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, comparison, transfer from line standard to end standard, calibration of end bars (Numerical), Slip gauges, Wringing phenomena, Indian Standards (M-81, M-112), Numerical problems on building of slip gauges.
System of limits, Fits, Tolerances and gauging:
Definition of tolerance, Specification in assembly, Principle of inter changeability 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 (IS 919 -1963), geometrical tolerance, positional - tolerances, hole basis system, shaft basis of 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.
Comparators and Angular measurement:
Introduction to Comparator, Characteristics, classification of comparators, mechanical comparators - Sigma Comparators, dial indicator, Optical Comparators -principles, Zeiss ultra optimeter, Electric and Electronic Comparators -principles, Pneumatic Comparators, back pressure gauges, Solex Comparators. Angular measurements, Bevel Protractor, Sine Principle and. use of Sine bars, Sine center, use of angle gauges, Clinometers,
Screw thread gear measurement:
Terminology of screw threads, measurement of major diameter, minor diameter pitch, angle and effective diameter of screw threads by 2-wire and 3-wire methods, Best size wire. Gear tooth vernier.
Measurements and Measurement systems:
Definition, Significance of measurement, generalized measurement system, definitions and concept of accuracy, precision, calibration, threshold, sensitivity, hysteresis, repeatability, linearity, loading effect, system response-times delay. Errors in Measurements, Classification of Errors. Transducers, Transfer efficiency, Primary and Secondary transducers, electrical, Mechanical, electronic transducers, advantages of each type transducers.
Measurement of quantities:
Principle, analytical balance, platform balance, proving ring, Torque measurement, Prony brake, hydraulic dynamometer. Pressure Measurements, Principle, use of elastic members, Bridgeman gauge, Mcloed gauge, Pirani Gauge.
Temperature and strain measurement:
Resistance thermometers, thermocouple, law of thermocouple, materials used for construction, pyrometer, Optical Pyrometer. Strain Measurements, Strain gauge, preparation and mounting of strain gauges, gauge factor, methods of strain measurement.
Course Outcomes:
At the end of the course the student will be able to:
1. CO1: Apply the standards of measurement, system of limits, fits, tolerances and gauging.
2. CO2: Identify and use appropriate measuring instruments.
3. CO3 : Acquire the knowledge on measurement and measurement systems
Question paper pattern:
Textbook/s
1 Mechanical Measurements Beckwith Marangoni and Lienhard, John H. Lienhard V 6th Ed., 2006
2 Engineering Metrology R.K.Jain Khanna Publishers 1994
Reference Books
1 Engineering Metrology I.C.Gupta Dhanpat Rai Publications 2013
2 Industrial Instrumentation Alsutko, Jerry. D.Faulk Thompson Asia Pvt. Ltd 2002