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.

(D) None of these

(C) Both ‘A’ and ‘B’

(A) Cementite

(B) Free graphite

2. Corrosion resistance of steel is increased by addition of

Sulphur, phosphorus, lead

Chromium and nickel

Tungsten, molybdenum, vanadium, chromium

Vanadium, aluminium

3. Basic constituents of Monel metal are

Nickel, copper

Zinc, tin, lead

Nickel, lead and tin

Nickel, molybdenum

4. The basic constituents of Hastelloy are

Nickel, Copper, etc.

Nickel, molybdenum etc.

Aluminium, copper etc.

All of the above

5. Railway rails are normally made of

Mild steel

Tungsten steel

Alloy steel

High carbon

6. Solder is an alloy consisting of

Tin and lead

Tin and copper

Tin, antimony, copper

Lead and zinc

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

Does not effect

Lowers

Raises

None of these

8. Hardness of steel depends on

Contents of alloying elements

The shape and distribution of the carbides in iron

Method of fabrication

Amount of carbon it contains

9. Hardness of martensite is about

RC 48

RC 80

RC 65

RC 57

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

Carbon

Manganese

Cobalt

Vanadium

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11. Maximum percentage of carbon in ferrite is

0.1%

0.25%

0.025%

0.06%

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

Duralumin

Silver metal

Invar

Hastelloy

13. Induction hardening is the process of

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

Increasing hardness throughout

Heating and cooling rapidly

Inducing hardness by continuous process

14. German silver is an alloy of

Refined silver

Silver and some impurities

Nickel, Copper and zinc

Nickel and copper

15. A cold chisel is made of

High carbon

H.S.S

Mild steel

Cast iron

16. Free carbon in iron makes the metal

Hard and gives a fine grained crystalline structure

Soft and gives a fine grained crystalline structure

Hard and gives a coarse grained crystalline structure

Soft and gives a coarse grained crystalline structure

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

All of these

Magnet steel

Alloy and carbon tool steel

High speed tool steel

18. An engineer's hammer is made of

Mild steel

High carbon steel

Forged steel

Cast iron

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

Cobalt

Vanadium

Chromium

Nickel

20. Inconel is an alloy of

Nickel, zinc

Nickel, copper

Nickel, chromium and iron

Nickel, Chromium

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21. Machining properties of steel are improved by adding

Sulphur, lead, phosphorous

Chromium, nickel

Silicon, aluminium, titanium

Vanadium, aluminium

22. The hardness of steel depends upon the

Method of manufacture of steel

Amount of cementite it contains

Amount of carbon it contains

Contents of alloying elements

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

Malleability

Ductility

Brittleness

Plasticity

24. Blast furnace is used to produce

Wrought iron

Pig iron

Cast iron

Steel

25. German silver contains

1% silver

2% silver

No silver

5% silver

26. The blade of a power saw is made of

Stainless steel

Malleable cast iron

Boron steel

High speed steel

27. Ball bearings are, usually, made from

Chrome steel

High carbon steel

Low carbon steel

Medium carbon steel

28. Cyaniding is the process of

Dipping steel in cyanide bath

Obtaining cyanide salts

Reacting steel surface with cyanide salts

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

29. The carbon in the pig iron varies from

0.5 to 1%

5 to 10%

0.1 to 0.5%

1 to 5%

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

Homogeneous

Ductile

Anisotropic

Malleable

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31. 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

32. Quenching is not necessary when hardening is done by

Nitriding

Flame hardening

Case hardening

Any one of these

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

Chromium

Nickel

Tungsten

Vanadium

34. Process of Austempering results in

Formation of bainite structure

Lamellar layers of carbide distributed throughout the structure

Martenistic structure

Carburised structure

35. Shock resistance of steel is increased by adding

Sulphur, lead and phosphorus

Nickel

Chromium

Nickel and chromium

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

High speed steel

Heat resisting steel

Stainless steel

Nickel steel

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

Muntz metal

Gun metal

Brass

Bronze

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

Hysteresis

Visco elasticity

Boeschinger effect

Creep

39. Eutectoid steel contains following percentage of carbon

0.63%

0.8%

0.3%

0.02%

40. Iron ore is usually found in the form of

Sulphides

All of these

Oxides

Carbonates

Engineering Materials Practice Set-7

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