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

Nickel steel

Austenitic stainless steel

Ferritic stainless steel

Martenistic stainless steel

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

Less than

Equal to

None of these

More than

3. Monel metal contains

Alloy of tin, lead and cadmium

63 to 67% nickel and 30% copper

Malleable iron and zinc

88% copper and 10% tin and rest zinc

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

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

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

Remain same

Increases

Decreases

None of these

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

770°C

1050°C

Below recrystallization temperature

910°C

8. Pearlite consists of

13% cementite and 87% ferrite

13% ferrite and 87% cementite

13% carbon and 87% ferrite

6.67% carbon and 93.33% iron

9. Free cutting steels

Contain carbon in free from

Require minimum cutting force

Can be cut freely

Is used where rapid machining is the prime requirement

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

Duralumin

Y-alloy

Magnalium

Hindalium

Page 2 of 4

11. Admiralty gun metal contains

88% copper, 10% tin and rest zinc

Iron scrap and zinc

63 to 67% nickel and 30% copper

Alloy of tin, lead and cadmium

12. The correct sequence for descending order of machinability is

Low carbon steel, grey cast iron, wrought iron

Wrought iron, low carbon steel, grey cast iron

Grey cast iron, low carbon steel, wrought iron

Wrought iron, grey cast iron, low carbon steel

13. Duralumin contains

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

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

14. 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

15. The percentage of carbon in pig iron varies from

2.5 to 4%

1.5 to 2.5%

4 to 4.5%

0.1 to 1.2%

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

Silicon

Manganese

Carbon

Sulphur

17. An eutectoid steel consists of

Pearlite and ferrite

Wholly austenite

Wholly pearlite

Pearlite and cementite

18. Aluminium bronze contains

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

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

19. White 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 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

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. When medium carbon steel is heated to coarsening temperature

There is no change in grain size

The average grain size is a minimum

The grain size first increases and then decreases very rapidly

The grain size increases very rapidly

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

Ionic bond

Covalent bond

Metallic bond

None of these

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

Manganese

Silicon

Sulphur

Phosphorus

24. Structural steel contains following principal alloying elements

Tungsten, molybdenum and phosphorous

Nickel, chromium and manganese

Lead, tin, aluminium

Zinc, sulphur, and chromium

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

70 : 30

50 : 50

40 : 60

30 : 70

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

Allotropic change

Molecular change

Physical change

Solidus change

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

Volumetric defect

Line defect

Point defect

Plane defect

28. Sulphur in steel

Acts as deoxidiser

Lowers the toughness and transverse ductility

Decreases tensile strength and hardness

Reduces the grain size

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

Solder admiralty

Phosphor bronze

White metal

Fusible metal

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

γ-iron

β-iron

α-iron

δ-iron

Page 4 of 4

31. The presence of hydrogen in steel causes

Improved Weldability

Embrittlement

Reduced neutron absorption cross-section

Corrosion resistance

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

Crystalline material

None of these

Amorphous material

Mesomorphous material

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

Coordination number

None of these

Atomic packing factor

Space lattice

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

Metallurgical microscope

X-ray techniques

Optical microscope

Naked eye

35. 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

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

Soften material

Improve machining characteristic

Relieve stresses

Harden steel slightly

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

(C) Both (A) and (B)

(A) Silica bricks

(D) None of these

(B) A mixture of tar and burnt dolomite bricks

38. Grey cast iron

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

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

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

Uniform strength in all directions

High resistance to rusting and corrosion

High ductility

Ability of hold protective coating

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

Carbon

Silicon

Manganese

Chromium

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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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