Engineering Materials Practice Set-2

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1. 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

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

None of these

Mesomorphous material

Amorphous material

Crystalline material

3. Duralumin contains

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

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

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

Plane defect

Volumetric defect

Point defect

Line defect

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

800°C to 1000°C

1500°C to 1700°C

1200°C to 1300°C

400° to 700°C

6. Monel metal contains

Malleable iron and zinc

63 to 67% nickel and 30% copper

88% copper and 10% tin and rest zinc

Alloy of tin, lead and cadmium

7. 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%

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

Carbon

Manganese

Chromium

Silicon

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

None of these

Remain same

Decreases

Increases

10. The presence of hydrogen in steel causes

Improved Weldability

Reduced neutron absorption cross-section

Corrosion resistance

Embrittlement

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

Ferritic stainless steel

Martenistic stainless steel

Austenitic stainless steel

Nickel steel

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

30 : 70

50 : 50

40 : 60

70 : 30

13. 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

Low carbon steel, grey cast iron, wrought iron

Grey cast iron, low carbon steel, wrought iron

14. Free cutting steels

Require minimum cutting force

Contain carbon in free from

Can be cut freely

Is used where rapid machining is the prime requirement

15. An eutectoid steel consists of

Pearlite and cementite

Pearlite and ferrite

Wholly austenite

Wholly pearlite

16. 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

17. 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

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

Improve machining characteristic

Relieve stresses

Harden steel slightly

Soften material

19. 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

20. Addition of manganese to aluminium results in

Improvement of casting characteristics

Improvement of corrosion resistance

One of the best known age and precipitation hardening systems

Improving machinability

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21. Grey cast iron

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

Is produced by annealing process. I 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

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

δ-iron

γ-iron

β-iron

α-iron

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

White metal

Phosphor bronze

Solder admiralty

Fusible metal

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

High resistance to rusting and corrosion

Ability of hold protective coating

High ductility

Uniform strength in all directions

25. Sulphur in steel

Lowers the toughness and transverse ductility

Reduces the grain size

Decreases tensile strength and hardness

Acts as deoxidiser

26. When medium carbon steel is heated to coarsening temperature

The grain size increases very rapidly

There is no change in grain size

The grain size first increases and then decreases very rapidly

The average grain size is a minimum

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

Metallic bond

Ionic bond

None of these

Covalent bond

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

Sulphur

Manganese

Silicon

Carbon

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

Manganese

Phosphorus

Silicon

Sulphur

30. Pearlite consists of

13% carbon and 87% ferrite

6.67% carbon and 93.33% iron

13% ferrite and 87% cementite

13% cementite and 87% ferrite

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

Physical change

Molecular change

Solidus change

Allotropic change

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

770°C

1050°C

910°C

Below recrystallization temperature

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

Magnalium

Hindalium

Y-alloy

Duralumin

34. 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 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

Contains 1.7 to 3.5% carbon in Free State and is obtained by the slow cooling of molten cast iron

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

X-ray techniques

Naked eye

Metallurgical microscope

Optical microscope

36. Admiralty gun metal contains

Iron scrap and zinc

Alloy of tin, lead and cadmium

63 to 67% nickel and 30% copper

88% copper, 10% tin and rest zinc

37. Structural steel contains following principal alloying elements

Nickel, chromium and manganese

Lead, tin, aluminium

Zinc, sulphur, and chromium

Tungsten, molybdenum and phosphorous

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

None of these

More than

Less than

Equal to

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

(C) Both (A) and (B)

(D) None of these

(B) A mixture of tar and burnt dolomite bricks

(A) Silica bricks

40. Aluminium bronze contains

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

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

90% magnesium and 9% aluminium with some copper

10% aluminium and 90% copper

Engineering Materials Practice Set-2

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