Engineering Materials Practice Set-2

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1. Structural steel contains following principal alloying elements

Zinc, sulphur, and chromium

Nickel, chromium and manganese

Tungsten, molybdenum and phosphorous

Lead, tin, aluminium

2. 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

3. 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

There is no change in grain size

The average grain size is a minimum

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

Ferritic stainless steel

Nickel steel

Austenitic stainless steel

Martenistic stainless steel

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

Naked eye

Optical microscope

Metallurgical microscope

X-ray techniques

6. Grey cast iron

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

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 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

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

Silicon

Carbon

Manganese

Chromium

8. When medium carbon steel is heated to coarsening temperature

The average grain size is a minimum

The grain size first increases and then decreases very rapidly

The grain size increases very rapidly

There is no change in grain size

9. 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

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

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

1050°C

Below recrystallization temperature

910°C

770°C

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

Coordination number

Space lattice

None of these

Atomic packing factor

12. Monel metal contains

88% copper and 10% tin and rest zinc

Malleable iron and zinc

Alloy of tin, lead and cadmium

63 to 67% nickel and 30% copper

13. Sulphur in steel

Acts as deoxidiser

Reduces the grain size

Decreases tensile strength and hardness

Lowers the toughness and transverse ductility

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

30 : 70

70 : 30

40 : 60

50 : 50

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

Silicon

Manganese

Carbon

Sulphur

16. The presence of hydrogen in steel causes

Reduced neutron absorption cross-section

Corrosion resistance

Embrittlement

Improved Weldability

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

Phosphorus

Sulphur

Silicon

Manganese

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

None of these

Increases

Remain same

Decreases

19. 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 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

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

None of these

Ionic bond

Metallic bond

Covalent bond

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

High resistance to rusting and corrosion

Ability of hold protective coating

Uniform strength in all directions

High ductility

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

White metal

Phosphor bronze

Fusible metal

Solder admiralty

23. 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

Wrought iron, grey cast iron, low carbon steel

Grey cast iron, low carbon steel, wrought iron

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

Soften material

Relieve stresses

Harden steel slightly

Improve machining characteristic

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

None of these

Less than

More than

Equal to

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

Allotropic change

Solidus change

Physical change

Molecular change

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

1500°C to 1700°C

1200°C to 1300°C

400° to 700°C

800°C to 1000°C

28. 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%

29. Free cutting steels

Is used where rapid machining is the prime requirement

Contain carbon in free from

Can be cut freely

Require minimum cutting force

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

Magnalium

Duralumin

Hindalium

Y-alloy

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

Plane defect

Point defect

Volumetric defect

Line defect

32. 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

33. Admiralty gun metal contains

Iron scrap and zinc

88% copper, 10% tin and rest zinc

63 to 67% nickel and 30% copper

Alloy of tin, lead and cadmium

34. 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 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

35. An eutectoid steel consists of

Wholly austenite

Wholly pearlite

Pearlite and cementite

Pearlite and ferrite

36. 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

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

δ-iron

γ-iron

α-iron

β-iron

38. 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 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

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

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

(B) A mixture of tar and burnt dolomite bricks

(C) Both (A) and (B)

(D) None of these

(A) Silica bricks

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

Amorphous material

Crystalline material

None of these

Mesomorphous material

Engineering Materials Practice Set-2

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