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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. Grey cast iron

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

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

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. 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

3. 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

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

Silicon

Sulphur

Phosphorus

Manganese

5. 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

6. Pearlite consists of

13% ferrite and 87% cementite

13% carbon and 87% ferrite

13% cementite and 87% ferrite

6.67% carbon and 93.33% iron

7. Addition of manganese to aluminium results in

Improving machinability

Improvement of corrosion resistance

One of the best known age and precipitation hardening systems

Improvement of casting characteristics

8. Admiralty gun metal contains

88% copper, 10% tin and rest zinc

63 to 67% nickel and 30% copper

Alloy of tin, lead and cadmium

Iron scrap and zinc

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

None of these

Amorphous material

Mesomorphous material

Crystalline material

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

Phosphor bronze

Fusible metal

White metal

Solder admiralty

Page 2 of 4

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

None of these

Equal to

Less than

More than

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

Improve machining characteristic

Soften material

Harden steel slightly

Relieve stresses

13. 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

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

X-ray techniques

Optical microscope

Naked eye

Metallurgical microscope

15. The percentage of carbon in pig iron varies from

2.5 to 4%

4 to 4.5%

1.5 to 2.5%

0.1 to 1.2%

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

50 : 50

70 : 30

40 : 60

30 : 70

17. Sulphur in steel

Acts as deoxidiser

Decreases tensile strength and hardness

Lowers the toughness and transverse ductility

Reduces the grain size

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

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

19. When medium carbon steel is heated to coarsening temperature

The average grain size is a minimum

The grain size increases very rapidly

There is no change in grain size

The grain size first increases and then decreases very rapidly

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

Silicon

Carbon

Chromium

Manganese

Page 3 of 4

21. 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

22. Aluminium bronze contains

90% magnesium and 9% aluminium with some copper

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

10% aluminium and 90% copper

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

23. Structural steel contains following principal alloying elements

Nickel, chromium and manganese

Zinc, sulphur, and chromium

Lead, tin, aluminium

Tungsten, molybdenum and phosphorous

24. 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

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

Carbon

Silicon

Manganese

Sulphur

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

27. The presence of hydrogen in steel causes

Corrosion resistance

Reduced neutron absorption cross-section

Improved Weldability

Embrittlement

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

Physical change

Allotropic change

Molecular change

Solidus change

29. 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

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

Magnalium

Hindalium

Duralumin

Y-alloy

Page 4 of 4

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

Below recrystallization temperature

770°C

910°C

1050°C

32. 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

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

400° to 700°C

800°C to 1000°C

1200°C to 1300°C

1500°C to 1700°C

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

β-iron

δ-iron

α-iron

γ-iron

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

Grey cast iron, low carbon steel, wrought iron

Low carbon steel, grey cast iron, wrought iron

36. 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

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

37. An eutectoid steel consists of

Wholly austenite

Wholly pearlite

Pearlite and cementite

Pearlite and ferrite

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

Point defect

Line defect

Volumetric defect

Plane defect

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

None of these

Decreases

Remain same

Increases

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

Ionic bond

Metallic bond

Covalent bond

None of these

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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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