Engineering Materials Practice Set-2

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

None of these

More than

Less than

Equal to

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

Harden steel slightly

Soften material

Improve machining characteristic

Relieve stresses

3. 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 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

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

5. Addition of manganese to aluminium results in

Improving machinability

Improvement of casting characteristics

Improvement of corrosion resistance

One of the best known age and precipitation hardening systems

6. 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

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

Crystalline material

Mesomorphous material

None of these

Amorphous material

8. Admiralty gun metal contains

Alloy of tin, lead and cadmium

Iron scrap and zinc

88% copper, 10% tin and rest zinc

63 to 67% nickel and 30% copper

9. Structural steel contains following principal alloying elements

Lead, tin, aluminium

Zinc, sulphur, and chromium

Nickel, chromium and manganese

Tungsten, molybdenum and phosphorous

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

Volumetric defect

Plane defect

Line defect

Point defect

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11. Grey 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 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

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

Manganese

Carbon

Sulphur

Silicon

13. Duralumin contains

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

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

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

None of these

Covalent bond

Ionic bond

Metallic bond

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

δ-iron

γ-iron

α-iron

β-iron

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

800°C to 1000°C

1500°C to 1700°C

400° to 700°C

1200°C to 1300°C

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

X-ray techniques

Naked eye

Optical microscope

Metallurgical microscope

18. Sulphur in steel

Lowers the toughness and transverse ductility

Acts as deoxidiser

Decreases tensile strength and hardness

Reduces the grain size

19. 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 increases very rapidly

The grain size first increases and then decreases very rapidly

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

Decreases

None of these

Increases

Remain same

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21. Aluminium bronze contains

90% magnesium and 9% aluminium with some copper

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

10% aluminium and 90% copper

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

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

70 : 30

30 : 70

50 : 50

40 : 60

23. An eutectoid steel consists of

Pearlite and cementite

Pearlite and ferrite

Wholly austenite

Wholly pearlite

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

Solidus change

Physical change

Allotropic change

Molecular change

25. 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%

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

Solder admiralty

Fusible metal

White metal

Phosphor bronze

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

The grain size increases very rapidly

The grain size first increases and then decreases very rapidly

There is no change in grain size

The average grain size is a minimum

28. Pearlite consists of

13% carbon and 87% ferrite

13% ferrite and 87% cementite

13% cementite and 87% ferrite

6.67% carbon and 93.33% iron

29. Free cutting steels

Can be cut freely

Is used where rapid machining is the prime requirement

Require minimum cutting force

Contain carbon in free from

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

1050°C

910°C

Below recrystallization temperature

770°C

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

Nickel steel

Ferritic stainless steel

Martenistic stainless steel

Austenitic stainless steel

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

Sulphur

Manganese

Silicon

Phosphorus

33. 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 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

34. 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

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

Hindalium

Y-alloy

Magnalium

Duralumin

36. The presence of hydrogen in steel causes

Improved Weldability

Embrittlement

Corrosion resistance

Reduced neutron absorption cross-section

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

High ductility

Ability of hold protective coating

Uniform strength in all directions

High resistance to rusting and corrosion

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

(A) Silica bricks

(B) A mixture of tar and burnt dolomite bricks

(D) None of these

(C) Both (A) and (B)

39. Monel metal contains

Malleable iron and zinc

Alloy of tin, lead and cadmium

63 to 67% nickel and 30% copper

88% copper and 10% tin and rest zinc

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

Carbon

Chromium

Manganese

Silicon

Engineering Materials Practice Set-2

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