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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. Monel metal contains

88% copper and 10% tin and rest zinc

Alloy of tin, lead and cadmium

Malleable iron and zinc

63 to 67% nickel and 30% copper

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

Crystalline material

Mesomorphous material

None of these

Amorphous material

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

Coordination number

Atomic packing factor

None of these

Space lattice

4. 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

5. 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

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

6. Admiralty gun metal contains

63 to 67% nickel and 30% copper

Alloy of tin, lead and cadmium

88% copper, 10% tin and rest zinc

Iron scrap and zinc

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

Silicon

Carbon

Manganese

Sulphur

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

Harden steel slightly

Soften material

Relieve stresses

Improve machining characteristic

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

Y-alloy

Duralumin

Hindalium

Magnalium

10. Duralumin contains

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

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

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

Naked eye

Metallurgical microscope

X-ray techniques

Optical microscope

13. Structural steel contains following principal alloying elements

Zinc, sulphur, and chromium

Nickel, chromium and manganese

Tungsten, molybdenum and phosphorous

Lead, tin, aluminium

14. The percentage of carbon in pig iron varies from

0.1 to 1.2%

2.5 to 4%

1.5 to 2.5%

4 to 4.5%

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

Phosphor bronze

White metal

Solder admiralty

Fusible metal

16. Aluminium bronze contains

90% magnesium and 9% aluminium with some copper

10% aluminium and 90% copper

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

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

17. The presence of hydrogen in steel causes

Corrosion resistance

Embrittlement

Reduced neutron absorption cross-section

Improved Weldability

18. When medium carbon steel is heated to coarsening temperature

The grain size increases very rapidly

There is no change in grain size

The average grain size is a minimum

The grain size first increases and then decreases very rapidly

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

910°C

770°C

1050°C

Below recrystallization temperature

20. Ductile 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

Page 3 of 4

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

β-iron

γ-iron

δ-iron

α-iron

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

Molecular change

Solidus change

Physical change

Allotropic change

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

None of these

Increases

Remain same

Decreases

24. An eutectoid steel consists of

Pearlite and ferrite

Wholly pearlite

Wholly austenite

Pearlite and cementite

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

Plane defect

Line defect

Point defect

Volumetric defect

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

50 : 50

40 : 60

30 : 70

70 : 30

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

Chromium

Carbon

Manganese

Silicon

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

Sulphur

Phosphorus

Manganese

Silicon

29. 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

30. 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

Page 4 of 4

31. Sulphur in steel

Lowers the toughness and transverse ductility

Reduces the grain size

Decreases tensile strength and hardness

Acts as deoxidiser

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

More than

Less than

None of these

Equal to

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

There is no change in grain size

The grain size increases very rapidly

The average grain size is a minimum

The grain size first increases and then decreases very rapidly

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

(D) None of these

(C) Both (A) and (B)

(B) A mixture of tar and burnt dolomite bricks

(A) Silica bricks

35. Addition of manganese to aluminium results in

Improvement of casting characteristics

Improvement of corrosion resistance

Improving machinability

One of the best known age and precipitation hardening systems

36. 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, grey cast iron, low carbon steel

Wrought iron, low carbon steel, grey cast iron

37. White cast iron

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

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

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

800°C to 1000°C

1200°C to 1300°C

400° to 700°C

1500°C to 1700°C

39. Malleable 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 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

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

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

None of these

Metallic bond

Ionic bond

Covalent bond

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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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