MEASUREMENT AND INSTRUMENTATION QUESTION BANK UNIT I INTRODUCTION. Part A

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1 MEASUREMENT AND INSTRUMENTATION QUESTION BANK UNIT I INTRODUCTION Part A 1. Define Standard deviation. 2. Why calibration of instrument is important? 3. What are the different calibration methodologies? 4. Define Calibration. 5. List the functional elements of the measurement systems. 6. What are the main static characteristics? 7. Define static error. 8. What are the types of errors in measurements? 9. Define variance. 10.What is standard? What are the different types of standards? 11.What is the function of manipulation element in a measurement system? 12.What is median? 13.Distinguished between steady state response and transient response. 14.What is meant by accuracy of an instruments? Page 1

2 15.What is dynamic response of an instrument? Part B 1. Draw the block diagram showing the basic functional elements of instrument and explain the functions of each. 2. Explain how an instrument is calibrated. 3. Explain on the static and dynamic characteristics of a measurement system. 4. Write briefly on instrument standards. 5. Explain in detail the different types of errors in measuring instruments. 6. What are the different standard inputs for inputs for studying the dynamic response of a system? Define and sketch them. 7. Explain significance of negative feedback. 8. Derive the expression for magnitude and phase of a first order system when subjected to a sinusoidal input signal. Draw the magnitude and phase versus frequency plots. 9. Explain in detail calibration technique and draw the calibration curve in general. 10.Define and explain any five static characteristics of an instrument. UNIT 2 ELECTRICAL AND ELECTRONICS INSTRUMENTS Part A Page 2

3 1. List the advantage of digital voltmeter. 2. Explain the principle of digital phase meter. 3. Define creeping. 4. What is the working principle of wattmeter employed in measuring equipment? 5. What are the advantages of digital instruments over analog instruments? 6. How the resistors are are checked using digital multimeters? 7. What are the various types of Digital Voltmeter? 8. What is the precaustion to be followed while using current transformer? 9. What is the reason for using MI instruments on both AC and DC? 10.Explain the principle of digital phase meter. 11.What is the need to evaluate phase angle error in instrument transformer? 12.Give the advantages of moving iron meters? 13.How are the analog instruments classified on the basis of method used for comparing the unknown quantity? 14.Give the advantages of moving iron instruments? 15.What are the different methods measurement of frequency in the power frequency range? Part B 1. Derive the torque equation of electrodynamometer type instrument. Page 3

4 2. Explain the working of attraction type and repulsion type moving iron instruments with neat diagrams. 3. Explain with neat circuit diagram the working of successive approximation type DVM. 4. Draw the circuit diagram of digital phase meter and explain the working. 5. Give the construction and principle of operation of single phase induction type energy meter. 6. Describe the construction and functioning of mechanical type frequency meter. 7. Describe the construction and working of PMMC instrument. Derive the equation for deflection if the instruments is spring controlled. 8. Describe the step by step method for determination of B H curve of a magnetic material. 9. Explain with neat circuit diagram the working of any one type of digital voltmeter. 10.With neat figures explain the construction, working principle of a three phase wattmeter. What is the importance of deflecting torque in these analog instruments. UNIT 3 COMPARISON METHODS OF MEASUREMENTS Part A 1. What is the roll of toroidal core in a trapped ratio transformer? 2. State the applications of AC potentiometers. Page 4

5 3. What are active and passive bridge circuits? 4. What are leakage current effects? 5. List the applications of wheatstone bridge. 6. List the technical parameters in grounding. 7. Draw the Maxwell s bridge and give the balance equation. 8. What is electromagnetic interference in instruments? 9. What is the basic principle used in potentiometer? 10. What are the practical difficulties in AC potentiometer? 11. State the advantage of AC potentiometers. 12. How the current transformer and potential transformer are connected in a circuit? 13. State the advantages of wein bridge. 14. Which type of detector is used in AC bridges? 15. State the advantages of price s guard wire method. Part B 1. Derive the bridge balance condition for the Maxwell bridge Schering bridge. 2. Describe with help of suitable diagrams low a DC potentiometer can be used for calibration of voltmeter, ammeter and wattmeter. Page 5

6 3. Describe with help of suitable diagrams low as DC potentiometer can be used for calibration of voltmeter, Ammeter and wattmeter. 4. Explain voltage sensitive self balancing bridge, and derive the bridge sensitivity of voltage sensitive bridge with fundamentals. 5. Describe the ciruit of Kelvin double bridge used for measurement of low resistance. Derive the conditions for balance. 6. Explain in detail the measurements that are made in the following bridge circuits. 7. Discuss the advantages and limitations of electromagnetic interference in measurements. 8. Draw Maxwell s AC bridge and give the balance equation of resistance. 9. What two conditions must be satisfied to make an ac bridge balance? 10.Describe the general form of an AC bridges and discuss its importance conculsion. UNIT 4 STORAGE AND DISPLAY DEVICES Part A 1. What are the advantages of LCD over LED? 2. What do you mean by X Y recorders? 3. What are the various methods of recording data? 4. List few disadvantages of frequency modulation recording. 5. Give few advantages of frequency modulation recording. Page 6

7 6. State the features of ink jet printers. 7. Draw a neat diagram on X Y recorder. 8. Mention the purpose of line printers. 9. Define deviation ratio. 10.List the advantages of direct recording. 11.What are the advantages of magnetic tape recorders? 12.List the components of a magnetic tape recorder. 13.List out diffent materials used in manufacturing LED s. 14.Write notes on dual trace cathode ray oscilloscopes. 15.How are LCDs created? Part B 1. Describe the basic components of magnetic recorders. 2. Explain briefly various types of printers. 3. Explain the modes of operation of digital storage oscilloscope. 4. Explain the principle of operation and types of LED. 5. Explain the internal structure of CRT and describe the principle of electrostatic focusing. Page 7

8 6. Describe the different part of a CRT with a help of a neat diagram. 7. Write briefly on any two. i) Dot matrix display ii) iii) Advantage and principle of LCE displays Digital data logger. 8. Describe the performance of digital plotter. 9. What is an XY recorders? How do you distinguish is from X t and Y t recorders? 10.Give the basic block diagram of a digital data recording system. TRANSDUCERS AND DATA ACQUISTION SYSTEMS Part A 1. Define the primary and secondary transducers. 2. State the performance parameters of ADC. 3. Define Transducer. 4. Write short notes on LVDT. 5. What are the two physical parameters in strain gauge? 6. How A/D converter can be used as encoder? 7. How are strain gauge used for pressure measurement? 8. What is Inverse transducer? Page 8

9 9. What is Smart sensor? 10.Mention some applications of smart sensor. 11.What is meant by digital transducer? 12.Give the principle of capacitive transducers. 13.What is meant by quantization error? 14.State Piezoelectric effect. 15.What are the essential functional operations of a digital data acquisition system? Part B 1. Explain the selection criteria for the transducers. 2. With neat diagram explain potentiometer resistance transducer. List advantages and disadvantages. 3. Discuss optical fiber displacement sensors. 4. What are the types of DAS? Discuss the different multiplexing schemes used in multichannel DAS. 5. How the transducers are classified on the basis of principle of operation? 6. Explain the generalized diagram of a digital data acquisition system and give the uses of data acquisition system. 7. How are A/D converters classified? 8. How are strain gauge used for pressure measurements? 9. With neat figure explain LVDT for velocity measurement. Page 9

10 10.Discuss in detail about: i) Optical encoder. ii) iii) Resistive encoder. Shaft encoder. List their advantages and disadvantages. Page 10

Question Paper Code : B.E./B.Tech. DEGREE EXAMINATION, NOVEMBER/DECEMBER Third Semester. Electrical and Electronics Engineering

Question Paper Code : B.E./B.Tech. DEGREE EXAMINATION, NOVEMBER/DECEMBER Third Semester. Electrical and Electronics Engineering Question Paper Code : 31391 B.E./B.Tech. DEGREE EXAMINATION, NOVEMBER/DECEMBER 2013. Third Semester Electrical and Electronics Engineering EE 2201/EE 33/EI 1202/10133 EE 302/080280016 MEASUREMENTS AND