Engineering Materials Practice Set-7

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

Chromium

Nickel

Cobalt

Vanadium

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

Stainless steel

Nickel steel

High speed steel

Heat resisting steel

3. An engineer's hammer is made of

High carbon steel

Mild steel

Cast iron

Forged steel

4. Free carbon in iron makes the metal

Soft and gives a coarse grained crystalline structure

Hard and gives a fine grained crystalline structure

Soft and gives a fine grained crystalline structure

Hard and gives a coarse grained crystalline structure

5. Machining properties of steel are improved by adding

Sulphur, lead, phosphorous

Vanadium, aluminium

Silicon, aluminium, titanium

Chromium, nickel

6. Quenching is not necessary when hardening is done by

Nitriding

Any one of these

Case hardening

Flame hardening

7. 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

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

Bronze

Muntz metal

Brass

Gun metal

9. Process of Austempering results in

Martenistic structure

Formation of bainite structure

Lamellar layers of carbide distributed throughout the structure

Carburised structure

10. The basic constituents of Hastelloy are

Nickel, Copper, etc.

Aluminium, copper etc.

Nickel, molybdenum etc.

All of the above

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

(D) None of these

(B) Free graphite

(A) Cementite

(C) Both ‘A’ and ‘B’

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

Duralumin

Invar

Hastelloy

Silver metal

13. Railway rails are normally made of

High carbon

Tungsten steel

Mild steel

Alloy steel

14. Iron ore is usually found in the form of

Oxides

All of these

Carbonates

Sulphides

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

Tungsten

Nickel

Vanadium

Chromium

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

Boeschinger effect

Creep

Visco elasticity

Hysteresis

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

Ductile

Anisotropic

Malleable

Homogeneous

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

Malleability

Ductility

Brittleness

Plasticity

19. A cold chisel is made of

High carbon

Cast iron

H.S.S

Mild steel

20. German silver contains

5% silver

2% silver

1% silver

No silver

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21. Eutectoid steel contains following percentage of carbon

0.3%

0.8%

0.02%

0.63%

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

Carbon

Vanadium

Manganese

Cobalt

23. The hardness of steel depends upon the

Method of manufacture of steel

Contents of alloying elements

Amount of carbon it contains

Amount of cementite it contains

24. The carbon in the pig iron varies from

0.1 to 0.5%

0.5 to 1%

1 to 5%

5 to 10%

25. Ball bearings are, usually, made from

Low carbon steel

Chrome steel

High carbon steel

Medium carbon steel

26. Shock resistance of steel is increased by adding

Sulphur, lead and phosphorus

Nickel and chromium

Nickel

Chromium

27. Hardness of martensite is about

RC 57

RC 80

RC 65

RC 48

28. The blade of a power saw is made of

Boron steel

Malleable cast iron

High speed steel

Stainless steel

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

Externally applied forces with breakdown or yielding

None of these

Fracture due to high impact loads

Deformation under stress

30. German silver is an alloy of

Silver and some impurities

Nickel, Copper and zinc

Refined silver

Nickel and copper

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31. Cyaniding is the process of

Dipping steel in cyanide bath

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

Obtaining cyanide salts

Reacting steel surface with cyanide salts

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

Alloy and carbon tool steel

Magnet steel

High speed tool steel

All of these

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

Raises

Does not effect

Lowers

None of these

34. Induction hardening is the process of

Heating and cooling rapidly

Inducing hardness by continuous process

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

Increasing hardness throughout

35. Blast furnace is used to produce

Cast iron

Wrought iron

Pig iron

Steel

36. Solder is an alloy consisting of

Lead and zinc

Tin, antimony, copper

Tin and lead

Tin and copper

37. Corrosion resistance of steel is increased by addition of

Chromium and nickel

Vanadium, aluminium

Tungsten, molybdenum, vanadium, chromium

Sulphur, phosphorus, lead

38. Inconel is an alloy of

Nickel, zinc

Nickel, Chromium

Nickel, copper

Nickel, chromium and iron

39. Basic constituents of Monel metal are

Nickel, lead and tin

Nickel, molybdenum

Nickel, copper

Zinc, tin, lead

40. Maximum percentage of carbon in ferrite is

0.025%

0.1%

0.06%

0.25%

Engineering Materials Practice Set-7

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