Engineering Materials Practice Set-2

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1. Grey cast iron

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

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

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

30 : 70

50 : 50

40 : 60

70 : 30

3. 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 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

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

4. 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%

5. The correct sequence for descending order of machinability is

Wrought iron, low carbon steel, grey cast iron

Wrought iron, grey cast iron, low carbon steel

Grey cast iron, low carbon steel, wrought iron

Low carbon steel, grey cast iron, wrought iron

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

Relieve stresses

Harden steel slightly

Improve machining characteristic

Soften material

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

Ferritic stainless steel

Martenistic stainless steel

Nickel steel

Austenitic stainless steel

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

None of these

Atomic packing factor

Coordination number

Space lattice

9. When medium carbon steel is heated to coarsening 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

10. The presence of hydrogen in steel causes

Embrittlement

Corrosion resistance

Reduced neutron absorption cross-section

Improved Weldability

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

Duralumin

Y-alloy

Hindalium

Magnalium

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

770°C

910°C

1050°C

Below recrystallization temperature

13. Sulphur in steel

Acts as deoxidiser

Reduces the grain size

Lowers the toughness and transverse ductility

Decreases tensile strength and hardness

14. Aluminium bronze contains

90% magnesium and 9% aluminium with some copper

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

10% aluminium and 90% copper

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

15. White 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

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

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

Point defect

Line defect

Volumetric defect

Plane defect

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

β-iron

γ-iron

α-iron

δ-iron

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

Metallurgical microscope

X-ray techniques

Naked eye

Optical microscope

19. Structural steel contains following principal alloying elements

Nickel, chromium and manganese

Lead, tin, aluminium

Tungsten, molybdenum and phosphorous

Zinc, sulphur, and chromium

20. Addition of manganese to aluminium results in

Improving machinability

Improvement of corrosion resistance

One of the best known age and precipitation hardening systems

Improvement of casting characteristics

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21. 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

22. Ductile 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

23. Free cutting steels

Require minimum cutting force

Is used where rapid machining is the prime requirement

Contain carbon in free from

Can be cut freely

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

Carbon

Silicon

Chromium

Manganese

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

Molecular change

Allotropic change

Physical change

Solidus change

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

Silicon

Manganese

Sulphur

Carbon

27. Admiralty gun metal contains

Alloy of tin, lead and cadmium

63 to 67% nickel and 30% copper

Iron scrap and zinc

88% copper, 10% tin and rest zinc

28. Duralumin contains

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

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

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

Covalent bond

None of these

Metallic bond

Ionic bond

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

1500°C to 1700°C

800°C to 1000°C

400° to 700°C

1200°C to 1300°C

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

Equal to

None of these

Less than

More than

32. Monel metal contains

63 to 67% nickel and 30% copper

88% copper and 10% tin and rest zinc

Malleable iron and zinc

Alloy of tin, lead and cadmium

33. 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

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

Decreases

None of these

Increases

Remain same

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

Sulphur

Phosphorus

Silicon

Manganese

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

High ductility

High resistance to rusting and corrosion

Ability of hold protective coating

Uniform strength in all directions

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

The grain size first increases and then decreases very rapidly

The grain size increases very rapidly

The average grain size is a minimum

There is no change in grain size

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

Phosphor bronze

Solder admiralty

Fusible metal

White metal

39. An eutectoid steel consists of

Pearlite and cementite

Wholly pearlite

Pearlite and ferrite

Wholly austenite

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

Crystalline material

Mesomorphous material

None of these

Amorphous material

Engineering Materials Practice Set-2

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