Engineering Materials Practice Set-2

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1. The presence of hydrogen in steel causes

Improved Weldability

Embrittlement

Corrosion resistance

Reduced neutron absorption cross-section

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

Equal to

More than

None of these

Less than

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

Naked eye

X-ray techniques

Optical microscope

Metallurgical microscope

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

Silicon

Sulphur

Manganese

Carbon

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

1050°C

Below recrystallization temperature

910°C

770°C

6. 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

7. Admiralty gun metal contains

88% copper, 10% tin and rest zinc

Iron scrap and zinc

63 to 67% nickel and 30% copper

Alloy of tin, lead and cadmium

8. The percentage of carbon in pig iron varies from

4 to 4.5%

0.1 to 1.2%

2.5 to 4%

1.5 to 2.5%

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. Structural steel contains following principal alloying elements

Nickel, chromium and manganese

Lead, tin, aluminium

Zinc, sulphur, and chromium

Tungsten, molybdenum and phosphorous

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

30 : 70

40 : 60

50 : 50

70 : 30

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

Duralumin

Hindalium

Magnalium

Y-alloy

13. 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

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

Silicon

Chromium

Carbon

Manganese

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

Metallic bond

Covalent bond

None of these

Ionic bond

16. The correct sequence for descending order of machinability is

Wrought iron, low carbon steel, grey cast iron

Grey cast iron, low carbon steel, wrought iron

Wrought iron, grey cast iron, low carbon steel

Low carbon steel, grey cast iron, wrought iron

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

Harden steel slightly

Soften material

Improve machining characteristic

Relieve stresses

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

Martenistic stainless steel

Austenitic stainless steel

Ferritic stainless steel

Nickel steel

19. Sulphur in steel

Reduces the grain size

Decreases tensile strength and hardness

Lowers the toughness and transverse ductility

Acts as deoxidiser

20. 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

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

Atomic packing factor

Space lattice

None of these

Coordination number

22. 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

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

γ-iron

α-iron

δ-iron

β-iron

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

Plane defect

Line defect

Volumetric defect

Point defect

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

1500°C to 1700°C

1200°C to 1300°C

800°C to 1000°C

400° to 700°C

26. An eutectoid steel consists of

Pearlite and ferrite

Pearlite and cementite

Wholly austenite

Wholly pearlite

27. Addition of manganese to aluminium results in

Improving machinability

Improvement of corrosion resistance

Improvement of casting characteristics

One of the best known age and precipitation hardening systems

28. 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 produced by annealing process. I is soft, tough and easily machined metal

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

29. Malleable 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 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

30. Monel metal contains

Malleable iron and zinc

88% copper and 10% tin and rest zinc

63 to 67% nickel and 30% copper

Alloy of tin, lead and cadmium

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

Ability of hold protective coating

High ductility

Uniform strength in all directions

High resistance to rusting and corrosion

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

Mesomorphous material

None of these

Amorphous material

Crystalline material

33. Free cutting steels

Is used where rapid machining is the prime requirement

Can be cut freely

Contain carbon in free from

Require minimum cutting force

34. 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

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

Phosphor bronze

Solder admiralty

White metal

Fusible metal

36. 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

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

Silicon

Phosphorus

Manganese

Sulphur

38. Aluminium bronze contains

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

90% magnesium and 9% aluminium with some copper

39. Pearlite consists of

13% ferrite and 87% cementite

13% cementite and 87% ferrite

6.67% carbon and 93.33% iron

13% carbon and 87% ferrite

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

Remain same

Decreases

Increases

None of these

Engineering Materials Practice Set-2

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