(SEM IV) THEORY EXAMINATION 2018-19 MEASUREMENT AND METROLOGY

MEASUREMENT AND METROLOGY – B.Tech (Semester IV), RME-401

This is a 3-hour, 70-mark theory examination designed to test a student’s understanding of precision measurement, metrological instruments, tolerances, fits, measurement errors, interferometry, transducers, surface texture measurement, and metrology applications in manufacturing.
The paper consists of three structured sections: short concepts, descriptive questions, and analytical/numerical/application-based questions.
 

SECTION A — Short Answer Questions (2 × 7 = 14 Marks)

This section contains 7 brief questions addressing basic metrology terms and concepts.

Topics include:

Precision vs Accuracy                                    Full interchangeability

Erratic error                                                   Piezoelectric transducer materials

Vernier scale least count calculation             Correction vs correction factor

Need for lasers in interferometry

These questions check definition-level understanding and basic technical concepts.
 

SECTION B — Descriptive Questions (7 × 3 = 21 Marks)

Attempt any 3 out of 5.
This section checks deeper understanding through explanations and diagrams.

Topics include:

Types of Coordinate Measuring Machines (CMM)

Types of measurement errors and their causes

Laser Doppler Velocimetry – working with diagram

AC Laser Interferometer – construction & working

Liquid-in-glass thermometer – construction & principle

These questions focus on measurement instruments, optical systems, and metrology devices.
 

SECTION C — Long Answer Questions (7 marks each)

Each question has choice (a or b) and requires analytical explanations, diagrams, or numerical solutions.

Q3 – Comparators & Optical Measurement Tools

Johansson Mikrokator: construction & working

Profile projector & checking coin profile (lion emblem)

Q4 – Surface Texture & Screw Thread Measurement

Primary vs Secondary texture + instrument for surface roughness measurement

Three-wire method: derivation and explanation

Q5 – Limits, Fits & Tolerances (Numerical Problems)

Determining hole/shaft limits using hole-basis and shaft-basis systems

Calculating tolerance, deviations & limits for 40 H8/f7

Q6 – System Characteristics & Transducers

Static & dynamic response characteristics

Elastic transducer for force measurement

Q7 – Mechanical & Measurement Systems

Bimetallic strip: construction & working

Elements of a generalized measurement system with example

This section evaluates advanced metrology skills, numerical accuracy, understanding of fits and tolerances, and detailed mechanical measurement principles.
 

OVERALL PURPOSE OF THE EXAM

This examination evaluates whether the student can:

Understand measurement principles & accuracy standards

Identify, classify & analyze different types of errors

Use optical and mechanical measurement devices

Apply principles of tolerances, fits, and fundamental deviations

Interpret laser-based and mechanical measurement systems

Solve practical manufacturing & inspection problems

Understand transducer behavior and dynamic response of systems

It covers both theoretical knowledge and practical engineering metrology applications, essential for manufacturing, quality control, and instrumentation engineering.