Engineering Materials Practice Set-7

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

Raises

Does not effect

Lowers

None of these

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

Magnet steel

High speed tool steel

Alloy and carbon tool steel

All of these

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

Vanadium

Nickel

Cobalt

Chromium

4. Machining properties of steel are improved by adding

Chromium, nickel

Silicon, aluminium, titanium

Vanadium, aluminium

Sulphur, lead, phosphorous

5. Eutectoid steel contains following percentage of carbon

0.02%

0.63%

0.8%

0.3%

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

Ductile

Malleable

Anisotropic

Homogeneous

7. Free carbon in iron makes the metal

Hard and gives a fine grained crystalline structure

Soft and gives a fine grained crystalline structure

Soft and gives a coarse grained crystalline structure

Hard and gives a coarse grained crystalline structure

8. Solder is an alloy consisting of

Lead and zinc

Tin, antimony, copper

Tin and copper

Tin and lead

9. Ball bearings are, usually, made from

Medium carbon steel

Chrome steel

High carbon steel

Low carbon steel

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

Vanadium

Carbon

Cobalt

Manganese

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11. German silver contains

2% silver

1% silver

No silver

5% silver

12. Inconel is an alloy of

Nickel, chromium and iron

Nickel, copper

Nickel, Chromium

Nickel, zinc

13. Process of Austempering results in

Martenistic structure

Lamellar layers of carbide distributed throughout the structure

Formation of bainite structure

Carburised structure

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

Brittleness

Ductility

Malleability

Plasticity

15. Maximum percentage of carbon in ferrite is

0.1%

0.06%

0.25%

0.025%

16. Railway rails are normally made of

High carbon

Mild steel

Alloy steel

Tungsten steel

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

Duralumin

Hastelloy

Silver metal

Invar

18. Corrosion resistance of steel is increased by addition of

Tungsten, molybdenum, vanadium, chromium

Vanadium, aluminium

Chromium and nickel

Sulphur, phosphorus, lead

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

(B) Free graphite

(D) None of these

(C) Both ‘A’ and ‘B’

(A) Cementite

20. A cold chisel is made of

Cast iron

H.S.S

High carbon

Mild steel

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21. Shock resistance of steel is increased by adding

Nickel and chromium

Sulphur, lead and phosphorus

Chromium

Nickel

22. Iron ore is usually found in the form of

Oxides

Sulphides

Carbonates

All of these

23. An engineer's hammer is made of

Forged steel

Cast iron

High carbon steel

Mild steel

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

Gun metal

Muntz metal

Bronze

Brass

25. Hardness of steel depends on

Contents of alloying elements

Amount of carbon it contains

The shape and distribution of the carbides in iron

Method of fabrication

26. Quenching is not necessary when hardening is done by

Flame hardening

Any one of these

Case hardening

Nitriding

27. The blade of a power saw is made of

High speed steel

Boron steel

Stainless steel

Malleable cast iron

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

Externally applied forces with breakdown or yielding

None of these

Deformation under stress

Fracture due to high impact loads

29. Hardness of martensite is about

RC 48

RC 57

RC 80

RC 65

30. The carbon in the pig iron varies from

5 to 10%

0.1 to 0.5%

1 to 5%

0.5 to 1%

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31. Basic constituents of Monel metal are

Nickel, copper

Nickel, molybdenum

Nickel, lead and tin

Zinc, tin, lead

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

Heat resisting steel

Nickel steel

High speed steel

Stainless steel

33. Blast furnace is used to produce

Wrought iron

Pig iron

Steel

Cast iron

34. Cyaniding is the process of

Obtaining cyanide salts

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

Reacting steel surface with cyanide salts

Dipping steel in cyanide bath

35. Induction hardening is the process of

Increasing hardness throughout

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

Heating and cooling rapidly

Inducing hardness by continuous process

36. German silver is an alloy of

Nickel, Copper and zinc

Refined silver

Silver and some impurities

Nickel and copper

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

Nickel

Vanadium

Tungsten

Chromium

38. The basic constituents of Hastelloy are

Aluminium, copper etc.

Nickel, molybdenum etc.

Nickel, Copper, etc.

All of the above

39. The hardness of steel depends upon the

Amount of cementite it contains

Amount of carbon it contains

Method of manufacture of steel

Contents of alloying elements

40. 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

Engineering Materials Practice Set-7

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