Engineering Materials Practice Set-7

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1. Shock resistance of steel is increased by adding

Chromium

Nickel

Nickel and chromium

Sulphur, lead and phosphorus

2. Blast furnace is used to produce

Pig iron

Steel

Wrought iron

Cast iron

3. Basic constituents of Monel metal are

Zinc, tin, lead

Nickel, copper

Nickel, lead and tin

Nickel, molybdenum

4. Railway rails are normally made of

Alloy steel

High carbon

Mild steel

Tungsten steel

5. The basic constituents of Hastelloy are

Nickel, Copper, etc.

Nickel, molybdenum etc.

Aluminium, copper etc.

All of the above

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

Deformation under stress

Fracture due to high impact loads

None of these

Externally applied forces with breakdown or yielding

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

Lowers

Does not effect

None of these

Raises

8. 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

9. German silver contains

1% silver

No silver

5% silver

2% silver

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

Creep

Visco elasticity

Hysteresis

Boeschinger effect

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11. Quenching is not necessary when hardening is done by

Flame hardening

Case hardening

Nitriding

Any one of these

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

Muntz metal

Bronze

Gun metal

Brass

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

Nickel steel

Heat resisting steel

High speed steel

Stainless steel

14. Hardness of steel depends on

Method of fabrication

The shape and distribution of the carbides in iron

Contents of alloying elements

Amount of carbon it contains

15. Cyaniding is the process of

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

Obtaining cyanide salts

16. The hardness of steel depends upon the

Amount of cementite it contains

Contents of alloying elements

Method of manufacture of steel

Amount of carbon it contains

17. Iron ore is usually found in the form of

All of these

Sulphides

Oxides

Carbonates

18. Process of Austempering results in

Formation of bainite structure

Lamellar layers of carbide distributed throughout the structure

Carburised structure

Martenistic structure

19. A cold chisel is made of

Mild steel

High carbon

H.S.S

Cast iron

20. The carbon in the pig iron varies from

0.1 to 0.5%

0.5 to 1%

1 to 5%

5 to 10%

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21. An engineer's hammer is made of

High carbon steel

Cast iron

Mild steel

Forged steel

22. Machining properties of steel are improved by adding

Vanadium, aluminium

Sulphur, lead, phosphorous

Silicon, aluminium, titanium

Chromium, nickel

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

Homogeneous

Malleable

Anisotropic

Ductile

24. Eutectoid steel contains following percentage of carbon

0.02%

0.63%

0.3%

0.8%

25. Induction hardening is the process of

Inducing hardness by continuous process

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

Heating and cooling rapidly

Increasing hardness throughout

26. Hardness of martensite is about

RC 80

RC 65

RC 57

RC 48

27. Solder is an alloy consisting of

Tin and copper

Lead and zinc

Tin and lead

Tin, antimony, copper

28. Maximum percentage of carbon in ferrite is

0.1%

0.06%

0.25%

0.025%

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

Vanadium

Tungsten

Chromium

Nickel

30. Inconel is an alloy of

Nickel, copper

Nickel, chromium and iron

Nickel, zinc

Nickel, Chromium

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31. Corrosion resistance of steel is increased by addition of

Tungsten, molybdenum, vanadium, chromium

Vanadium, aluminium

Chromium and nickel

Sulphur, phosphorus, lead

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

All of these

High speed tool steel

Magnet steel

Alloy and carbon tool steel

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

Cobalt

Carbon

Vanadium

Manganese

34. Free carbon in iron makes the metal

Soft and gives a fine grained crystalline structure

Soft and gives a coarse grained crystalline structure

Hard and gives a coarse grained crystalline structure

Hard and gives a fine grained crystalline structure

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

Brittleness

Plasticity

Ductility

Malleability

36. Ball bearings are, usually, made from

High carbon steel

Medium carbon steel

Low carbon steel

Chrome steel

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

Cobalt

Nickel

Vanadium

Chromium

38. German silver is an alloy of

Silver and some impurities

Nickel, Copper and zinc

Refined silver

Nickel and copper

39. The blade of a power saw is made of

Boron steel

Stainless steel

High speed steel

Malleable cast iron

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

Invar

Duralumin

Hastelloy

Silver metal

Engineering Materials Practice Set-7

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