Power Electronics (KEE-603) - AKTU Question Paper 2022-23
B.Tech · Semester 6 · Free PDF Download
This is the official AKTU Power Electronics Previous Year Question Paper for B.Tech Semester 6, academic session 2022-23. Published by Dr. A.P.J. Abdul Kalam Technical University (AKTU/UPTU), Lucknow. Free PDF download — no login required.
Course:B.Tech
Semester:Semester 6
Session:2022-23
University:AKTU / UPTU
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Questions Asked in 2022-23
Power Electronics (KEE-603) — complete question paper
Section AAttempt all questions in brief. 2 x 10 = 20
- aList any four advantages of power electronic converters
- bExplain the term latching and holding current in SCR
- cDraw the circuit arrangement and output characteristics of power BJT
- dExplain the working of TRIAC
- eCompare non-circulating current mode and circulatin g current mode of operation of Dual-Converters
- fHow Freewheeling diode improves the power factor of the system ?
- gDraw the circuit arrangement of two-stage and mult i-stage sequence control of a.c. voltage controllers
- hDiscuss in short the working of single-phase half-wave a.c. voltage controllers. (i) Explain Pulse Width Modulation ( PWM ) technique. (j) Compare voltage source and current -source inverters
Section BAttempt any three of the following: 10x3=30
- aDraw circuit symbol and static V-I characteristic of the following power semiconductor devices. (i) Thyristor (ii) MOSFET Calculate the number of thyristors with a rating o f 400 V and 95 A required in each branch of a series parallel combination for a circuit with total voltage and current rating of 11 KV and 1.7 kA respectively. As sume a derating factor of 16
- cExplain in detail the working of single-phase fully -controlled bridge converter with circuit diagram in the following two-modes: (i) Rectifying mode (ii) Inversion mode. Discuss the working of single phase to single-phase step up and step down cyclo converters with power circuit diagram and waveforms
- eWrite short note on current source inverter with neat diagram
Section CAttempt any one part of the following: 10x1=10
- aSummarize specification of power electronic switche s and their applications of the followings (i) IGBT (ii) MOSFET
- bLatching current for an SCR inserted in between a D C voltage source of 2 20V and the load is 90 mA. Compute the minimum width of Gat e Pulse current required to turn on this SCR in the case of load R = 2 5 Ω in series with L = 0. 3 H
- bA step up chopper has input voltage of 220 V and ou tput voltage of 660 V. If the conducting time of thyristor chopper is 100 µs, com pute the pulse width of output voltage. In case output voltage pulse width is halv ed for constant frequency operation, find the average value of new voltage
- bAnalyze single phase semi controlled bridge convert er with RLE load and freewheeling diode with the help of circuit diagram and corresponding waveforms
- bA single phase voltage controller has input voltage of 230 V, 50 Hz and a load of R= 15 Ω. For 6 cycle on and 4 cycle off, determine (i) rms output voltage, (ii) input pf and (iii) average and rms thyristor currents
- bWrite short note on various methods of voltage control of a single-phase inverter
Question text is extracted from the official AKTU question paper PDF above. Hindi translations are omitted — every question is printed in English in the original paper. Last verified: 2026-08-23.
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