Engineering Materials Practice Set-2

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1. In the lower part of the blast furnace (zone of fusion), the temperature is

1200°C to 1300°C

400° to 700°C

1500°C to 1700°C

800°C to 1000°C

2. The bond formed by transferring electrons from one atom to another is called

None of these

Metallic bond

Covalent bond

Ionic bond

3. Monel metal contains

88% copper and 10% tin and rest zinc

Malleable iron and zinc

63 to 67% nickel and 30% copper

Alloy of tin, lead and cadmium

4. The toughness of a material __________ when it is heated.

Increases

Decreases

None of these

Remain same

5. Aluminium bronze contains

10% aluminium and 90% copper

94% aluminium, 4% copper and 0.5% Mn, Mg, Si and Fe

90% magnesium and 9% aluminium with some copper

92.5% aluminium, 4% copper, 2% nickel, and 1.5% Mg

6. Which of the following is added in low carbon steels to prevent them from becoming porous?

Sulphur

Silicon

Manganese

Phosphorus

7. Crystal structure of a material is, generally, examined by

Naked eye

X-ray techniques

Metallurgical microscope

Optical microscope

8. Duralumin contains

5 to 6% tin, 2 to 3% copper and rest aluminium

4 to 4.5% magnesium, 3 to 4% copper and rest aluminium

3.5 to 4.5% copper, 1.2 to 1.7% manganese, 1.8 to 2.3% nickel, 0.6% each of silicon, magnesium and iron, and rest aluminium

3.5 to 4.5% copper, 0.4 to 0.7% magnesium, 0.4 to 0.7% manganese and rest aluminium

9. Structural steel contains following principal alloying elements

Tungsten, molybdenum and phosphorous

Lead, tin, aluminium

Nickel, chromium and manganese

Zinc, sulphur, and chromium

10. The material in which the atoms are arranged chaotically, is called

Crystalline material

None of these

Amorphous material

Mesomorphous material

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11. The aluminium alloy, mainly used, for anodized utensil manufacture, is

Hindalium

Y-alloy

Magnalium

Duralumin

12. White cast iron

Is produced by small additions of magnesium (or creium) in the ladle. Graphite is in nodular or spheroidal form and is well dispersed throughout the material

Contains 1.7 to 3.5% carbon in Free State and is obtained by the slow cooling of molten cast iron

Is produced by annealing process. It is soft, tough and easily machined metal

Is also known as chilled cast iron and is obtained by cooling rapidly. It is almost unmachinable

13. Which is false statement about annealing? Annealing is done to

Harden steel slightly

Relieve stresses

Improve machining characteristic

Soften material

14. Sulphur in steel

Reduces the grain size

Acts as deoxidiser

Lowers the toughness and transverse ductility

Decreases tensile strength and hardness

15. In basic Bessemer process, the furnace is lined with

(C) Both (A) and (B)

(A) Silica bricks

(B) A mixture of tar and burnt dolomite bricks

(D) None of these

16. Which of the following element results in presence of free graphite in C.I.?

Silicon

Carbon

Sulphur

Manganese

17. The percentage of carbon in pig iron varies from

0.1 to 1.2%

1.5 to 2.5%

4 to 4.5%

2.5 to 4%

18. The ratio of the volume occupied by the atoms to the total volume of the unit cell is called

Space lattice

Atomic packing factor

None of these

Coordination number

19. Admiralty brass used for steam condenser tubes contains copper and zinc in the following ratio

50 : 50

30 : 70

70 : 30

40 : 60

20. Which of the following alloys does not contain tin?

Solder admiralty

Phosphor bronze

Fusible metal

White metal

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21. When low carbon steel is heated up to upper critical temperature

The grain size first increases and then decreases very rapidly

There is no change in grain size

The grain size increases very rapidly

The average grain size is a minimum

22. Which is the false statement about wrought iron? It has

High resistance to rusting and corrosion

Uniform strength in all directions

High ductility

Ability of hold protective coating

23. When medium carbon steel is heated to coarsening temperature

The grain size increases very rapidly

The average grain size is a minimum

There is no change in grain size

The grain size first increases and then decreases very rapidly

24. Malleable cast iron

Contains 1.7 to 3.5% carbon in Free State and is obtained by the slow cooling of molten cast iron

Is produced by annealing process. It is soft, tough, and easily machined metal

Is produced by small additions of magnesium (or cerium) in the ladle. Graphite is in the nodular or spheroidal form and is well dispersed throughout the material

Is also known as chilled cast iron and is obtained by cooling rapidly. It is almost unmachinable

25. Free cutting steels

Contain carbon in free from

Can be cut freely

Require minimum cutting force

Is used where rapid machining is the prime requirement

26. A steel containing 16 to 18% chromium and about 0.12% carbon is called

Nickel steel

Martenistic stainless steel

Ferritic stainless steel

Austenitic stainless steel

27. Dislocations in materials refer to the following type of defect

Volumetric defect

Point defect

Plane defect

Line defect

28. Pearlite consists of

13% carbon and 87% ferrite

13% cementite and 87% ferrite

6.67% carbon and 93.33% iron

13% ferrite and 87% cementite

29. The temperature at which ferromagnetic alpha iron transforms to paramagnetic alpha iron is

1050°C

Below recrystallization temperature

910°C

770°C

30. Admiralty gun metal contains

Alloy of tin, lead and cadmium

Iron scrap and zinc

63 to 67% nickel and 30% copper

88% copper, 10% tin and rest zinc

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31. The correct sequence for descending order of machinability is

Wrought iron, grey cast iron, low carbon steel

Wrought iron, low carbon steel, grey cast iron

Grey cast iron, low carbon steel, wrought iron

Low carbon steel, grey cast iron, wrought iron

32. Ductile cast iron

Is also known as chilled cast iron and is obtained by cooling rapidly. It is almost unmachinable

Contains 1.7 to 3.5% carbon in Free State and is obtained by the slow cooling of molten cast iron

Is produced by small additions of magnesium (or creium) in the ladle. Graphite is in nodular or spheroidal form and is well dispersed throughout the material

Is produced by annealing process. It is soft, tough and easily machined metal

33. The alloy, mainly used for corrosion resistance in stainless steels is

Carbon

Silicon

Chromium

Manganese

34. Addition of manganese to aluminium results in

Improving machinability

One of the best known age and precipitation hardening systems

Improvement of corrosion resistance

Improvement of casting characteristics

35. Which of the following iron exist between 910°C and 1403°C?

β-iron

δ-iron

α-iron

γ-iron

36. The compressive strength of cast iron is __________that of its tensile strength.

More than

Equal to

None of these

Less than

37. Grey cast iron

Contains 1.7 to 3.5% carbon in Free State and is obtained by the slow cooling of molten cast iron

Is also known as chilled cast iron is obtained by cooling rapidly. It is almost unmachinable

Is produced by annealing process. I is soft, tough and easily machined metal

Is produced by small additions o magnesium (or cerium) in the ladle Graphite is in nodular or spheroidal form and is well dispersed throughout the material

38. The presence of hydrogen in steel causes

Corrosion resistance

Embrittlement

Improved Weldability

Reduced neutron absorption cross-section

39. An eutectoid steel consists of

Wholly austenite

Pearlite and cementite

Wholly pearlite

Pearlite and ferrite

40. A reversible change in the atomic structure of steel with corresponding change in the properties is known as

Molecular change

Solidus change

Physical change

Allotropic change

Engineering Materials Practice Set-2

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