VALLIAMMAI ENGINEERING COLLEGE

VALLIAMMAI ENGINEERING COLLEGE SRM Nagar, Kattankulathur 603 203 DEPARTMENT OF ELECTRONICS AND INSTRUMENTATION ENGINEERING QUESTION BANK VI SEMESTER EI6601 Modern Electronic Instrumentation Regulation 2013 Academic Year 2017 18 Prepared by Ms. Z.Jenifer, Assistant Professor/EIE Mr. I.Andrew Xavier Raj, Assistant Professor/EIE

VALLIAMMAI ENGINEERING COLLEGE SRM Nagar, Kattankulathur 603 203. DEPARTMENT OF ELECTRONICS AND INSTRUMENTATION ENGINEERING QUESTION BANK SUBJECT : EI6601 MODERN ELECTRONIC INSTRUMENTATION SEM / YEAR:V SEMESTER / III YEAR UNIT I -ELECTRONIC INSTRUMENTS SYLLABUS Electronic Voltmeter and their advantages Types, Differential amplifier, source follower, rectifier True rms reading voltmeter Electronic multimeter and ohmmeter Current measurement Power measurement - Microprocessor based DMM with auto ranging and self diagnostic features. PART - A Q.No Questions BTLevel Competence 1. Define instrument. 2. What are the advantages of electronic voltmeters over conventional ones? 3. What are the general characteristics of digital voltmeter? 4. Show the practical applications of multi meter. 5. State the limitations of true RMS meter. 6. Generalize the use of true RMS meter. 7. List the advantages and disadvantages of an electronic multi meter. 8. Give the essential parts of a rectifier type electronic volt meter. 9. Discuss about electronic voltmeters. 10. Differentiate between a series type ohmmeter and a shunt type ohmmeter. 11. Point out the advantages of differential amplifier. 12. Formulate the closed loop gain equation for source follower type of electronic voltmeter. 13. Summarize the advantages of true RMS meter. 14. Discuss about the multi meter. 15. List the elements present in an electronic ohmmeter. Knowledge 16. Classify electronic voltmeters. 17. Compare the current measurement and power measurement.

18. Give the salient features measurement of power at audio frequencies. 19. Show the applications of digital multi meter (DMM). 20. the automatic ranging in DMM. PART B 1. (i) Describe the construction, working principle of True RMS reading voltmeter with neat sketch (10) (ii)what are the applications of True RMS reading voltmeter? (3) 2. Describe the various methods of measurement of power at radio frequencies.(13) 3. (i)describe the working of electronic Ohmmeter with the help of neat diagram.(8) (ii) What are the advantages, disadvantages and application of electronic Ohmmeter.(5) 4. (i) What are the advantages of electronic voltmeter.(5) (ii) Examine the operation of differential amplifier with a neat circuit diagram.(8) 5. (i) Discuss in detail about the circuit diagram and operation of a source follower type voltmeter.(8) (ii) Infer the advantages, disadvantages and application of source follower type voltmeter.(5) 6. (i) Discuss the working of electronic voltmeters which use rectifiers with its circuit diagram.(7) (ii) Describe the AC/DC voltmeter and ammeter section of a multimeter.(6) 7. Explain with the help of a block diagram, the various parts of an electronic multimeter. (13) 8. (i) Illustrate electronic voltmeter with neat sketch. (6) (ii) Classify the various types of electronic voltmeter in detail with neat sketch. (7) 9. Illustrate the operation of microprocessor based digital multimeter (DMM) with auto ranging and self diagnostic features, with necessary diagram. (13) 10. Explain the hardware and flowchart of a microprocessor based digital multimeter with auto ranging and Self diagnostic features. (13) 11. Explain the circuit diagram and operation of differential electronic Voltmeter. (13) 12. Explain the construction, working principle and applications of True RMS reading voltmeter with neat sketch.(13) 13. Explain the various components and methods for current measurement. (13) 14. Generalize the various methods of measurement of power at audio frequencies.(13)

PART-C 1. A difference amplifier type electronic voltmeter shown in below Fig has the following data. Voltage applied to left FET v1 = 1 V a.c drain resistance, rd = 100 kω transconductance, gm = 0.005 mho RD = 10 kω Resistance of PMMC Meter, Rm = 50 Ω (i) the value of current through ammeter.(10) (ii) How it can be calibrated as electronic voltmeter. (5) 2. The electronic voltmeter shown below has the following data : Rs = 1050Ω, rd = 100kΩ and, gm = 0.005 mho A PMMC ammeter with an iternal resistance of 50Ω is used as the detector. If the input voltage is 1V, the approximate value of current through the ammeter. 3. Design the circuit of a d.c voltmeter using a direct coupled amplifier and how small values of voltages and current can be measured with it.(15) 4. Design the circuit of true rms reading voltmeter using thermocouples and how these voltmeters are free from waveform errors.(15)

UNIT II - CATHODE RAY OSCILLOSCOPE AND SIGNAL ANALYZERS SYLLABUS General purpose cathode ray oscilloscope Dual trace, dual beam and sampling oscilloscopes Analog and digital storage oscilloscope - frequency selective and heterodyne wave analyzer Harmonic distortion analyzer Spectrum analyzer. PART - A Q.No Questions BTLevel Competence 1. Why storage scopes are necessary in measurements? 2. Define Cathode ray oscilloscope. 3. What information is provided by the spectrum analysis of a signal? 4. Point out the advantages of dual trace oscilloscope. 5. dual beam oscilloscope. 6. Give some applications of sampling oscilloscope. 7. Illustrate why is a triggering circuit provided in a CRO? 8. How does the sampling CRO increase the apparent frequency response of an oscilloscope? 9. List the applications of storage oscilloscope. 10. List the advantages of analog storage oscilloscope. 11. Generalize the modes of operation in digital storage oscilloscope. 12. Discuss the purpose of Automatic Frequency Control (AFC) in heterodyne wave analyser. 13. Mention the different types of distortion. 14. Point out the frequency range of different types of signal analyzers. 15. Summarize about frequency selective wave analyzer. 16. Deduce the difference between a wave analyzer and a harmonic distortion analyser. 17. Formulate an equation for the measured value of total harmonic distortion (THDM). 18. List the various applications of hetero dyne wave analyzer. 19. How does a wave analyser functionally differ from a spectrum analyser? 20. How are spectrum analyzers classified? PART B 1. Develop an expression for deflection D in CRO, which is the deflection of the electron beam.(13) 2. Explain in detail about the working of various parts of Cathode Ray Tube with its internal structure.(13)

3. (i)describe the principle of General purpose oscilloscope with neat block diagram.(10) (ii)mention the advantages of storage oscilloscopes.(3) 4. (i) With block diagram and various waveforms at each block, Explain the operation of sampling oscilloscope. (7) (ii) Infer the advantages, disadvantages of dual trace over dual beam CROs for multiple trace. (6) 5. Discuss in detail about the following types Oscilloscopes with neat diagram. a. Dual Trace Oscilloscope.(5) b.dual beam Oscilloscope. (4) c. Sampling Oscilloscope.(4) 6. (i) What is the principle of secondary emission ratio.(3) (ii) Describe in detail about the Analog Storage Oscilloscopes.(10) 7. Sketch the basic block diagram for a DSO. Sketch the system wave forms and explain its operation.(13) 8. (i)compare and explain analog storage oscilloscopes with digital storage oscilloscopes.(10) (ii) Summarize the applications of a wave analyzer.(3) 9. Define waveform analyzer and explain in detail about frequency selective type wave analyzer with block diagram.(13) 10. (i)label the parts and explain the working of a heterodyne type wave analyzer circuit. (10) (ii)list the applications of a Spectrum analyzer. (3) 11. Describe the circuits and working of wave analyzers used for audio frequency and megahertz range. (13) 12. Describe briefly about a. Types of distortion.(4) b. Total harmonic distortion.(4) c. Harmonic distortion analyser.(5) 13. Explain with neat block diagram about the operation of heterodyne wave analyzer. (13) 14. Sketch and explain in detail about the Spectrum analyzer. (13) PART-C 1. Formulate an expression for vertical deflection of an electron beam in a CRT. (15)

2. An electrically deflected CRT has a final anode voltage of 2000V and parallel deflecting plates 1.5 cm long and 5 mm apart. If the screen is 50 cm from the centre of deflecting plates, (i) Beam speed. (5) (ii) The deflection sensitivity of the tube(5) (iii)the deflection factor of the tube.(5) 3. The deflection sensitivity of an oscilloscope is 35 V/cm. If the distance from the deflection plates to the CRT screen is16 cm, the length of the deflection plates is 2.5 cm and the distance between the deflection plates is 1.2cm. the acceleration anode voltage?.(15) 4. How attenuators are designed with particular reference to frequency compensation?(15) UNIT III- WAVEFORM GENERATOR SYLLABUS Wien s bridge and phase shift oscillators Hartley and crystal oscillators Square wave and pulse generators Triangular wave-shape generator - Signal and function generators Q meter Electronic Counters. PART A Q.No Questions BTLevel Competence 1. Write the expression for frequency of oscillation of phase shift oscillator. 2. Name the essential parts of an oscillator. 3. Distinguish between Wien s bridge and phase shift oscillators. 4. Give the condition of oscillation for Hartley oscillator. 5. Examine how oscillations occur in a crystal oscillator? 6. Classify the different sinusoidal oscillators. 7. Discuss about square wave generator. 8. Compare square wave generator and pulse generator. 9. Differentiate an oscillator and an amplifier. 10. Define triangular wave-shape generator. 11. Name two low frequency and High frequency oscillators. 12. Infer the Difference between an oscillator and an amplifier. 13. Express the range of RF, VHF and UHF. 14. Classify signal generator. 15. Which oscillator uses both positive and negative feedback? Justify?

16. Crystal oscillators are superior to other oscillators. Justify? 17. Generalize a resonant circuit oscillator. 18. Rewrite the functions of a frequency counter. 19. List the applications of function generator. 20. Define Q meter. PART B 1. (i) With a neat circuit diagram, describe the working of a Wien bridge oscillator.(7) (ii) Derive an expression for the resonant frequency of the Wien Bridge Oscillator. Give its advantages and disadvantages.(6) 2. With neat circuit diagram explain the operation of an RC phase shift oscillator and develop the condition for oscillation and resonant frequency with BJT.(13) 3. (i) Describe the operation of Hartley oscillator with a neat diagram.(7) (ii)derive the expression for frequency of oscillation and condition of oscillation of Hartley oscillator.(6) 4. Explain in detail about a. Pulse generators.(8) b. Square wave generators.(8) 5. Explain the operation of crystal oscillator with neat diagram and write the expression for its frequency of oscillation.(13) 6. (i)write in detail about various types of feedback oscillators.(10) (ii)define oscillator and what are the classifications of oscillator? (3) 7. (i) Design a square wave generator for generating 1 KHZ signal.(6) (ii) Describe with block diagram, how different standard waveforms are generated in a typical function generator.(7) 8. Write shorts notes on (i) Triangular wave shape generator.(7) (ii) Signal generator. (6) 9. (i) Develop a circuitry to generate triangular wave of 2 KHZ frequency.(10) (ii) List the factors that causes error in Q meter.(3) 10. (i) Examine the working of a Function generator with neat sketch. How can you vary the Amplitude and Frequency of the output wave form? (10) (ii) Distinguish between the signal generator and function generator.(3)

11. What is Q meter? Explain about its application and discuss in detail about any one method of measurement using a Q meter.(13) 12. (i) Discuss in detail about the principle of Q meter.(5) (ii) Obtain an expression for series Q meter circuit. (5) (iii) Explain about its various applications. (3) 13. A circuit having an effective capacitance of 160pF is tuned to a frequency of 1.2MHz. In this the current falls to 70.7% of its resonant value when the frequency of an emf of constant magnitude injected in series with the circuit deviates from the resonant frequency by 6KHz. Calculate the Q factor and effective resistance by 6KHz. (13) 14. (i)describe with circuit diagram the various electronic counters. (10) (ii) Summarize the advantages, disadvantages and applications of electronic counter.(3) PART-C 1. Deduce how Barkhausen criteria is met with wein bridge oscillator.(15) 2. Design a wein bridge oscillator around the following specifications, f = 15kHz, VCC = ±10V, Iin = 1 µa, IR4 = 100 Iin.(15) 3. Prove that in a R.C.phase shift oscillator the gain of the amplifier should be atleast 29 to sustain oscillations.(15) 4. Design a signal generator using envelope feedback for amplitude modulation.(15) UNIT IV- VIRTUAL INSTRUMENTATION SYLLABUS Virtual instrumentation (VI) Definition, flexibility Block diagram and architecture of virtual instruments Virtual instruments versus traditional instruments Software in virtual instrumentation -VI programming techniques DAQ cards for VI applications DAQ modules with serial communication PART A Q.No Questions BTLevel Competence 1. Define virtual instrumentation 2. Describe flexibility. 3. Define clusters. What is the use of clusters? 4. What are the advantages of graphical display? 5. Differentiate between virtual instruments and traditional instruments. 6. Distinguish Chart and graph 7. Compare virtual instruments and traditional instruments. 8. Illustrate what does replace operation do to a file?

9. Do string operations require special operators? 10. Classify the tools available in control palette. 11. Point out the types of loops available for VI. 12. Conclude why is virtual instrumentation necessary? 13. Explain sequence structure. 14. sub VI. 15. Compose the use of formula node. 16. Give the types of signals that can be acquired by DAQ. 17. Discuss a plug in DAQ device. 18. Point out the components of DAQ Cards. 19. Describe about DAQ. 20. Identify few popular serial communication protocols supported by DAQ modules. PART B 1. Write short notes on: a. Virtual instrumentation programming techniques.(5) b. Performance comparison of virtual instruments and traditional instruments.(5) c. Flexibility of virtual instruments.(3) 2. (i)briefly describe the case structure, event structure and sequence structure operations.(7) (ii)write a short notes on various application of virtual instrumentation.(6) 3. With a neat block diagram describe the architecture of a Virtual instrumentation system. Also state its advantages and disadvantages over conventional instruments. (13) 4. Explain in detail about conventional and virtual instrument with its block diagram.(13) 5. (i) Write a VI programme to read the data from a file and to write data in another file using I/O operations. (7) (ii) Write a VI to check if a number is positive or negative. If yes, then the VI should calculate and display the square root. Otherwise it should display a message and give a value of -9999.00 as output. Solve using (a) case structure (b) select function and (c) formula node. (6) 6. Discuss the essential requirements of DAQ cards for virtual instrumentation systems. (13) 7. (i) Examine how labview can be used to acquire, analyze and present a measurement and automatic application. (7) (ii) Illustrate the operation of shift register showing the front panel and block diagram to find the current count, previous count, count two iterations ago and count three iterations ago and explain.(6)

8. (i) Explain in detail about software in virtual instrumentation system.(10) (ii) Explain virtual instrumentation system.(3) 9. (i) Explain arrays and clusters operations in detail. (7) (ii) Explain modular programming and show how to create a Sub VI using an example. (6) 10. (i) Develop VI using for loop and while loop for counting.(4) (ii) Obtain the function of a shift register using VI.(3) (iii) Develop VI to find N factorial.(3) (iv) Discuss in detail about case structure of VI with example. (3) 11. (i)sketch and explain the block diagram of a PC based DAQ card that can be used for VI applications.(7) (ii)give an example for VI programming.(6) 12. Write in detail about loops and charts. Explain them with an example. Explain in detail about local variables with examples. (13) 13. List the various DAQ cards used for virtual instrumentation applications and explain any one of DAQ module with serial communication in detail. (13) 14. a VI to realize digital voltmeter by acquiring the data using DAQ. (13). PART C 1. a VI to develop a bottle filling system with neat diagram. (15) 2. Explain the R232 connections for DAQ modules with neat diagram. (15) 3. Explain with a neat VI diagram how temperature is controlled? Use appropriate DAQ cards for obtaining real time data. (15) 4. Develop Signal Generator using DAQ Card with neat diagram. (15) UNIT V- TELEMETRY SYLLABUS General telemetry system voltage, current and position telemetry systems Radio frequency telemetry Frequency modulation, pulse-amplitude modulation and pulse-code modulation telemetry Frequency and time multiplexing. PART A Q.No Questions BT Competence 1. Define telemetry. 2. Rewrite the applications of position telemetry system. 3. List the merits and demerits of voltage telemetry system.

4. Name the components of telemetry system. 5. Compile the merits and demerits of current telemetry system. 6. List the advantages of radio frequency telemetery system. 7. Discuss about land line telemetery system. 8. Give the types of telemetry system. 9. Discuss about frequency modulation. 10. Give the principle of FM Telemetry System. 11. Examine PAM and its applications. 12. Classify the advantages of FM over AM. 13. Classify the advantages and Disadvantages of frequency division multiplexing. 14. the different types of land line telemetering system. 15. Point out the disadvantages of radio telemetry system. 16. Point out the need for modulation. 17. Summarize radio frequency telemetry system. 18. Summarize time division multiplexing. 19. Define PWM. 20. Define PCM. PART B 1. (i) What is radio frequency telemetry? (3) (ii) List and explain the various types of modulation methods.(10) 2. Describe the working principle and operation of following multiplexing methods: (i) Frequency multiplexing. (7) (ii) Time multiplexing. (6) 3. (i) Tabulate the comparison between frequency modulation and amplitude modulation.(7) (ii) Write shorts notes on Frequency Modulation and amplitude modulation.(6) 4. (i) Define and explain the radio frequency telemetry system with its block diagram.(7) (ii)write the basics of frequency and time division multiplexing. (6) 5. Describe the torque balance telemetering system. (13) 6. Discuss in detail about the following. (i) Pulse Amplitude Modulation (PAM) telemetry. (7) (ii) Pulse Code Modulation (PCM) telemetry. (6) 7. Describe the different methods of data transmission. Explain the block diagram of general telemetry system. (13)

8. (i) Classify the different types of telemetering systems. (3) (ii) Explain in detail about the voltage telemetering system.(10) 9. Examine the position telemetering system and mention its disadvantages.(13) 10. Explain with block diagram, merits and demerits of any one analog and digital pulse telemetry system. (13) 11. Explain in detail about various types of land line telemetry system. (13) 12. Explain in detail about various types of pulse modulation telemetry system. (13) 13. Explain the frequency modulation telemetry system.(13) 14. Generalize the following current telemetering system. (i) Basic current telemetering system. (3) (ii) Motion balance current telemetering system.(5) (iii)force balance current telemetering system.(5) PART-C 1. Explain why it is essential to use radio frequency telemetry. Summarize it with some relevant examples. (15) 2. Formulate the expressions for modulation index, the power conveyed by the carrier and the power transmitted by upper and lower frequency bands. Find the condition for maximum power in the A.M wave(15) 3. A data signal have a frequency component from d.c to 1 khz is to be transmitted using a modulation method. the minimum carrier channel bandwidth using the following mwthods of modulation: (i) Amplitude modulation(5) (ii) frequency modulation with maximum deviation in carrier frequency being 1.5kHz(5) (iii) pulse code modulation using an 8 digit code.(5) 4. In a A.M system the carrier has a frequency of 1 MHz. The permissible width is ±5 khz. The intelligence which modulates the carrier, has a bandwidth of 1 khz. Deduce the number of transmission channels for efficient use of transmission media?(15)