(SEM III) THEORY EXAMINATION 2022-23 MATERIALS ENGINEERING

This question paper is designed to test the fundamental understanding, analytical skills, and application-based knowledge of students in the subject Engineering Materials. It covers a wide range of topics from material properties, crystal structures, phase diagrams, heat treatment processes, mechanical behavior, and modern engineering materials.

Section A – Short Answer Questions (20 Marks)

This section contains 10 concise questions, each carrying 2 marks. The questions are conceptual and check the student’s basic understanding of:

Unit cell and crystal structure terms

Mechanical properties such as malleability and fatigue

Material classification (alloy vs. ore)

Heat treatment, its need and purpose

Phase diagrams and degree of freedom

Carbon percentage in tool steels

Difference between microstructures (Martensite & Cementite)

This section emphasizes clarity of fundamental concepts.

Section B – Descriptive / Analytical Questions (30 Marks)

Students must attempt any 3 out of 5 questions, each carrying 10 marks.
This section tests in-depth understanding and the ability to explain with sketches and examples. Topics include:

Detailed explanation of crystal systems

Mechanisms of ductile and brittle failure

The complete Iron–Carbon equilibrium diagram

Annealing & normalizing processes and their impact on properties

Properties and engineering applications of Stainless steel & Tool steel

The questions require diagrams, reasoning, and deep conceptual clarity.

Section C – Long Answer / Application-Based Questions (50 Marks)

This section contains 5 questions, each with two alternatives, from which students must attempt one per question. Every question carries 10 marks.

It evaluates analytical ability, reasoning, and real-world engineering application.
The topics include:

Q3 – Imperfections & Mechanical Behavior

Types of line defects (dislocations) with diagrams

Load-deformation behavior of brittle materials

Q4 – Failure Theories / Fatigue

Static failure theories (e.g., Maximum principal stress theory)

S–N curve behavior for ferrous and non-ferrous alloys

Q5 – Solid Solutions / Microstructure

Types of solid solutions (substitutional & interstitial)

Micro-constituents of eutectoid steel

Q6 – Heat Treatment Processes

Tempering and its types

Case hardening and its methods (carburizing, nitriding, etc.)

Q7 – Advanced Engineering Materials

Nickel-based superalloys

Other advanced engineering materials and their properties

This section requires detailed explanations supported with diagrams, formulas, and engineering relevance.

Overall Description

This paper comprehensively assesses a student’s knowledge of engineering materials, including:

Crystallography

Mechanical properties

Phase diagrams

Heat treatment

Failure mechanisms

Advanced materials

Practical engineering applications

It is structured to test basic understanding, analytical depth, diagrammatic skills, and applied problem-solving abilities.