Title 3 pEE - EC307 Solved QP ✅

APJ ABDUL KALAM TECHNOLOGICAL UNIVERSITY FIFTH SEMESTER B.TECH DEGREE EXAMINATION, DECEMBER 2017 Course Code: EC 307 Course Name: POWER ELECTRONICS & INTRUMENTATION (ECE) Maximum Marks: 100 Duration: 3 Hours PART A Question 1 is COMPULSORY and Answer EITHER Question 2 OR Question 3 Each Full Question Carries 15 marks. 1. a) Describe the structural features of Power diodes, explain the static and dynamic characteristics. (5) b) Explain the Buck-Boost DC –DC converter with output waveforms. (5) c) Enumerate the types of Power transistors along with their circuit symbols. (5) 2. a) Describe the switching characteristics of Power MOSFET. (5) b) Compare Power MOSFET with BJTs. (5) c) Describe the types of DC-DC converters (5) 3. a) Describe the working of an IGBT. (5) b) Compare the Flyback and Forward isolated converters? (5) c) Discuss briefly about the Switching Mode Regulators? (5) PART B Question 4 is COMPULSORY and Answer EITHER Question 5 OR Question 6 Each Full Question Carries 15 marks. 4. a) Describe Flyback SMPS with relevant circuit and waveforms, Derive the expression for voltage and current involved. (5) b) Compare Half bridge and Full bridge single phase inverters. (5) c) How to measure resistance using Wheastone’s bridge? (5) KTUQBANK.COM
5. a) Compare and contrast on-line and off-line UPS. (5) b) Explain the types of Single Phase inverters (10) 6. a) Describe the basic concepts of Switch-Mode Inverters. (5) b) What is SMPS? Give its operating principle and industrial applications? (5) c) A Maxwell inductance bridge uses a standard capacitor of C3=0.1μF and operates at a supply frequency of 100Hz. Balance is achieved when R1=1.26kΩ, R3=470Ω and R4=500Ω.Calculate the inductance and resistance of the measured inductor and determine its Q factor. (5) PART C Question 7 is COMPULSORY and Answer EITHER Question 8 OR Question 9 Each Full Question Carries 20 marks. 7. a) Give the classification of transducers used in instrumentation system. Give basic principle of operation and typical application of each type of transducer. (8) b) Explain the Digital Storage Oscilloscope with neat diagram. (8) c) Mention the main usage of Analog Electronic Multimeter (4) 8. a) Explain the Spectrum Analyzer with diagram (10) b) Give the merits and drawbacks of LVDT (5) c) What are the applications of strain gauges (5) 9. a) Describe the construction and use of LVDT for measurement of displacement (8) b) Explain the Frequency Synthesizer with neat diagram. (8) c) Write a short note on capacitive transducers. (4) KTUQBANK.COM