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Engineering Materials
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Engineering Materials Practice Set-2

May 8, 2021

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Page 1 of 4

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

(C) Both (A) and (B)

(D) None of these

(B) A mixture of tar and burnt dolomite bricks

(A) Silica bricks

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

Coordination number

None of these

Space lattice

Atomic packing factor

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

Metallic bond

Covalent bond

None of these

Ionic bond

4. 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

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

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

5. Aluminium bronze contains

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

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

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

None of these

Less than

More than

Equal to

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

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

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

Below recrystallization temperature

1050°C

910°C

770°C

9. Addition of manganese to aluminium results in

One of the best known age and precipitation hardening systems

Improvement of casting characteristics

Improving machinability

Improvement of corrosion resistance

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

Volumetric defect

Line defect

Plane defect

Point defect

Page 2 of 4

11. Duralumin contains

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

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, 0.4 to 0.7% magnesium, 0.4 to 0.7% manganese and rest aluminium

12. Free cutting steels

Require minimum cutting force

Is used where rapid machining is the prime requirement

Contain carbon in free from

Can be cut freely

13. Structural steel contains following principal alloying elements

Lead, tin, aluminium

Nickel, chromium and manganese

Zinc, sulphur, and chromium

Tungsten, molybdenum and phosphorous

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

Silicon

Carbon

Manganese

Chromium

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

High ductility

Uniform strength in all directions

Ability of hold protective coating

High resistance to rusting and corrosion

16. Grey cast iron

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

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

Is also known as chilled cast iron 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

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

There is no change in grain size

The average grain size is a minimum

The grain size first increases and then decreases very rapidly

The grain size increases very rapidly

18. Pearlite consists of

13% ferrite and 87% cementite

13% carbon and 87% ferrite

13% cementite and 87% ferrite

6.67% carbon and 93.33% iron

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

Carbon

Silicon

Manganese

Sulphur

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

Optical microscope

Metallurgical microscope

X-ray techniques

Naked eye

Page 3 of 4

21. Monel metal contains

Malleable iron and zinc

Alloy of tin, lead and cadmium

63 to 67% nickel and 30% copper

88% copper and 10% tin and rest zinc

22. An eutectoid steel consists of

Pearlite and ferrite

Wholly austenite

Pearlite and cementite

Wholly pearlite

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

Soften material

Relieve stresses

Harden steel slightly

Improve machining characteristic

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

Solidus change

Molecular change

Allotropic change

Physical change

25. Admiralty gun metal contains

88% copper, 10% tin and rest zinc

Alloy of tin, lead and cadmium

63 to 67% nickel and 30% copper

Iron scrap and zinc

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

Mesomorphous material

Amorphous material

None of these

Crystalline material

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

γ-iron

δ-iron

β-iron

α-iron

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

800°C to 1000°C

400° to 700°C

1500°C to 1700°C

1200°C to 1300°C

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

Phosphor bronze

Solder admiralty

Fusible metal

White metal

30. Malleable 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

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

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

Page 4 of 4

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

Nickel steel

Ferritic stainless steel

Martenistic stainless steel

Austenitic stainless steel

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

Magnalium

Hindalium

Y-alloy

Duralumin

33. The correct sequence for descending order of machinability is

Wrought iron, grey cast iron, low carbon steel

Grey cast iron, low carbon steel, wrought iron

Low carbon steel, grey cast iron, wrought iron

Wrought iron, low carbon steel, grey cast iron

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

Remain same

Increases

None of these

Decreases

35. When medium carbon steel is heated to coarsening temperature

The grain size increases very rapidly

There is no change in grain size

The grain size first increases and then decreases very rapidly

The average grain size is a minimum

36. The percentage of carbon in pig iron varies from

2.5 to 4%

4 to 4.5%

0.1 to 1.2%

1.5 to 2.5%

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

Phosphorus

Manganese

Silicon

Sulphur

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

50 : 50

30 : 70

70 : 30

40 : 60

39. The presence of hydrogen in steel causes

Corrosion resistance

Reduced neutron absorption cross-section

Embrittlement

Improved Weldability

40. Sulphur in steel

Decreases tensile strength and hardness

Reduces the grain size

Lowers the toughness and transverse ductility

Acts as deoxidiser

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A Demrot is the founder of VideRime Online Learning, a leading engineering website. He did his BE Civil and M.Tech Structure from RGPV University, Bhopal and has been working as an Assistant Professor in a reputed college.

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