Engineering Materials Practice Set-2

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

Solidus change

Molecular change

Physical change

Allotropic change

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

(D) None of these

(B) A mixture of tar and burnt dolomite bricks

(C) Both (A) and (B)

(A) Silica bricks

3. An eutectoid steel consists of

Pearlite and cementite

Wholly pearlite

Pearlite and ferrite

Wholly austenite

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

50 : 50

30 : 70

70 : 30

40 : 60

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

Duralumin

Magnalium

Y-alloy

Hindalium

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

More than

None of these

Equal to

Less than

7. Structural steel contains following principal alloying elements

Zinc, sulphur, and chromium

Tungsten, molybdenum and phosphorous

Nickel, chromium and manganese

Lead, tin, aluminium

8. When medium carbon steel is heated to coarsening temperature

There is no change in grain size

The grain size increases very rapidly

The grain size first increases and then decreases very rapidly

The average grain size is a minimum

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

Silicon

Carbon

Chromium

Manganese

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

None of these

Mesomorphous material

Amorphous material

Crystalline material

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11. Ductile 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 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

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

12. Pearlite consists of

6.67% carbon and 93.33% iron

13% ferrite and 87% cementite

13% cementite and 87% ferrite

13% carbon and 87% ferrite

13. White cast iron

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

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

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

910°C

770°C

1050°C

Below recrystallization temperature

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

Volumetric defect

Line defect

Plane defect

Point defect

16. Sulphur in steel

Acts as deoxidiser

Decreases tensile strength and hardness

Reduces the grain size

Lowers the toughness and transverse ductility

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

Improve machining characteristic

Soften material

Relieve stresses

Harden steel slightly

18. 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%

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

Martenistic stainless steel

Nickel steel

Austenitic stainless steel

Ferritic stainless steel

20. Admiralty gun metal contains

63 to 67% nickel and 30% copper

88% copper, 10% tin and rest zinc

Iron scrap and zinc

Alloy of tin, lead and cadmium

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21. The correct sequence for descending order of machinability is

Wrought iron, grey cast iron, low carbon steel

Low carbon steel, grey cast iron, wrought iron

Wrought iron, low carbon steel, grey cast iron

Grey cast iron, low carbon steel, wrought iron

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

23. Monel metal contains

63 to 67% nickel and 30% copper

Malleable iron and zinc

88% copper and 10% tin and rest zinc

Alloy of tin, lead and cadmium

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

Solder admiralty

Fusible metal

Phosphor bronze

White metal

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

β-iron

γ-iron

δ-iron

α-iron

26. Free cutting steels

Is used where rapid machining is the prime requirement

Require minimum cutting force

Contain carbon in free from

Can be cut freely

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

X-ray techniques

Naked eye

Metallurgical microscope

Optical microscope

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

Manganese

Silicon

Phosphorus

Sulphur

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

The grain size increases very rapidly

The average grain size is a minimum

There is no change in grain size

The grain size first increases and then decreases very rapidly

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

Sulphur

Carbon

Manganese

Silicon

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

Decreases

Remain same

None of these

Increases

32. 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

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

Space lattice

Atomic packing factor

Coordination number

None of these

34. Aluminium bronze contains

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

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

90% magnesium and 9% aluminium with some copper

10% aluminium and 90% copper

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

High ductility

Uniform strength in all directions

High resistance to rusting and corrosion

Ability of hold protective coating

36. 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

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

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

37. The presence of hydrogen in steel causes

Embrittlement

Corrosion resistance

Reduced neutron absorption cross-section

Improved Weldability

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

Metallic bond

None of these

Ionic bond

Covalent bond

39. 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

Is also known as chilled cast iron 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

40. Addition of manganese to aluminium results in

Improvement of casting characteristics

One of the best known age and precipitation hardening systems

Improvement of corrosion resistance

Improving machinability

Engineering Materials Practice Set-2

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