Part-A (UNIVERSITYQUESTION BANK)1. What is legal metrology?2. Differentiate between sensitivity and range with suitable example3. State the working principle of an electronic comparator4. What are the advantages of electrical and electronic comparator?5. What are the various methods used for measuring the gear tooth thickness?6.Define :Straightness of a line in two planes7. List the various geometrical checks made on machine tools8.Define machine vision9.What is the principle involved in fluid expansion thermometer?10 Give the principle of hot wire anemometer11. Define the term error and correction12What is meant by nominal size and tolerance?13. What will happen if the gauge blocks are just simply placed one over another and measurements are made?14. What are sine centers?15. Name the corrections applied in measurement of effective diameter by the method of wires ?16. State the methods used for checking gear tooth profile.17. What is the advantage of using laser beam in interferometry?18. Name the types of accuracy specifications used in CMM.19. List any two methods employed for measuring torque.20 Give the composition and useful temperature range of any one commercial thermocouple?21. What do you mean by sensitivity of a measuring instrument?22. define readability.?23. A 250 mm sine bar is to be set to and 350 5 6 .Find the height of the gauge blocks required using any appropriate set gauge blocks.24. State the principle of interferometry.25. What is gear run out?26. What is progressive error in screw threads?27. List any four possible causes of errors in CMM?28. Write the application of laser interferometry.29. What is working principle of thermo couple?30 Distinguish between force and torque

Part-B (UNIVERSITYQUESTION BANK)1. (a) (i) Define calibration and interchangeability (ii) Explain the purpose of calibrating as instrument and discuss the various calibrating system b)(i)Define Errors explain the causes of those errors with suitable example2.a) I) Explain with a neat sketch the working principle of solex pneumatic comparator(ii) describe the working principle , advantage and disadvantages of optical comparators b) (i) Explain with a neat sketch how a Vernier caliper is used for linear measurements (ii) Why is sine bar not suitable for measuring angles above 45 degree?3.Explain the following tooth thickness measurement (i) Constant chord method (ii) Chordal Thickness methodb) (I) Briefly explain the step by step procedure for determining the flatness of a surface with neat sketch (ii) Explain with neat diagram the measurement of straightness using autocollimator4.a.(i) explain with the help of neat sketch the principle of working of laser interferometer. State its application in machine tool metrology (ii) Discuss the applications of computer aided inspection (b) Sketch a bridge type CMM explain the procedure to be used in measurement of various dimensions of typical component using it.5 (a) (i) Explain the method of measuring force using a strain gauge load cell (ii) Explain how and Eddy current dynamometer works. (b) (i) Explain the working principle of an electrical resistance thermometer (ii) what are thermo couples ? States its applications.6. (a) (i) Draw the block diagram of the functional elements of a pressure gauge and explain the function of different functional elements.(ii) Explain with examples the difference between a primary and a secondary standard . what are working standards? (6)(b) (i) Explain the following terms in precision measurements (8)I. Repeatability (ii) Sensitivity (ii) Lag (iV) derived unit.(ii) Explain the construction and working of sigma comparators 7 (a) (i) State the main requirements of slip gauges. How are the slip gauges manufactured? ii) Describe the constructional details of an angle decker and explain how it is used to measure the angle b) (i)Explain how the flatness errors of lapped surfaces are measured with an optical flatii) Explain how the measuring head sensitivity, pneumatic sensitivity and overall sensitivity vary with variation of diameter of measurement orifice.8(a) (i) Explain with the help of a neat sketch explain the function of a Parkinson gear rolling tester used for checking of composite errors (ii) Explain a typical setup using which the measurement of surface finish of surface is carried out.(b) (i) Explain a method of measuring errors in the pitch of screw thread(ii) Describe a method used to check the flatness of a surface plate 9. Explain with a neat diagram the construction and working principle of heterodyne laser interferometer(b) Explain the construction and working of various bridge type CMM 10)(a) Describe the following in connection with pressure measurement(i)Pizo-electric pressure transducer (ii) Variable capacitance transducer (b) Describe with neat sketches(i) Thermocouples (ii) Strain gauge torque meter11 (a) (i) Explain the need for measurement (ii) Differentiate between precision and accuracy with suitable examples(b) (i) Brief explain the various type of input signaL (ii) Explain the different sources of errors 12. Explain the following with neat sketches(i) Differential screw micrometer (ii) Thread micrometer (iii) Blade type micrometer (iV) Micrometer thread gauge(b)Explain the working principle of AC laser interferometer and explain the straightness is measured13. (a) Explain the- block and three point probe are used for measurement of roundness . What are the limitations of V- Block?(b) Explain the following direct instrument measurements(i) Stylus probe type instrument (ii) Tomlinson surface meter14 (a) Explain the construction and working of a laser telemetric system with a neat sketches(b) Explain in detail the various methods of testing accuracy of horizontal milling machine and lathe using interferometer15.(a) (i) Explain the construction and working of a venturimeter (ii) Explain the construction and working of rotometer (b) (i) With a neat sketches explain how bimetallic strips are used for temperatures measurements(ii) Explain the working and purpose of electrical resistance thermistors