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Engineering Materials
1

Engineering Materials Practice Set-2

May 8, 2021

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Page 1 of 4

1. 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 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

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

2. 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, 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

3. When medium carbon steel is heated to coarsening temperature

The grain size first increases and then decreases very rapidly

The grain size increases very rapidly

There is no change in grain size

The average grain size is a minimum

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

(D) None of these

(B) A mixture of tar and burnt dolomite bricks

(A) Silica bricks

(C) Both (A) and (B)

5. Malleable 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

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

6. The presence of hydrogen in steel causes

Improved Weldability

Embrittlement

Corrosion resistance

Reduced neutron absorption cross-section

7. Sulphur in steel

Reduces the grain size

Decreases tensile strength and hardness

Lowers the toughness and transverse ductility

Acts as deoxidiser

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

Equal to

Less than

More than

None of these

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

None of these

Atomic packing factor

Coordination number

Space lattice

10. Monel metal contains

Malleable iron and zinc

Alloy of tin, lead and cadmium

63 to 67% nickel and 30% copper

88% copper and 10% tin and rest zinc

Page 2 of 4

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

Carbon

Manganese

Silicon

Sulphur

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

Naked eye

Optical microscope

Metallurgical microscope

X-ray techniques

13. The correct sequence for descending order of machinability is

Low carbon steel, grey cast iron, wrought iron

Grey cast iron, low carbon steel, wrought iron

Wrought iron, low carbon steel, grey cast iron

Wrought iron, grey cast iron, low carbon steel

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

High resistance to rusting and corrosion

Uniform strength in all directions

Ability of hold protective coating

High ductility

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

Fusible metal

Phosphor bronze

White metal

Solder admiralty

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

40 : 60

30 : 70

70 : 30

50 : 50

17. 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

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

Sulphur

Phosphorus

Silicon

Manganese

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

δ-iron

β-iron

γ-iron

α-iron

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

Volumetric defect

Point defect

Line defect

Plane defect

Page 3 of 4

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

Manganese

Silicon

Chromium

Carbon

22. Structural steel contains following principal alloying elements

Tungsten, molybdenum and phosphorous

Nickel, chromium and manganese

Zinc, sulphur, and chromium

Lead, tin, aluminium

23. Addition of manganese to aluminium results in

Improvement of casting characteristics

Improving machinability

Improvement of corrosion resistance

One of the best known age and precipitation hardening systems

24. 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

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

Remain same

Decreases

Increases

None of these

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

Crystalline material

Mesomorphous material

None of these

Amorphous material

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

770°C

910°C

Below recrystallization temperature

1050°C

28. Pearlite consists of

13% cementite and 87% ferrite

13% carbon and 87% ferrite

13% ferrite and 87% cementite

6.67% carbon and 93.33% iron

29. Free cutting steels

Require minimum cutting force

Is used where rapid machining is the prime requirement

Contain carbon in free from

Can be cut freely

30. Admiralty gun metal contains

Iron scrap and zinc

Alloy of tin, lead and cadmium

88% copper, 10% tin and rest zinc

63 to 67% nickel and 30% copper

Page 4 of 4

31. Ductile 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

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

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

Magnalium

Y-alloy

Hindalium

Duralumin

33. Aluminium bronze contains

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

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

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

Austenitic stainless steel

Martenistic stainless steel

Ferritic stainless steel

Nickel steel

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

Harden steel slightly

Improve machining characteristic

Soften material

Relieve stresses

36. The percentage of carbon in pig iron varies from

1.5 to 2.5%

0.1 to 1.2%

2.5 to 4%

4 to 4.5%

37. 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

38. An eutectoid steel consists of

Wholly austenite

Wholly pearlite

Pearlite and cementite

Pearlite and ferrite

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

Ionic bond

Metallic bond

None of these

Covalent bond

40. 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

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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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