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

Hindalium

Duralumin

Y-alloy

Magnalium

2. Addition of manganese to aluminium results in

Improvement of corrosion resistance

Improving machinability

Improvement of casting characteristics

One of the best known age and precipitation hardening systems

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

Optical microscope

Metallurgical microscope

Naked eye

X-ray techniques

4. Structural steel contains following principal alloying elements

Lead, tin, aluminium

Zinc, sulphur, and chromium

Nickel, chromium and manganese

Tungsten, molybdenum and phosphorous

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

α-iron

δ-iron

γ-iron

β-iron

6. Malleable cast iron

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

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 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

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

Improve machining characteristic

Relieve stresses

Soften material

Harden steel slightly

8. Ductile cast iron

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

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

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

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

Mesomorphous material

Crystalline material

Amorphous material

None of these

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

Equal to

More than

Less than

None of these

Page 2 of 4

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

Phosphor bronze

Solder admiralty

Fusible metal

White metal

12. The correct sequence for descending order of machinability is

Grey cast iron, low carbon steel, wrought iron

Wrought iron, low carbon steel, grey cast iron

Wrought iron, grey cast iron, low carbon steel

Low carbon steel, grey cast iron, wrought iron

13. Admiralty gun metal contains

Iron scrap and zinc

88% copper, 10% tin and rest zinc

Alloy of tin, lead and cadmium

63 to 67% nickel and 30% copper

14. The presence of hydrogen in steel causes

Improved Weldability

Embrittlement

Corrosion resistance

Reduced neutron absorption cross-section

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

910°C

770°C

Below recrystallization temperature

1050°C

16. Free cutting steels

Contain carbon in free from

Is used where rapid machining is the prime requirement

Require minimum cutting force

Can be cut freely

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

30 : 70

70 : 30

50 : 50

40 : 60

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

Carbon

Silicon

Sulphur

Manganese

19. Monel metal contains

88% copper and 10% tin and rest zinc

Alloy of tin, lead and cadmium

63 to 67% nickel and 30% copper

Malleable iron and zinc

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

Atomic packing factor

None of these

Coordination number

Space lattice

Page 3 of 4

21. An eutectoid steel consists of

Wholly austenite

Pearlite and cementite

Wholly pearlite

Pearlite and ferrite

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

Chromium

Manganese

Carbon

Silicon

23. When medium carbon steel is heated to coarsening temperature

The grain size increases very rapidly

There is no change in grain size

The average grain size is a minimum

The grain size first increases and then decreases very rapidly

24. Duralumin contains

5 to 6% tin, 2 to 3% 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

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

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

Uniform strength in all directions

High resistance to rusting and corrosion

High ductility

Ability of hold protective coating

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

1200°C to 1300°C

1500°C to 1700°C

400° to 700°C

800°C to 1000°C

27. The percentage of carbon in pig iron varies from

1.5 to 2.5%

4 to 4.5%

2.5 to 4%

0.1 to 1.2%

28. Pearlite consists of

13% cementite and 87% ferrite

13% ferrite and 87% cementite

13% carbon and 87% ferrite

6.67% carbon and 93.33% iron

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

Phosphorus

Sulphur

Manganese

Silicon

30. Aluminium bronze contains

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

10% aluminium and 90% copper

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

90% magnesium and 9% aluminium with some copper

Page 4 of 4

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

(D) None of these

(B) A mixture of tar and burnt dolomite bricks

(C) Both (A) and (B)

(A) Silica bricks

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

Ionic bond

None of these

Metallic bond

Covalent bond

33. 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 increases very rapidly

The grain size first increases and then decreases very rapidly

34. White 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 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

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

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

Plane defect

Volumetric defect

Line defect

Point defect

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

Ferritic stainless steel

Martenistic stainless steel

Nickel steel

Austenitic stainless steel

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

Physical change

Solidus change

Allotropic change

Molecular change

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

None of these

Increases

Decreases

Remain same

39. Grey cast iron

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

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

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

40. Sulphur in steel

Decreases tensile strength and hardness

Acts as deoxidiser

Reduces the grain size

Lowers the toughness and transverse ductility

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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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