Engineering Materials Practice Set-7

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1. A cold chisel is made of

Mild steel

Cast iron

H.S.S

High carbon

2. German silver is an alloy of

Nickel and copper

Nickel, Copper and zinc

Refined silver

Silver and some impurities

3. Shock resistance of steel is increased by adding

Chromium

Sulphur, lead and phosphorus

Nickel and chromium

Nickel

4. 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

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

(A) Cementite

(D) None of these

(C) Both ‘A’ and ‘B’

(B) Free graphite

6. Hardness of martensite is about

RC 48

RC 57

RC 80

RC 65

7. Machining properties of steel are improved by adding

Sulphur, lead, phosphorous

Silicon, aluminium, titanium

Chromium, nickel

Vanadium, aluminium

8. 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

9. Maximum percentage of carbon in ferrite is

0.06%

0.25%

0.025%

0.1%

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

Chromium

Nickel

Tungsten

Vanadium

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

None of these

Raises

Lowers

Does not effect

12. Eutectoid steel contains following percentage of carbon

0.3%

0.02%

0.8%

0.63%

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

Nickel steel

High speed steel

Stainless steel

Heat resisting steel

14. The basic constituents of Hastelloy are

All of the above

Aluminium, copper etc.

Nickel, Copper, etc.

Nickel, molybdenum etc.

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

Brass

Bronze

Gun metal

Muntz metal

16. Quenching is not necessary when hardening is done by

Nitriding

Any one of these

Case hardening

Flame hardening

17. Process of Austempering results in

Carburised structure

Formation of bainite structure

Martenistic structure

Lamellar layers of carbide distributed throughout the structure

18. German silver contains

No silver

1% silver

5% silver

2% silver

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

Magnet steel

All of these

Alloy and carbon tool steel

High speed tool steel

20. Hardness of steel depends on

Contents of alloying elements

Method of fabrication

Amount of carbon it contains

The shape and distribution of the carbides in iron

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21. An engineer's hammer is made of

Forged steel

Cast iron

Mild steel

High carbon steel

22. Ball bearings are, usually, made from

High carbon steel

Low carbon steel

Chrome steel

Medium carbon steel

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

Hastelloy

Silver metal

Duralumin

Invar

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

Visco elasticity

Hysteresis

Boeschinger effect

Creep

25. Corrosion resistance of steel is increased by addition of

Sulphur, phosphorus, lead

Chromium and nickel

Tungsten, molybdenum, vanadium, chromium

Vanadium, aluminium

26. The blade of a power saw is made of

High speed steel

Stainless steel

Malleable cast iron

Boron steel

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

Anisotropic

Ductile

Homogeneous

Malleable

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

Brittleness

Malleability

Ductility

Plasticity

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

Manganese

Cobalt

Carbon

Vanadium

30. Inconel is an alloy of

Nickel, chromium and iron

Nickel, Chromium

Nickel, zinc

Nickel, copper

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

Vanadium

Cobalt

Nickel

Chromium

32. 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

33. Iron ore is usually found in the form of

All of these

Sulphides

Carbonates

Oxides

34. Railway rails are normally made of

Tungsten steel

Alloy steel

High carbon

Mild steel

35. 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

36. Basic constituents of Monel metal are

Nickel, lead and tin

Nickel, molybdenum

Zinc, tin, lead

Nickel, copper

37. Blast furnace is used to produce

Steel

Cast iron

Wrought iron

Pig iron

38. The hardness of steel depends upon the

Amount of carbon it contains

Method of manufacture of steel

Amount of cementite it contains

Contents of alloying elements

39. The carbon in the pig iron varies from

5 to 10%

0.5 to 1%

0.1 to 0.5%

1 to 5%

40. Solder is an alloy consisting of

Tin, antimony, copper

Tin and copper

Tin and lead

Lead and zinc

Engineering Materials Practice Set-7

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