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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 medium carbon steel is heated to coarsening temperature

The grain size first increases and then decreases very rapidly

The average grain size is a minimum

The grain size increases very rapidly

There is no change in grain size

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

Martenistic stainless steel

Ferritic stainless steel

Austenitic stainless steel

Nickel steel

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

Amorphous material

None of these

Mesomorphous material

Crystalline material

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

Ionic bond

Covalent bond

Metallic bond

None of these

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

Hindalium

Magnalium

Duralumin

Y-alloy

6. The presence of hydrogen in steel causes

Corrosion resistance

Improved Weldability

Reduced neutron absorption cross-section

Embrittlement

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

Sulphur

Silicon

Manganese

Phosphorus

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

Harden steel slightly

Improve machining characteristic

Relieve stresses

Soften material

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

Sulphur

Manganese

Carbon

Silicon

10. 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

Page 2 of 4

11. Admiralty gun metal contains

88% copper, 10% tin and rest zinc

Alloy of tin, lead and cadmium

Iron scrap and zinc

63 to 67% nickel and 30% copper

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

1050°C

770°C

910°C

Below recrystallization temperature

13. 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

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

14. 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

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

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

Atomic packing factor

Coordination number

Space lattice

None of these

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

Optical microscope

Naked eye

X-ray techniques

Metallurgical microscope

17. Free cutting steels

Can be cut freely

Is used where rapid machining is the prime requirement

Require minimum cutting force

Contain carbon in free from

18. 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

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

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

19. Structural steel contains following principal alloying elements

Nickel, chromium and manganese

Zinc, sulphur, and chromium

Lead, tin, aluminium

Tungsten, molybdenum and phosphorous

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

Ability of hold protective coating

Uniform strength in all directions

High ductility

High resistance to rusting and corrosion

Page 3 of 4

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

More than

None of these

Less than

Equal to

22. Ductile 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

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

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

Fusible metal

Phosphor bronze

White metal

Solder admiralty

24. An eutectoid steel consists of

Pearlite and cementite

Wholly pearlite

Wholly austenite

Pearlite and ferrite

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

δ-iron

β-iron

γ-iron

α-iron

26. Pearlite consists of

13% carbon and 87% ferrite

6.67% carbon and 93.33% iron

13% cementite and 87% ferrite

13% ferrite and 87% cementite

27. 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

28. Addition of manganese to aluminium results in

Improving machinability

One of the best known age and precipitation hardening systems

Improvement of corrosion resistance

Improvement of casting characteristics

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

1500°C to 1700°C

400° to 700°C

1200°C to 1300°C

800°C to 1000°C

30. Monel metal contains

88% copper and 10% tin and rest zinc

Malleable iron and zinc

Alloy of tin, lead and cadmium

63 to 67% nickel and 30% copper

Page 4 of 4

31. 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

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

Volumetric defect

Line defect

Point defect

Plane defect

33. The percentage of carbon in pig iron varies from

0.1 to 1.2%

1.5 to 2.5%

4 to 4.5%

2.5 to 4%

34. The correct sequence for descending order of machinability is

Wrought iron, low carbon steel, grey cast iron

Low carbon steel, grey cast iron, wrought iron

Wrought iron, grey cast iron, low carbon steel

Grey cast iron, low carbon steel, wrought iron

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

Increases

Remain same

None of these

Decreases

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

Manganese

Silicon

Chromium

Carbon

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

40 : 60

30 : 70

70 : 30

50 : 50

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

(A) Silica bricks

(D) None of these

(C) Both (A) and (B)

(B) A mixture of tar and burnt dolomite bricks

39. Sulphur in steel

Acts as deoxidiser

Decreases tensile strength and hardness

Reduces the grain size

Lowers the toughness and transverse ductility

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

Physical change

Allotropic 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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