Engineering Materials Practice Set-7

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1. German silver contains

No silver

5% silver

1% silver

2% silver

2. An engineer's hammer is made of

High carbon steel

Cast iron

Forged steel

Mild steel

3. Cyaniding is the process of

Dipping steel in cyanide bath

Reacting steel surface with cyanide salts

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

Obtaining cyanide salts

4. The blade of a power saw is made of

Malleable cast iron

Stainless steel

Boron steel

High speed steel

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

Chromium

Vanadium

Nickel

Tungsten

6. Induction hardening is the process of

Heating and cooling rapidly

Increasing hardness throughout

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

Inducing hardness by continuous process

7. A cold chisel is made of

H.S.S

Cast iron

Mild steel

High carbon

8. Solder is an alloy consisting of

Tin and lead

Tin and copper

Tin, antimony, copper

Lead and zinc

9. Inconel is an alloy of

Nickel, zinc

Nickel, copper

Nickel, chromium and iron

Nickel, Chromium

10. The basic constituents of Hastelloy are

Nickel, Copper, etc.

Aluminium, copper etc.

All of the above

Nickel, molybdenum etc.

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11. Hardness of steel depends on

Amount of carbon it contains

Method of fabrication

Contents of alloying elements

The shape and distribution of the carbides in iron

12. German silver is an alloy of

Nickel, Copper and zinc

Refined silver

Nickel and copper

Silver and some impurities

13. Shock resistance of steel is increased by adding

Sulphur, lead and phosphorus

Nickel

Chromium

Nickel and chromium

14. Ball bearings are, usually, made from

Low carbon steel

High carbon steel

Medium carbon steel

Chrome steel

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

Plasticity

Malleability

Ductility

Brittleness

16. Railway rails are normally made of

Mild steel

Tungsten steel

High carbon

Alloy steel

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

All of these

Magnet steel

High speed tool steel

Alloy and carbon tool steel

18. Iron ore is usually found in the form of

Sulphides

Oxides

Carbonates

All of these

19. Maximum percentage of carbon in ferrite is

0.025%

0.25%

0.1%

0.06%

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

Vanadium

Chromium

Nickel

Cobalt

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21. Eutectoid steel contains following percentage of carbon

0.02%

0.8%

0.3%

0.63%

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

Vanadium

Manganese

Carbon

Cobalt

23. Quenching is not necessary when hardening is done by

Flame hardening

Nitriding

Any one of these

Case hardening

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

(D) None of these

(A) Cementite

(B) Free graphite

(C) Both ‘A’ and ‘B’

25. Basic constituents of Monel metal are

Nickel, lead and tin

Nickel, molybdenum

Zinc, tin, lead

Nickel, copper

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

Duralumin

Silver metal

Hastelloy

Invar

27. Corrosion resistance of steel is increased by addition of

Chromium and nickel

Vanadium, aluminium

Tungsten, molybdenum, vanadium, chromium

Sulphur, phosphorus, lead

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

Brass

Bronze

Gun metal

Muntz metal

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

Stainless steel

Nickel steel

Heat resisting steel

High speed steel

30. Process of Austempering results in

Carburised structure

Formation of bainite structure

Martenistic structure

Lamellar layers of carbide distributed throughout the structure

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

None of these

Deformation under stress

Externally applied forces with breakdown or yielding

Fracture due to high impact loads

32. Blast furnace is used to produce

Cast iron

Wrought iron

Pig iron

Steel

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

None of these

Lowers

Raises

Does not effect

34. Machining properties of steel are improved by adding

Vanadium, aluminium

Chromium, nickel

Silicon, aluminium, titanium

Sulphur, lead, phosphorous

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

Hysteresis

Boeschinger effect

Visco elasticity

Creep

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

Homogeneous

Ductile

Malleable

Anisotropic

37. Hardness of martensite is about

RC 80

RC 48

RC 57

RC 65

38. The carbon in the pig iron varies from

0.5 to 1%

1 to 5%

5 to 10%

0.1 to 0.5%

39. The hardness of steel depends upon the

Contents of alloying elements

Method of manufacture of steel

Amount of carbon it contains

Amount of cementite it contains

40. 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

Engineering Materials Practice Set-7

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