Engineering Materials Practice Set-2

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

(C) Both (A) and (B)

(A) Silica bricks

(B) A mixture of tar and burnt dolomite bricks

(D) None of these

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

Martenistic stainless steel

Ferritic stainless steel

Nickel steel

Austenitic stainless steel

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

Mesomorphous material

Amorphous material

Crystalline material

None of these

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

Space lattice

Coordination number

None of these

Atomic packing factor

5. Addition of manganese to aluminium results in

Improvement of corrosion resistance

One of the best known age and precipitation hardening systems

Improvement of casting characteristics

Improving machinability

6. 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 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

7. When medium carbon steel is heated to coarsening temperature

The grain size increases very rapidly

The grain size first increases and then decreases very rapidly

The average grain size is a minimum

There is no change in grain size

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

β-iron

δ-iron

γ-iron

α-iron

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

Point defect

Plane defect

Volumetric defect

Line defect

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

1200°C to 1300°C

800°C to 1000°C

400° to 700°C

1500°C to 1700°C

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

Carbon

Sulphur

Manganese

Silicon

12. Monel metal contains

Alloy of tin, lead and cadmium

63 to 67% nickel and 30% copper

88% copper and 10% tin and rest zinc

Malleable iron and zinc

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

910°C

1050°C

770°C

Below recrystallization temperature

14. 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

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

Manganese

Silicon

Carbon

Chromium

16. Structural steel contains following principal alloying elements

Zinc, sulphur, and chromium

Tungsten, molybdenum and phosphorous

Nickel, chromium and manganese

Lead, tin, aluminium

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

Hindalium

Magnalium

Duralumin

Y-alloy

18. 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

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

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

70 : 30

50 : 50

30 : 70

40 : 60

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

Phosphor bronze

White metal

Fusible metal

Solder admiralty

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

Ionic bond

Covalent bond

Metallic bond

None of these

22. Duralumin contains

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

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

23. Sulphur in steel

Reduces the grain size

Decreases tensile strength and hardness

Acts as deoxidiser

Lowers the toughness and transverse ductility

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

Equal to

None of these

More than

Less than

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

Harden steel slightly

Improve machining characteristic

Soften material

Relieve stresses

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

The grain size first increases and then decreases very rapidly

There is no change in grain size

The average grain size is a minimum

The grain size increases very rapidly

27. 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

28. The presence of hydrogen in steel causes

Embrittlement

Improved Weldability

Reduced neutron absorption cross-section

Corrosion resistance

29. 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

30. 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

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

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31. Pearlite consists of

13% cementite and 87% ferrite

6.67% carbon and 93.33% iron

13% ferrite and 87% cementite

13% carbon and 87% ferrite

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

Silicon

Sulphur

Manganese

Phosphorus

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

Uniform strength in all directions

High resistance to rusting and corrosion

Ability of hold protective coating

High ductility

34. The correct sequence for descending order of machinability is

Grey cast iron, low carbon steel, wrought iron

Wrought iron, grey cast iron, low carbon steel

Low carbon steel, grey cast iron, wrought iron

Wrought iron, low carbon steel, grey cast iron

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

Naked eye

Optical microscope

Metallurgical microscope

X-ray techniques

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

Decreases

None of these

Remain same

Increases

37. The percentage of carbon in pig iron varies from

2.5 to 4%

1.5 to 2.5%

0.1 to 1.2%

4 to 4.5%

38. 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

39. Free cutting steels

Contain carbon in free from

Is used where rapid machining is the prime requirement

Can be cut freely

Require minimum cutting force

40. An eutectoid steel consists of

Pearlite and ferrite

Pearlite and cementite

Wholly pearlite

Wholly austenite

Engineering Materials Practice Set-2

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