Engineering Materials Practice Set-7

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1. Quenching is not necessary when hardening is done by

Any one of these

Case hardening

Nitriding

Flame hardening

2. Machining properties of steel are improved by adding

Sulphur, lead, phosphorous

Vanadium, aluminium

Chromium, nickel

Silicon, aluminium, titanium

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

High speed tool steel

Alloy and carbon tool steel

All of these

Magnet steel

4. Maximum percentage of carbon in ferrite is

0.1%

0.06%

0.025%

0.25%

5. An engineer's hammer is made of

High carbon steel

Mild steel

Forged steel

Cast iron

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

Chromium

Vanadium

Nickel

Tungsten

7. The carbon in the pig iron varies from

0.5 to 1%

5 to 10%

1 to 5%

0.1 to 0.5%

8. 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

9. Inconel is an alloy of

Nickel, chromium and iron

Nickel, zinc

Nickel, Chromium

Nickel, copper

10. German silver contains

5% silver

2% silver

No silver

1% silver

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11. The basic constituents of Hastelloy are

Nickel, molybdenum etc.

Nickel, Copper, etc.

Aluminium, copper etc.

All of the above

12. Solder is an alloy consisting of

Tin and copper

Tin and lead

Lead and zinc

Tin, antimony, copper

13. The blade of a power saw is made of

Malleable cast iron

Boron steel

Stainless steel

High speed steel

14. Iron ore is usually found in the form of

All of these

Oxides

Carbonates

Sulphides

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

Bronze

Gun metal

Muntz metal

Brass

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

Malleable

Ductile

Homogeneous

Anisotropic

17. German silver is an alloy of

Nickel and copper

Nickel, Copper and zinc

Refined silver

Silver and some impurities

18. Basic constituents of Monel metal are

Nickel, lead and tin

Nickel, molybdenum

Zinc, tin, lead

Nickel, copper

19. Corrosion resistance of steel is increased by addition of

Chromium and nickel

Sulphur, phosphorus, lead

Vanadium, aluminium

Tungsten, molybdenum, vanadium, chromium

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

Does not effect

Raises

Lowers

None of these

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21. Ball bearings are, usually, made from

Low carbon steel

High carbon steel

Medium carbon steel

Chrome steel

22. Process of Austempering results in

Martenistic structure

Formation of bainite structure

Lamellar layers of carbide distributed throughout the structure

Carburised structure

23. A cold chisel is made of

H.S.S

Cast iron

High carbon

Mild steel

24. Hardness of steel depends on

The shape and distribution of the carbides in iron

Amount of carbon it contains

Contents of alloying elements

Method of fabrication

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

Stainless steel

Heat resisting steel

High speed steel

Nickel steel

26. Shock resistance of steel is increased by adding

Sulphur, lead and phosphorus

Nickel and chromium

Chromium

Nickel

27. The hardness of steel depends upon the

Method of manufacture of steel

Amount of carbon it contains

Contents of alloying elements

Amount of cementite it contains

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

Creep

Boeschinger effect

Hysteresis

Visco elasticity

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

Plasticity

Brittleness

Ductility

Malleability

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

Vanadium

Chromium

Nickel

Cobalt

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

Vanadium

Manganese

Cobalt

Carbon

32. Cyaniding is the process of

Obtaining cyanide salts

Reacting steel surface with cyanide salts

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

Dipping steel in cyanide bath

33. Blast furnace is used to produce

Wrought iron

Pig iron

Cast iron

Steel

34. Hardness of martensite is about

RC 80

RC 57

RC 65

RC 48

35. 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

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

(B) Free graphite

(C) Both ‘A’ and ‘B’

(D) None of these

(A) Cementite

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

Hastelloy

Duralumin

Invar

Silver metal

38. 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

39. Railway rails are normally made of

Alloy steel

Tungsten steel

Mild steel

High carbon

40. Eutectoid steel contains following percentage of carbon

0.63%

0.02%

0.3%

0.8%

Engineering Materials Practice Set-7

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