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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. Dislocations in materials refer to the following type of defect

Line defect

Volumetric defect

Point defect

Plane defect

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

910°C

770°C

Below recrystallization temperature

1050°C

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

The average grain size is a minimum

The grain size first increases and then decreases very rapidly

There is no change in grain size

The grain size increases very rapidly

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

β-iron

δ-iron

γ-iron

α-iron

5. Admiralty gun metal contains

63 to 67% nickel and 30% copper

Iron scrap and zinc

Alloy of tin, lead and cadmium

88% copper, 10% tin and rest zinc

6. Sulphur in steel

Reduces the grain size

Acts as deoxidiser

Decreases tensile strength and hardness

Lowers the toughness and transverse ductility

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

Allotropic change

Physical change

Solidus change

Molecular change

8. 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

9. Malleable 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

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

10. Free cutting steels

Contain carbon in free from

Is used where rapid machining is the prime requirement

Can be cut freely

Require minimum cutting force

Page 2 of 4

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

Metallurgical microscope

Optical microscope

Naked eye

X-ray techniques

12. The correct sequence for descending order of machinability is

Low carbon steel, grey cast iron, wrought iron

Wrought iron, low carbon steel, grey cast iron

Grey cast iron, low carbon steel, wrought iron

Wrought iron, grey cast iron, low carbon steel

13. An eutectoid steel consists of

Wholly pearlite

Wholly austenite

Pearlite and cementite

Pearlite and ferrite

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

None of these

Coordination number

Space lattice

Atomic packing factor

15. When medium carbon steel is heated to coarsening temperature

The grain size increases very rapidly

The grain size first increases and then decreases very rapidly

There is no change in grain size

The average grain size is a minimum

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

Phosphor bronze

Solder admiralty

White metal

Fusible metal

17. 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

18. The percentage of carbon in pig iron varies from

2.5 to 4%

0.1 to 1.2%

1.5 to 2.5%

4 to 4.5%

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

Manganese

Silicon

Phosphorus

Sulphur

20. Structural steel contains following principal alloying elements

Lead, tin, aluminium

Zinc, sulphur, and chromium

Nickel, chromium and manganese

Tungsten, molybdenum and phosphorous

Page 3 of 4

21. Duralumin contains

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

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

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

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

800°C to 1000°C

1200°C to 1300°C

400° to 700°C

1500°C to 1700°C

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

Less than

More than

None of these

Equal to

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

None of these

Remain same

Decreases

Increases

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

(A) Silica bricks

(D) None of these

(C) Both (A) and (B)

(B) A mixture of tar and burnt dolomite bricks

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

30 : 70

40 : 60

50 : 50

70 : 30

27. Monel metal contains

88% copper and 10% tin and rest zinc

63 to 67% nickel and 30% copper

Malleable iron and zinc

Alloy of tin, lead and cadmium

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

Covalent bond

Ionic bond

Metallic bond

None of these

29. Aluminium bronze contains

90% magnesium and 9% aluminium with some copper

10% aluminium and 90% copper

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

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

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

Crystalline material

None of these

Amorphous material

Mesomorphous material

Page 4 of 4

31. 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

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

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

Ferritic stainless steel

Nickel steel

Martenistic stainless steel

Austenitic stainless steel

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

Silicon

Carbon

Chromium

Manganese

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

Relieve stresses

Improve machining characteristic

Harden steel slightly

Soften material

35. Pearlite consists of

13% cementite and 87% ferrite

13% carbon and 87% ferrite

6.67% carbon and 93.33% iron

13% ferrite and 87% cementite

36. 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

37. 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

38. The presence of hydrogen in steel causes

Corrosion resistance

Reduced neutron absorption cross-section

Improved Weldability

Embrittlement

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

Silicon

Sulphur

Carbon

Manganese

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

Magnalium

Duralumin

Y-alloy

Hindalium

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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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