Course Title: Electronic Measurements and Instrumentation

Course Title: Electronic Measurements and Instrumentation Course Code : 15EC34T Semester : Third

UNIT-1: Basics of measurements 1. Explain the necessity of measurements. 2. List and explain methods of measurements. 3. Define speed of response, dynamic error, accuracy, fidelity and resolution w.r.t measurements . 4. Define precision, error log, instrument and sensitivity w.r.t measurements. 5. Define error. Indicate the ways of reducing systematic and random errors. 6. Explain IEEE standards 7. Compare the features of AC and DC bridges. 8. A circuit was tuned for resonance by eight different students and the values of resonance frequency in KHz was recorded as 532, 548, 543, 535, 546, 531, 543 and 536. Calculate the arithmetic mean, average deviation and variance. 9. Sketch the schematic of Wheatstone bridge. Mention its relevance in measurements? 10. Following are the set of readings taken by two meters for a true value of 5v. Meter A: 4.81V, 4.81V, 4.79V, 4.78V Meter B: 4.92V, 5.09V, 4.83V, 5.16V Choose the meter with better precision. Justify your answer after defining precision.

UNIT-2: Transducers 1. List the factors which decide the selection of a transducer. 2. List and explain types of transducers. 3. Explain principle of Strain Guage. List its types. 4. Explain capacitive transducers. 5. Explain principle of LVDT. 6. List the differences between Thermocouple and Thermistors. 7. List the features of PIR sensors 8. Explain the principle of piezoelectric transducers. list its applications. 9. Write a note on proximity sensor. 10. Write a note on digital optical encoders. 11. A strain gauge has an unstrained length of 10cm and a resistance of 100KΩ.when its length reduces to 9.9 cm, the resistance decreases to 98 KΩ. Calculate its gauge factor.

UNIT-3: Analog Meters 1. With a neat diagram explain the working principle of PMMC instrument. 2. With a neat diagram explain the working principle of EDM instrument. 3. Define calibration and summarize the calibration process of any instrument of your choice. 4. Compare the features of electromechanical instruments with electronic meters 5. Explain the working of Ohmmeter. 6. Explain working of FET input voltmeter. 7. Explain working principle of Rectifier type instruments. 8. Explain the working principle of chopper type voltmeter. 9. Problems on extending range of voltmeter and ammeters. 10. Write a note on calibration of meters.

UNIT-4: Testing instruments

1. List the applications of CRO 2. List the applications of DSO 3. List the applications of spectrum analyzer 4. Explain the working of a standard RF signal generator 5. Explain with a block diagram how function generator produces different types of wave forms. List its applications 6. Explain the working of a CRO with a block diagram. 7. List the applications of sweep frequency generator, distortion analyses and wave analyzer. 8. Describe the working of DSO. 9. Explain different types CRO probes. 10. Explain the working of wave analyser. List the types.

UNIT-5: Digital Meters

1. List the advantages and disadvantages of digital meters 2. Compare analog meters with digital meters 3. Sketch the block diagram of a digital LCR meter and explain. 4. Sketch the block diagram of a digital frequency meter and explain. List its advantages. 5. Show how time gap between two events can be measured digitally. 6. Illustrate the different modes of electronic counter. 7. Explain the working of a successive approximation type digital voltmeter 8. Explain the working of a digital voltmeter which works on the principle of voltage to time conversion. 9. Sketch the block diagram of a digital multimeter. 10. Write a brief note on microprocessor based instruments 11. List the features of IEEE488 GPIB.

UNIT-6: Instrument Maintenance

1. List the precautions to be taken to achieve personnel safety during servicing 2. List the causes of interference 3. Describe the role of functional block diagram in servicing. 4. Explain how shielding reduces interference. 5. Explain how grounding reduces interference 6. List the precautions to be taken to prevent instrument damage during servicing. 7. Explain the procedure of generalized trouble shooting with a flow chart.