

Vanadium

Nickel

Chromium

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

Plasticity

Ductility

Brittleness

Malleability

Engineering Materials Practice Set-7

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