10AU32B/10AU42B IA MECHANICAL MEASUREMENTS AND METROLOGY syllabus Visvesvaraya Technological University

MECHANICAL MEASUREMENTS AND METROLOGY
Sub Code : 10AU32B/10AU42B IA Marks : 25
Hrs/week : 04 Exam Hours : 03
Total Lecture Hrs : 52 Exam Marks: 100
PART- A
UNIT-1: Standards of measurement:
Definition and Objectives of metrology, Standards of length-International prototype meter, Imperial
standard yard, Wave length standard, subdivision of standards, line and end standard, calibration of end
bars (Numerical), Slip gauges, Wringing phenomena, Indian Standards (M-81, M-12), Numerical
problems on building of slip gauges.
06 Hours
UNIT-2: System of Limits, Fits, Tolerance and Gauging:
Definition of tolerance, Specification in assembly, Principle of interchangeability and selective assembly
limits of size, Indian standards, concept of limits of size and tolerances, compound tolerances,
accumulation of tolerances, definition of fits, types of fits and their designation (IS919-1963), geometrical
tolerance, positional-tolerances, hole basis system, shaft basis system, classification of gauges, brief concept
of design of gauges (Taylor's principles), Wear allowance on gauges, Types of gauges-plain plug gauge,
ring gauge, snap gauge, limit gauge and gauge materials.
07 Hours
UNIT-3: Comparators and Angular measurement:
Introduction to comparators, characteristics, classification of comparators, mechanical comparators-
Johnson Mikrokator, sigma comparators, dial indicator, optical comparators-principles, Zeiss ultra
optimeter, electric and electronic comparators-principles, LVDT, pneumatic comparators, back pressure
gauges, solex comparators. Angular measurements, bevel protractor, sine principle and use of sine bars, sine
centre, use of angle gauges (numericals on building of angles), clinometers.
07 Hours
UNIT-4: Interferometer and screw thread, gear measurement:
Interferometer, interferemetry, autocollimator. Optical flats. Terminology of screw threads,
measurementof major diameter, minor diameter, pitch, angle and effective diameter of screw threadsby
2-wire and 3-wire methods, best size wire. Tool maker's microscope, gear.to., terminology, use
of gear tooth vernier caliper and micrometer.
06 Hours
PART-B
UNIT-5: Measurements and measurement systems:
Definition, significance of measurement, generalized measurement system, definitions and concept of
accuracy, precision, calibration, threshold, sensitivity, hysterisis, repeatability, linearity, loading effect,
system response-times delay. Errors in measurement, classification of errors. Transducers, transfer
efficiency, primary and secondary transducers, electrical, mechanical, electronic transducers,
advantages of each type transducers.
07 Hours
5
UNIT-6 Intermediate: modifying and terminating devices:
Mechanical systems, inherent problems, electrical intermediate modifying devices, input circuitry,
ballast circuit, electronic amplifiers and telemetry. Terminating devices, mechanical, cathode ray
oscilloscope, oscillographs, X-Y plotters.
06 Hours
UNIT-7:Measurement of force, torque and pressure:
Principle, analytical balance,platform balance, proving ring. Torque measurement, Prony brake,
hydraulicdynamometer. Pressure measurements, principle, use of elastic merijbers, Bridgemangauge,
Mcloed gauge, Pirani gauge.
06 Hours
I
UNIT-8:Temperature and strain measurement:
Resistance thermometers, thermocouple, law of thermo couple, materials used for construction,
pyrometer, optical pyrometer. Strain measurements, strain gauge, preparation and mounting of strain gauges,
gauge factor, methods of strain measurement.
07 Hours
TEXT BOOKS:
1. Mechanical Measurements, Beckwith Marangoni and Lienhard, Pearson
Education, 6th Ed., 2006.
2. Engineering Metrology, R.K. Jain, Khanna Publishers, 1994.
REFERENCE BOOKS:
1. Engineering Metrology, I.C. Gupta, Dhapat Rai Publications,Delhi.
2. Mechanical Measurements, R.K. Jain
3. Industrial Instrumentation, Alsutko, Jerry. D. Faulk, Thompson Asia Pvt. Ltd.2002.
4. Measurement Systems Applications and Design, Ernest O. Doblin, McGraw
Hill Book Co.