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JNTU B.Tech II METALLURGY AND MATERIALS SCIENCE Previous Question Paper (November/December - 2018 - R15)

B.Tech | II | I | R15 | November/December - 2018

Answer PaperPaper Code: 123AQMaximum Marks: 75Time: 3 Hours

Note: This question paper contains two parts A and B. Part A is compulsory which carries 25 marks. Answer all questions in Part A. Part B consists of 5 Units. Answer any one full question from each unit.

PART - A

Answer all questions.

25 marks

Explain why grain boundaries look darker under the microscope, while the grains look brighter.

2 marks

Answer

Grain boundaries appear darker under the microscope because they are regions of higher energy and disorder compared to the ordered crystalline structure within the grains. During etching, these boundaries are preferentially attacked and removed, creating small grooves or pits. When viewed under reflected light, these grooves scatter light away from the objective lens, making them appear dark. In contrast, the grains, being more resistant to etching, reflect light directly towards the objective lens, appearing brighter.

Draw the plane (100).

3 marks

Answer

The plane (100) is a crystallographic plane that is perpendicular to the x-axis in a cubic crystal system. It passes through the origin and intersects the x-axis at one unit length, while being parallel to the y and z axes. Visually, in a cubic unit cell, this plane would cut through the front face, the top face, and the right face, forming a square parallel to the yz plane.

What is lever rule?

2 marks

Answer

Differentiate between tool steel and Die steel.

3 marks

Answer

Differentiate between annealing and normalizing.

2 marks

Answer

Distinguish between peritectoid and eutectoid reactions.

3 marks

Answer

Write the composition of cartridge brass.

2 marks

Answer

Copper and Al are highly ductile compare to Iron. Why?

3 marks

Answer

Differentiate between crystallize ceramics and cermet’s.

2 marks

Answer

Define ceramic and composite.

3 marks

Answer

PART - B

210 marks

Write about crystallization of meals.

5 marks

Answer

What is the role of grain size on the properties of materials?

5 marks

Answer

310 marks

State Hume-Rothery’s rules for the formation of substitutional solid solution.

5 marks

Answer

How do you determine the Miller Indices? Explain it with suitable example.

5 marks

Answer

410 marks

What is phase rule? Give suitable examples.

5 marks

Answer

Draw and explain Isomorphous system.

5 marks

Answer

Write short notes on Transformations in the solid state.

10 marks

Answer

Draw the Fe-Fe3C Diagram and label all the points, lines, temperatures and reactions.

10 marks

Answer

Draw neatly the TTT curves for Eutectoid steels.

10 marks

Answer

810 marks

What is cast Iron and Classify it and write the properties.

5 marks

Answer

Write notes on Al-Cu alloys.

5 marks

Answer

910 marks

Write about structure, properties, heat treatment cycles and Applications of Titanium and its alloys.

5 marks

Answer

Explain why extensive coring occurs in bronzes compared to brasses.

5 marks

Answer

Enumerate the characteristics, properties and applications of cermet’s and Glasses.

10 marks

Answer

Write short notes on:

10 marks

Metal Matrix composites.

5 marks

Answer

Fiber reinforced materials.

5 marks

JNTU B.Tech II METALLURGY AND MATERIALS SCIENCE Previous Question Paper (November/December - 2018 - R15)

PART - A

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PART - B

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