(SEM III) THEORY EXAMINATION 2020-21 MATERIALS ENGINEERING

This document is the B.Tech Semester III Theory Examination Question Paper for Materials Engineering (KME303) under AKTU (Dr. A.P.J. Abdul Kalam Technical University) for the academic session 2020–2021. The exam carries 100 marks and the duration is 3 hours.

The uploaded question paper contains exactly three sections:

SECTION A — Short Questions (10 × 2 = 20 Marks)

Section A includes ten short-answer questions, each carrying 2 marks. These questions test the basic fundamentals of materials engineering. Topics include:

Strain hardening

Frenkel and Schottky defects

Theoretical density of copper

Critical resolved shear stress

Classification of carbon steels

Solubility of carbon in austenite vs. ferrite

Hardenability

Lever rule

Cold vs. hot working

Classification of copper alloys

This section checks whether the student understands the core definitions and basic concepts of materials science.

SECTION B — Long Descriptive Questions (Any 3 × 10 = 30 Marks)

This section contains five detailed questions, from which students must attempt any three.
The questions require explanations, diagrams, and conceptual clarity.
Topics include:

Ductile vs. brittle fracture and effect of dislocations

Pb–Sn phase diagram and eutectic reaction explanation

Phase diagram construction for insoluble metals and alloy solidification

Heat treatment of plain carbon steels (annealing, normalizing, etc.)

Brass, Bronze, Muntz metal, Nickel alloy steels, and Maraging steels

This section evaluates deeper understanding and application of materials engineering principles.

SECTION C — Numerical / Analytical / Diagram-Based Questions (Any 5 × 10 = 50 Marks)

Section C contains five 10-mark questions, and students must attempt any five.
This is the largest section of the paper and includes:

Screw dislocations, Burgers vector, and slip mechanism

Griffith theory of brittle fracture and difference between ductile & brittle failure

Binary eutectic phase diagram: drawing, composition calculation, microstructure

TTT diagram of steels with explanation of transformation zones

Production of wrought iron in puddling furnace and effect of alloying elements

This section includes derivations, microstructure explanations, diagrams, and analytical reasoning.

Overall Summary

This Materials Engineering exam paper evaluates a student's knowledge in:

Crystal defects & strengthening mechanisms

Phase diagrams (Pb–Sn, eutectic diagrams)

Iron–Carbon system overview

Heat treatment processes

Mechanical behavior of materials

Failure theories (ductile/brittle fracture)

Alloy classification and processing

The paper is structured to test:

Basic understanding (Section A)

Deep theoretical knowledge (Section B)

Analytical, diagram-based, and descriptive understanding (Section C)

The uploaded question paper contains only these 3 sections, and the description above matches the document exactly.