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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. White 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

2. The presence of hydrogen in steel causes

Improved Weldability

Reduced neutron absorption cross-section

Corrosion resistance

Embrittlement

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

More than

None of these

Equal to

Less than

4. An eutectoid steel consists of

Wholly pearlite

Wholly austenite

Pearlite and cementite

Pearlite and ferrite

5. 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

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

800°C to 1000°C

1200°C to 1300°C

1500°C to 1700°C

400° to 700°C

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

8. Structural steel contains following principal alloying elements

Zinc, sulphur, and chromium

Lead, tin, aluminium

Nickel, chromium and manganese

Tungsten, molybdenum and phosphorous

9. Addition of manganese to aluminium results in

Improving machinability

Improvement of casting characteristics

Improvement of corrosion resistance

One of the best known age and precipitation hardening systems

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

Uniform strength in all directions

High ductility

Ability of hold protective coating

High resistance to rusting and corrosion

Page 2 of 4

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

Mesomorphous material

None of these

Crystalline material

Amorphous material

12. The percentage of carbon in pig iron varies from

4 to 4.5%

1.5 to 2.5%

0.1 to 1.2%

2.5 to 4%

13. Grey cast iron

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

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

14. Monel metal contains

63 to 67% nickel and 30% copper

Malleable iron and zinc

Alloy of tin, lead and cadmium

88% copper and 10% tin and rest zinc

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

70 : 30

30 : 70

50 : 50

40 : 60

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

White metal

Solder admiralty

Phosphor bronze

Fusible metal

17. Admiralty gun metal contains

Alloy of tin, lead and cadmium

Iron scrap and zinc

88% copper, 10% tin and rest zinc

63 to 67% nickel and 30% copper

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

Y-alloy

Hindalium

Magnalium

Duralumin

19. Malleable 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 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

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

20. When medium carbon steel is heated to coarsening temperature

There is no change in grain size

The grain size first increases and then decreases very rapidly

The average grain size is a minimum

The grain size increases very rapidly

Page 3 of 4

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

Manganese

Silicon

Carbon

Chromium

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

Optical microscope

Naked eye

Metallurgical microscope

X-ray techniques

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

Relieve stresses

Soften material

Improve machining characteristic

Harden steel slightly

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

None of these

Space lattice

Coordination number

Atomic packing factor

25. Free cutting steels

Is used where rapid machining is the prime requirement

Can be cut freely

Require minimum cutting force

Contain carbon in free from

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

Sulphur

Manganese

Silicon

Carbon

27. 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

28. 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

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

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

770°C

Below recrystallization temperature

910°C

1050°C

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

Ionic bond

None of these

Covalent bond

Metallic bond

Page 4 of 4

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

Sulphur

Manganese

Silicon

Phosphorus

32. Sulphur in steel

Reduces the grain size

Decreases tensile strength and hardness

Lowers the toughness and transverse ductility

Acts as deoxidiser

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

(C) Both (A) and (B)

(D) None of these

(B) A mixture of tar and burnt dolomite bricks

(A) Silica bricks

34. Duralumin contains

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

4 to 4.5% magnesium, 3 to 4% copper and rest aluminium

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

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

Plane defect

Volumetric defect

Point defect

Line defect

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

α-iron

β-iron

δ-iron

γ-iron

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

Physical change

Molecular change

Allotropic change

Solidus change

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

Martenistic stainless steel

Nickel steel

Ferritic stainless steel

Austenitic stainless steel

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

Decreases

None of these

Remain same

Increases

40. 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

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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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