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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

Plane defect

Volumetric defect

Point defect

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

None of these

Equal to

Less than

More than

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

Manganese

Carbon

Silicon

Sulphur

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

Ability of hold protective coating

High ductility

High resistance to rusting and corrosion

Uniform strength in all directions

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

Magnalium

Hindalium

Y-alloy

Duralumin

6. 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 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

7. 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

8. Admiralty gun metal contains

Alloy of tin, lead and cadmium

88% copper, 10% tin and rest zinc

Iron scrap and zinc

63 to 67% nickel and 30% copper

9. White 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 annealing process. It is soft, tough and easily machined metal

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

10. 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

Page 2 of 4

11. Pearlite consists of

6.67% carbon and 93.33% iron

13% carbon and 87% ferrite

13% cementite and 87% ferrite

13% ferrite and 87% cementite

12. Ductile cast iron

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

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 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

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

70 : 30

40 : 60

30 : 70

50 : 50

14. Addition of manganese to aluminium results in

One of the best known age and precipitation hardening systems

Improving machinability

Improvement of casting characteristics

Improvement of corrosion resistance

15. The correct sequence for descending order of machinability is

Grey cast iron, low carbon steel, wrought iron

Low carbon steel, grey cast iron, wrought iron

Wrought iron, low carbon steel, grey cast iron

Wrought iron, grey cast iron, low carbon steel

16. An eutectoid steel consists of

Wholly pearlite

Pearlite and cementite

Wholly austenite

Pearlite and ferrite

17. 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

18. 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

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

Crystalline material

Mesomorphous material

Amorphous material

None of these

20. Duralumin contains

5 to 6% tin, 2 to 3% 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

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

Page 3 of 4

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

Phosphor bronze

Solder admiralty

Fusible metal

White metal

22. Structural steel contains following principal alloying elements

Zinc, sulphur, and chromium

Nickel, chromium and manganese

Lead, tin, aluminium

Tungsten, molybdenum and phosphorous

23. 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

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

Below recrystallization temperature

1050°C

770°C

910°C

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

Chromium

Silicon

Manganese

Carbon

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

Metallurgical microscope

X-ray techniques

Optical microscope

Naked eye

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

(A) Silica bricks

(C) Both (A) and (B)

(D) None of these

(B) A mixture of tar and burnt dolomite bricks

28. Sulphur in steel

Acts as deoxidiser

Reduces the grain size

Decreases tensile strength and hardness

Lowers the toughness and transverse ductility

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

Harden steel slightly

Improve machining characteristic

Soften material

Relieve stresses

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

Increases

None of these

Remain same

Decreases

Page 4 of 4

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

Ionic bond

Covalent bond

Metallic bond

None of these

32. The percentage of carbon in pig iron varies from

1.5 to 2.5%

2.5 to 4%

4 to 4.5%

0.1 to 1.2%

33. Free cutting steels

Contain carbon in free from

Can be cut freely

Is used where rapid machining is the prime requirement

Require minimum cutting force

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

Sulphur

Manganese

Phosphorus

Silicon

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

400° to 700°C

1500°C to 1700°C

1200°C to 1300°C

800°C to 1000°C

36. 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

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

γ-iron

δ-iron

α-iron

β-iron

38. The presence of hydrogen in steel causes

Corrosion resistance

Embrittlement

Reduced neutron absorption cross-section

Improved Weldability

39. Aluminium bronze contains

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

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

90% magnesium and 9% aluminium with some copper

10% aluminium and 90% copper

40. When medium carbon steel is heated to coarsening temperature

The grain size first increases and then decreases very rapidly

The average grain size is a minimum

There is no change in grain size

The grain size increases very rapidly

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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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