Engineering Materials Practice Set-7

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

Deformation under stress

Fracture due to high impact loads

Externally applied forces with breakdown or yielding

None of these

2. The basic constituents of Hastelloy are

Aluminium, copper etc.

Nickel, Copper, etc.

All of the above

Nickel, molybdenum etc.

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

High speed steel

Heat resisting steel

Nickel steel

Stainless steel

4. Maximum percentage of carbon in ferrite is

0.025%

0.06%

0.25%

0.1%

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

(C) Both ‘A’ and ‘B’

(D) None of these

(A) Cementite

(B) Free graphite

6. Machining properties of steel are improved by adding

Silicon, aluminium, titanium

Vanadium, aluminium

Chromium, nickel

Sulphur, lead, phosphorous

7. 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

8. Induction hardening is the process of

Increasing hardness throughout

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

Inducing hardness by continuous process

Heating and cooling rapidly

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

Brittleness

Ductility

Plasticity

Malleability

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

Malleable

Anisotropic

Ductile

Homogeneous

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11. Shock resistance of steel is increased by adding

Chromium

Nickel

Sulphur, lead and phosphorus

Nickel and chromium

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

Nickel

Vanadium

Chromium

Cobalt

13. Process of Austempering results in

Formation of bainite structure

Martenistic structure

Lamellar layers of carbide distributed throughout the structure

Carburised structure

14. German silver contains

1% silver

2% silver

No silver

5% silver

15. The carbon in the pig iron varies from

5 to 10%

0.1 to 0.5%

0.5 to 1%

1 to 5%

16. Iron ore is usually found in the form of

Sulphides

All of these

Carbonates

Oxides

17. Hardness of steel depends on

Amount of carbon it contains

The shape and distribution of the carbides in iron

Contents of alloying elements

Method of fabrication

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

Raises

Lowers

None of these

Does not effect

19. Quenching is not necessary when hardening is done by

Any one of these

Flame hardening

Case hardening

Nitriding

20. Ball bearings are, usually, made from

Chrome steel

Medium carbon steel

Low carbon steel

High carbon steel

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21. Railway rails are normally made of

High carbon

Alloy steel

Tungsten steel

Mild steel

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

Invar

Silver metal

Duralumin

Hastelloy

23. Eutectoid steel contains following percentage of carbon

0.3%

0.8%

0.63%

0.02%

24. Basic constituents of Monel metal are

Nickel, lead and tin

Zinc, tin, lead

Nickel, molybdenum

Nickel, copper

25. The hardness of steel depends upon the

Contents of alloying elements

Amount of cementite it contains

Method of manufacture of steel

Amount of carbon it contains

26. Free carbon in iron makes the metal

Hard and gives a fine grained crystalline structure

Soft and gives a fine grained crystalline structure

Hard and gives a coarse grained crystalline structure

Soft and gives a coarse grained crystalline structure

27. Cyaniding is the process of

Dipping steel in cyanide bath

Obtaining cyanide salts

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

Reacting steel surface with cyanide salts

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

Manganese

Carbon

Vanadium

Cobalt

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

Gun metal

Brass

Muntz metal

Bronze

30. A cold chisel is made of

High carbon

Mild steel

Cast iron

H.S.S

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31. Blast furnace is used to produce

Pig iron

Wrought iron

Steel

Cast iron

32. Corrosion resistance of steel is increased by addition of

Chromium and nickel

Vanadium, aluminium

Tungsten, molybdenum, vanadium, chromium

Sulphur, phosphorus, lead

33. Hardness of martensite is about

RC 57

RC 48

RC 65

RC 80

34. An engineer's hammer is made of

Mild steel

Cast iron

Forged steel

High carbon steel

35. The blade of a power saw is made of

High speed steel

Malleable cast iron

Stainless steel

Boron steel

36. German silver is an alloy of

Nickel and copper

Refined silver

Nickel, Copper and zinc

Silver and some impurities

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

High speed tool steel

All of these

Alloy and carbon tool steel

Magnet steel

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

Chromium

Tungsten

Nickel

Vanadium

39. Inconel is an alloy of

Nickel, zinc

Nickel, Chromium

Nickel, chromium and iron

Nickel, copper

40. Solder is an alloy consisting of

Tin and lead

Tin, antimony, copper

Tin and copper

Lead and zinc

Engineering Materials Practice Set-7

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Engineering Materials Practice Set-7

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