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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. Malleable 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 cerium) in the ladle. Graphite is in the nodular or spheroidal form and is well dispersed throughout the material

2. Aluminium bronze contains

90% magnesium and 9% aluminium with some copper

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

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

10% aluminium and 90% copper

3. Duralumin contains

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

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

4. Sulphur in steel

Reduces the grain size

Acts as deoxidiser

Decreases tensile strength and hardness

Lowers the toughness and transverse ductility

5. Monel metal contains

Alloy of tin, lead and cadmium

88% copper and 10% tin and rest zinc

63 to 67% nickel and 30% copper

Malleable iron and zinc

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

Solidus change

Physical change

Allotropic change

Molecular change

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

High ductility

High resistance to rusting and corrosion

Uniform strength in all directions

Ability of hold protective coating

8. An eutectoid steel consists of

Wholly pearlite

Wholly austenite

Pearlite and ferrite

Pearlite and cementite

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

910°C

1050°C

770°C

Below recrystallization temperature

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

Metallurgical microscope

Optical microscope

Naked eye

X-ray techniques

Page 2 of 4

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

Nickel steel

Martenistic stainless steel

Austenitic stainless steel

Ferritic stainless steel

12. The percentage of carbon in pig iron varies from

2.5 to 4%

0.1 to 1.2%

4 to 4.5%

1.5 to 2.5%

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

More than

None of these

Less than

Equal to

14. The presence of hydrogen in steel causes

Embrittlement

Corrosion resistance

Improved Weldability

Reduced neutron absorption cross-section

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

There is no change in grain size

The grain size first increases and then decreases very rapidly

The grain size increases very rapidly

The average grain size is a minimum

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

None of these

Mesomorphous material

Crystalline material

Amorphous material

17. Admiralty gun metal contains

Alloy of tin, lead and cadmium

63 to 67% nickel and 30% copper

88% copper, 10% tin and rest zinc

Iron scrap and zinc

18. White 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 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

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

None of these

Decreases

Increases

Remain same

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

Duralumin

Magnalium

Y-alloy

Hindalium

Page 3 of 4

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

Harden steel slightly

Improve machining characteristic

Relieve stresses

Soften material

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

Metallic bond

Ionic bond

None of these

Covalent bond

23. When medium carbon steel is heated to coarsening 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

24. Grey cast iron

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

25. Structural steel contains following principal alloying elements

Nickel, chromium and manganese

Zinc, sulphur, and chromium

Tungsten, molybdenum and phosphorous

Lead, tin, aluminium

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

50 : 50

40 : 60

70 : 30

30 : 70

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

Carbon

Manganese

Silicon

Chromium

28. Addition of manganese to aluminium results in

Improving machinability

Improvement of casting characteristics

One of the best known age and precipitation hardening systems

Improvement of corrosion resistance

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

Sulphur

Phosphorus

Manganese

Silicon

30. 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

Page 4 of 4

31. 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

Wrought iron, grey cast iron, low carbon steel

Grey cast iron, low carbon steel, wrought iron

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

Manganese

Silicon

Carbon

Sulphur

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

1200°C to 1300°C

800°C to 1000°C

1500°C to 1700°C

400° to 700°C

34. 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 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

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

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

White metal

Solder admiralty

Phosphor bronze

Fusible metal

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

β-iron

α-iron

γ-iron

δ-iron

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

Plane defect

Volumetric defect

Line defect

Point defect

38. 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

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

(C) Both (A) and (B)

(D) None of these

(A) Silica bricks

(B) A mixture of tar and burnt dolomite bricks

40. Pearlite consists of

13% cementite and 87% ferrite

6.67% carbon and 93.33% iron

13% carbon and 87% ferrite

13% ferrite and 87% cementite

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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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