(SEM III) THEORY EXAMINATION 2021-22 MATERIAL SCIENCE

This is a B.Tech-level Materials Science / Materials Engineering question paper designed to test a student's understanding of material properties, phase diagrams, heat treatment, composites, nanomaterials, mechanical behavior, and magnetic/dielectric phenomena.
The paper is divided into three sections (A, B, C), covering conceptual theory, descriptive explanations, and diagram-based long-answer questions.

SECTION A – Short Concept-Based Questions (20 Marks)

This section contains 10 brief questions (2 marks each) that test fundamental concepts in materials science:

Solid solution strengthening

Concept of magnetism

Carbon percentage in steel vs. cast iron

Purpose of tempering

Properties & applications of stainless steel

Meaning of superconductivity

Difference between annealing and normalizing

Definition of creep with example

Matrix & reinforcement in composites

Objectives of heat treatment

These questions evaluate basic definitions and recall-level understanding of material behavior.

SECTION B – Descriptive & Analytical Questions (30 Marks)

Students must attempt any three out of five questions (each 10 marks). These require deeper explanation and technical knowledge:

Hume–Rothery rules for solid-solution formation

Creep testing & its engineering importance

Dielectric materials & their applications

TTT diagram for eutectoid steel and transformation behavior

Stress–strain curve of metals with full explanation of all regions

This section assesses the ability to describe mechanisms, interpret diagrams, and explain material behavior under various conditions.

SECTION C – Long Answer / Application-Oriented Questions (50 Marks)

Students must attempt one part from each question. These are long, detailed, and diagram-based.

Q3 – Iron–Carbon Diagram / Hardness Testing

Iron–carbon equilibrium diagram with phases, temperatures, compositions, and microstructures (pearlite, eutectoid steel)
OR

Differences between Rockwell, Brinell, and Vickers hardness tests

Q4 – Magnetic Materials / Solid Solutions

Ferromagnetism, diamagnetism, and shape memory alloys
OR

Types of solid solutions and their explanation

Q5 – Composites / Diffusion

Types of composite materials and their classification
OR

Diffusion and Fick’s laws with explanation

Q6 – Polarization / Hysteresis

Meaning of polarization & frequency effects
OR

Hysteresis loop with detailed explanation

Q7 – Nanomaterials / Carbon Nanotubes

Definition & applications of nanomaterials
OR

Types, properties, and applications of carbon nanotubes

This section evaluates high-level analytical skills, diagram interpretation, and the ability to explain mechanisms related to modern materials.

OVERALL SUMMARY

This question paper comprehensively covers:

Material strengthening mechanisms

Magnetic, dielectric, and superconducting properties

Heat treatment processes

Phase diagrams (especially Fe–C system)

Mechanical behavior (creep, stress–strain)

Composite materials

Diffusion & Fick’s laws

Polarization & hysteresis

Nanomaterials and carbon nanotubes

It tests both theoretical understanding and practical engineering relevance, giving students a complete evaluation of Materials Science concepts.