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

The average grain size is a minimum

There is no change in grain size

The grain size first increases and then decreases very rapidly

The grain size increases very rapidly

2. 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

3. Aluminium bronze contains

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

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

4. 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

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

Metallurgical microscope

Naked eye

Optical microscope

X-ray techniques

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

Austenitic stainless steel

Martenistic stainless steel

Nickel steel

Ferritic stainless steel

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

Soften material

Improve machining characteristic

Harden steel slightly

Relieve stresses

8. The presence of hydrogen in steel causes

Reduced neutron absorption cross-section

Improved Weldability

Corrosion resistance

Embrittlement

9. Sulphur in steel

Acts as deoxidiser

Reduces the grain size

Lowers the toughness and transverse ductility

Decreases tensile strength and hardness

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

Phosphor bronze

White metal

Solder admiralty

Fusible metal

Page 2 of 4

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

Below recrystallization temperature

1050°C

910°C

770°C

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

Increases

Remain same

None of these

Decreases

13. 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

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

(B) A mixture of tar and burnt dolomite bricks

(A) Silica bricks

(D) None of these

(C) Both (A) and (B)

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

800°C to 1000°C

1500°C to 1700°C

400° to 700°C

1200°C to 1300°C

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

Ionic bond

Metallic bond

Covalent bond

None of these

17. When medium carbon steel is heated to coarsening temperature

The average grain size is a minimum

The grain size increases very rapidly

The grain size first increases and then decreases very rapidly

There is no change in grain size

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

Amorphous material

Mesomorphous material

Crystalline material

None of these

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

Silicon

Sulphur

Phosphorus

Manganese

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

Uniform strength in all directions

Ability of hold protective coating

High ductility

High resistance to rusting and corrosion

Page 3 of 4

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

Chromium

Silicon

Carbon

Manganese

22. 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

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

Point defect

Line defect

Plane defect

Volumetric defect

24. White 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

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

25. Free cutting steels

Require minimum cutting force

Contain carbon in free from

Can be cut freely

Is used where rapid machining is the prime requirement

26. Malleable 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

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

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

Duralumin

Y-alloy

Magnalium

Hindalium

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

Space lattice

Coordination number

None of these

Atomic packing factor

29. 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%

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

50 : 50

70 : 30

40 : 60

30 : 70

Page 4 of 4

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

Sulphur

Silicon

Carbon

Manganese

32. 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

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

α-iron

β-iron

γ-iron

δ-iron

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

More than

None of these

Equal to

Less than

35. The correct sequence for descending order of machinability is

Wrought iron, low carbon steel, grey cast iron

Wrought iron, grey cast iron, low carbon steel

Low carbon steel, grey cast iron, wrought iron

Grey cast iron, low carbon steel, wrought iron

36. Structural steel contains following principal alloying elements

Nickel, chromium and manganese

Zinc, sulphur, and chromium

Lead, tin, aluminium

Tungsten, molybdenum and phosphorous

37. Ductile 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

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

38. Addition of manganese to aluminium results in

One of the best known age and precipitation hardening systems

Improvement of casting characteristics

Improvement of corrosion resistance

Improving machinability

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

Allotropic change

Molecular change

Solidus change

Physical change

40. An eutectoid steel consists of

Pearlite and ferrite

Pearlite and cementite

Wholly pearlite

Wholly austenite

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VideRime

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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