BHARATHIDASAN ENGINEERING COLLEGE, NATTRAMPALLI. DEPARTMENT OF MECHANICAL ENGINEERING FAQ

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BHARATHIDASAN ENGINEERING COLLEGE, NATTRAMPALLI. DEPARTMENT OF MECHANICAL ENGINEERING FAQ Year/Sem : III/V Sub.Code/Title: ME6504- METROLOGY & MEASUREMENTS UNIT-I CONCEPT OF MEASUREMENT PART-A 1.

Define Reliability. (April/May2017) 5. Brief on sensitivity in measurement. (Nov/Dec2016) 6. Differentiate between accuracy and precision. (Nov/Dec2016) 7.

1 BHARATHIDASAN ENGINEERING COLLEGE, NATTRAMPALLI. DEPARTMENT OF MECHANICAL ENGINEERING FAQ Year/Sem : III/V Sub.Code/Title: ME6504- METROLOGY & MEASUREMENTS UNIT-I CONCEPT OF MEASUREMENT PART-A 1. Define Traceability. (April/May2017) 2. What is difference between gauging and measurements? (April/May2017) 3. What do you mean by sensitivity of a measuring instrument? (April/May2017) 4. Define Reliability. (April/May2017) 5. Brief on sensitivity in measurement. (Nov/Dec2016) 6. Differentiate between accuracy and precision. (Nov/Dec2016) 7. What are the factors affecting the inherent characteristics of measuring instruments? 8. Explain line and end standards. 9. What is the difference between repeatability and reproducibility? (Nov/Dec 2015) 10. What is the difference between allowance and tolerance? (Nov/Dec 2015) 11. Distinguish between line standard and end standard. 12. What is the relationship between sensitivity and range? 13. State the difference between primary and secondary transducers. 14. Define the term sensitivity 15. What you mean by sensitivity of a measuring instrument? 16. Define precision and accuracy 17. Define readability. 18. What is hysteresis? 19. State the dynamic characteristics of simplified measuring system. 20. Define systematic errors.

2 21. Distinguish between relative error and random error. 22. Mention the various methods used for limiting temperature errors. 23. What are the sources of error? 24. What are the principles of High-precision measurements? 25. What is resolution? PART-B 1. Explain the various errors in measurements. (April/May 2017) 2. What is the need of calibration? Explain the classification of various standards. (April/May 2017) 3. With a suitable example explain the various elements of generalised measurement system. (Nov/Dec 2016) 4. How are end standards derived from line standard? Explain. (AU, Dec 07) 5. With suitable example, explain the difference between precision and accuracy. (AU, Dec 03 & Dec 05) 6. Enumerate the describe characteristics of precision measuring instruments? (AU, Apr 08) 7. Describe the different types of errors in measurement and their causes. (AU, Dec 05) 8. Write short notes on: (i) Calibration (ii) Uncertainty (iii) Reporting results (AU, Dec 07, Dec 08 & Apr 08) 9. Define systematic errors and explain the causes of those errors with suitable example. (AU, Dec 08) 10. Explain various types of systematic and random measurement errors with suitable examples. (AU, Dec 08, Apr 08) 11. What is the need of calibration? Explain (AU, Dec 06) 12. Give the structure of generalized measuring system and explain. (AU, Apr 04 & Dec 07) 13. Explain the classification of various measuring methods. ((AU, Dec 06 & Dec 08) 14. Distinguish between and give appropriate examples in each case: (i) Repeatability and reproducibility (ii) Systematic and Random errors (iii)static and dynamic response (AU, Apr 04 & Dec 06) 15. Discuss the different types of errors and how they can be eliminated? (AU, Dec 07)

3 UNIT-II LINEAR & ANGULAR MEASUREMENT PART-A 1. Why is rocking procedure followed when measuring with a dial bore gauges? (April/May2017) 2. Name any four instruments used measuring internal diameters in components. (April/May2017) 3. What is angle dekkor? (April/May2017) 4. State the principle of interferometry (April/May2017) 5. Write short notes on Bevel protractor. (Nov/Dec2016) 6. Write short notes on interchange ability. (Nov/Dec2016) 7. List out four angular measuring instruments used in metrology.?(may/june 2016) 8. What are the advantages of pneumatic comparator? (May/June 2016) 9. Write any two precautions to be followed when using gauge blocks? (Nov/Dec 2015) 10. Why are lasers used in metrology? (Nov/Dec 2015) 11. What is laser micrometer? 12. Discuss the relative merits and demerits of micrometer and vernier caliper. 13. What is wringing of gauge blocks? 14. Describe the precautionary measures to be taken at various stages of using slip gauges. 15. How the gauge blocks are selected to built-up the length of mm? 16. What are constructional requirements of a good sine bar? 17. What are the chances of errors in using sine bars? 18. What is the advantage of using laser beam in interferometry? 19. What is the use of Autocollimator in mechanical measurements? 20. State Taylor s principle of gauge design 21. What are the limitations of sine bar? 22. Name any two materials commonly used or gauges. 23. What is a comparator? 24. Classify the comparator according to the principles used for obtaining magnification. 25. What is the principle of working of pneumatic comparator?

4 PART-B 1. Explain the construction and working principle of an autocollimator with a neat diagram. (April/May 2017) 2. Explain the construction, working principle and applications of Sine bar. (April/May 2017) 3. What are the general characteristics and selection of measuring instrument? (AU, Nov 04) 2. Explain with a neat sketch how a Vernier caliper is used for linear measurements. (AU, Nov 09) 4. Describe with the help of a neat, a Vernier bevel protector. (AU, Dec 03 & Dec 08) 5. Describe the various components of Bevel protractor. (AU, Apr 08) 6. With neat diagram explain the construction and working principle of depth micrometer? 7. Explain the thread micrometer with neat sketches. (AU, Apr 08) (AU, Dec 06) 8. Explain the working principle of laser micrometer. (AU, Dec Explain how slip gauges are checked for quality. (AU, Dec 04) 10. Describe a method of determining an absolute length of slip gauges using interferometer. (AU, Dec 07) Explain mathematically why error in sine bar increases when the angle being measured Exceeds 45 o. (AU, June 08) 12. Why is sine bar not suitable for measuring angles above 45 o? (AU, Nov 09) 13. How the displacements are measured using laser interferometer? (AU, Nov 04) 14. Sketch and describe the optical system of a laser interferometer? (AU, Nov 03) 15. Explain the working of alignment telescope and mention its applications. (AU, Nov 04) 16. Discuss the working principle of Angle Dekkor with a neat sketch. (AU, Apr 08) 17. Discuss any four applications of pneumatic comparator with schematic diagrams.

5 UNIT-III FORM MEASUREMENT PART-A 1. What is meant by Qualifying the tip in CMMs? (April/May2017) 2. Write any four applications of artificial vision system in manufacturing industries. (April/May2017) 3. What is the application of floating carriage micrometer? (April/May2017) 4. Differentiate between straightness and flatness. (April/May2017) 5. Why laser is used as light source in interferometers? (Nov/Dec2016) 6. Name the different stages involved in the machine vision based measurement. (Nov/Dec2016) 7. What are the different type of geometric tests conducted on machine tools??(may/june 2016) 8. Write the advantages of machine vision system.?(may/june 2016) 9. What are touch trigger probs? (Nov/Dec 2015) 10. What is diffraction grating? (Nov/Dec 2015) 11. Explain drunken error in screw threads. 12. What is the helix angle of M 50x3 2-Statrt thread? 13. Define Lead. 14. What are the various methods used for measuring the gear tooth thickness? 15. Why is monochromatic light used in interferometry instead of white light? 16. State the methods used for checking gear tooth profile. 17. Define constant chord. 18. Define the term cut-off length with respect to surface roughness measurement. 19. Define Lays. Mention any four of its type. 20. Define Straightness. 21. Define concentricity. 22. What is gear runout? Fatima Michael College of Engineering & Technology 23. What is secondary texture of a surface? 24.What is the symbol for fully defining surface roughness? 25Name the various stylus probe instruments used for surface finish measurement.

6 PART-B 1. Explain the working principle of AC LASER interferometer and how the straightness is measured? (April/May 2017) 2. With neat diagram explain the working principle of tough tripper probs. (April/May 2017) 3. With neat sketch brief explain the different types of CMM based on its constructions. (Nov/Dec 2016) 4. How are the major and minor diameters of thread measured? (AU, Nov 04) 5. Derive an expression for estimation of best size wire. (AU, Dec 08 & Nov 04) 6. Describe with a neat sketch the measurement of pitch of internal and external screw threads using a pitch measuring machine. (AU, Dec 09) 7. Briefly explain any one method of measurement the gear tooth thickness. (AU, Apr 08) 8. Explain the constant cord method for measuring the gear tooth thickness. (AU, June 09 & Dec 09) 9. Describe the instrument Gear tooth Vernier caliper. Calculate the gear tooth caliper settings to measure the chordal tooth thickness of a gear of 45 teeth having a module of 4. (AU, Dec 07) 10. Explain the principle of measuring gear tooth thickness by Base tangent method. (AU, Apr 04) 11. With the help of neat sketch explain the principle of operation of rolling gear tester. (AU, Dec 08 & Nov 03) 12. Explain the principle of checking involute profile of gear tooth. (AU, Nov 04 & Dec 06) 13. Explain the working principle of Tomilnson surface meter with a neat sketch. (AU, Nov 03 & June 09) 14. How is the straightness of straight edge measured? (AU, Dec 07) 15. Define straightness. Describe any one method of measuring straightness of a surface. (AU, Nov 03) 16. Describe the stylus-type surface roughness measuring instrument. (AU, Nov 04) 17. With the help of a neat sketch, describe the construction and working of a profilometer. (AU, Nov 05) 18. Describe any one method of testing flatness of a surface plate. (AU, Nov 05) 16. Explain in detail the roundness testing machine. (AU, Dec 07) 19. How to measure the pitch of the screw thread by using the tool Makers Microscope? Discuss in detail. (AU, Dec 06) Fatima Michael College of Engineering & Technology

7 UNIT IV LASER & ADVANCES IN METROLOGY 1. Calculate the best size wire (April/May2017) PART-A 2. Is instrument length greater/lesser than traverse length in surface finish measurements? Why? (April/May2017) 3. Define machine vision. (April/May2017) 4. Name any two image processing techniques. (April/May2017) 5. Define drunken thread. (Nov/Dec2016) 6. What are the various factors affecting surface roughness of a machined component? (Nov/Dec2016) 7. What is best size of wire??(may/june 2016) 8. What are the different factors affecting surface roughness??(may/june 2016) 9. Define material ratio reference to surface finish measurement. (Nov/Dec 2015) 10. How is roundness measured in the least squares circle methods? (Nov/Dec 2015) 11. Define Machine Vision. 12. Mention any four advantages of column type CMM. 13. Name the types of accuracy specifications used for CMM. 14. State any two applications of laser in machine tool metrology. 15. What is the advantage of using laser beam interferometry? 16. Why is monochromatic light used in interferometry instead of white light? 17. What is the purpose of retro-reflectors in LASER interferometers? 18. What is laser micrometer? 19. Define axial slip of machine tool. 20. What are the advantages of computer aided inspection? 21. Distinguish between co-ordinate and conventional metrology. 22. State the applications of CMM in reverse engineering. 23. Why laser is preferred in engineering metrology? 24. List out the different methods of dimensional measurements using laser. 25. List out the merits of CAI.

8 PART-B 1. With a neat diagram explain how gear tooth thickness is measured using a gear tooth Vernier calliper. (April/May 2017) 2. Derive the expression for tooth thickness of a gear in the constant chord method. (April/May 2017) 3. Enlist and explain the different methods used for measuring the roundness.(nov/dec 2016) 4. Discuss the different types of laser light sources. (AU, Dec 07) 5. Sketch the schematics of an interferometer and explain its working. (AU, Dec 03) 6. How the displacements are measured using laser interferometer? (AU, Dec 04, Nov 05 ) 7. Describe the construction & working of a laser micrometer. (AU, Dec 07 & Nov 05) 5. Explain the various geometrical tests that are to be done to get a better accuracy in the machine tool? (AU, Dec 06) 8. How is pitch and yaw errors in X-axis table movement of a vertical milling machine measured? (AU, Dec 04) 9. Explain in detail the various methods of testing accuracy of lathe using laser interferometer. (AU, Dec 05) 10. Describe any one method of testing flatness of a surface plate. (AU, Dec 05). 11. Write detailed notes on Computer Aided Inspection and discuss the needs. (AU, Dec 05, June 09 & Apr 04) 12. Describe the steps involved in measurement in CMM. (AU, Apr 04) 13. Discuss the use of computers in the field of metrology. (AU, Apr 08) 14. What are the applications of vision system in metrology? (AU, Apr 04) UNIT V MEASUREMENT OF MECHANICAL PARAMETERS PART-A 1. What is meant by reliability of measuring instruments? (April/May2017) 2. Write the working principle of pyrometers. (April/May2017) 3. Write any two advantages of thermocouple. (April/May2017) 4. What is the principle behind electrical resistance thermometer? (April/May2017) 5. Give the principle of hot wire anemometer. (Nov/Dec2016) 6. Name the materials used for thermocouples. (Nov/Dec2016) 7. What are load cells??(may/june 2016)

9 8. Mention the principle involved in bimetallic strip??(may/june 2016) 9. Why are measuring instruments calibrated? (Nov/Dec 2015) 10. What is the working principle behind strain gauges? (Nov/Dec 2015) 11.State any two principles of force measurement. 12.What is the general rule used for accelerometers to provide satisfactory performance? 13.Define Torque. 14.Differentiate between force and torque. 15.List any methods employed for measuring torque. 16.What are the differences between orifice and Venturimeter? 17.Write the working principle of hot wire anemometer. 18.List the instruments used for measuring temperature. 19.What is the working principle of thermocouple? 20.Give the composition and useful temperature range of any one commercial thermocouple. 21.How is flow measured using ultrasonic flow meter? 22.What are pyrometers? Mention the types. 23. What is the principle of thermo couple? 24. What are the important elements of measurements? 25. What are the differences between orifice and venturimeter? PART-B 1. With a neat diagram explain (I) Rotameter (ii) Resistance thermometer. (April/May 2017) 2. With a neat diagram explain (i) Pitot tube (2) Bi-Metallic Strip. (April/May 2017) 3. Explain briefly any one method of torque measurement. (AU, Dec 07) 4. Briefly explain a torque meter. (AU, Apr 08) 5. Describe with neat sketches strain gauge torque meter. (AU, Dec 09) 6. Describe any one method used to measure very high pressure. (AU, Dec 08) 7. Describe the variable capacitance transducer in connection with pressure measurement. (AU, Dec 09)

10 8. Describe the construction of a hydraulic dynamometer and explain how it is used for power measurement. (AU, Dec 03) 9. How to measure the power by using rope brake dynamometer? Explain with neat diagram. (AU, Dec 06) 10. Explain the construction & working of a Venturimeter. (AU, June 09) 11. Describe a method of orifice flow measurement using a suitable instrument. (AU, Dec 08) 12. How to use the pitot tube for flow measurement? (AU, Dec 07) 13. Rotometer Explain in detail with sketch. (AU, Apr 07 & June 09) 14. Explain the working of bimetallic strip type temperature measurement system. (AU, Dec 07 & June 09) 15. Describe with neat sketches of Thermocouples. (AU, Dec 09 & Apr 04) 16. Explain the method of measuring temperature of a body using electrical resistance thermister. (AU, Dec 08)

DHANALAKSHMI COLLEGE OF ENGINEERING. (Dr.VPR Nagar, Manimangalam, Tambaram) Chennai

DHANALAKSHMI COLLEGE OF ENGINEERING (Dr.VPR Nagar, Manimangalam, Tambaram) Chennai - 601 301 DEPARTMENT OF MECHANICAL ENGINEERING III YEAR V SEMESTER ME6504 ENGINEERING METROLOGY AND MEASUREMENTS QUESTION