EC-604 (C) · POWER ELECTRONICS/Unsolved PYQ Paper
EC-604 (C) Power Electronics - Nov 2023 Question Paper
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Unit 17 MarksaExplain the two transistor analogy of SCR with equivalent circuit and give three applications.
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Unit 17 MarksbExplain the operation of IGBT with V‑I and switching characteristics.
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Unit 17 MarksaDraw and explain the necessity of static and dynamic equalizing circuit for series connected SCR'S? Derive relations used for determining the values of shunt resistor R and capacitor C in this circuit.
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Unit 27 MarksbDerive the output voltage and current expressions for firing angle of 45 degrees.
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Unit 27 MarksaExplain the operation of single phase fully controlled converter with R-L load.
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Unit 27 MarksbExplain the effect of source impedance on the performance of single phase fully controlled bridge converter.
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Unit 23 MarksiA three phase fully controlled bridge converter is connected to three phase ac supply of 400V, 50Hz and operates with a firing angle $\alpha = \frac{\pi}{4}$. The load current is maintained constant at 10A and the load voltage is 360V, compute: Source inductance Ls.
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Unit 22 MarksiiA three phase fully controlled bridge converter is connected to three phase ac supply of 400V, 50Hz and operates with a firing angle $\alpha = \frac{\pi}{4}$. The load current is maintained constant at 10A and the load voltage is 360V, compute: Load resistance R.
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Unit 22 MarksiiiA three phase fully controlled bridge converter is connected to three phase ac supply of 400V, 50Hz and operates with a firing angle $\alpha = \frac{\pi}{4}$. The load current is maintained constant at 10A and the load voltage is 360V, compute: Overlap angle, \mu.
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Unit 37 MarksbExplain the operation of single pulse modulation of inverter with neat diagram.
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Unit 37 MarksaDescribe the operation of 3-phase bridge inverter circuit diagram with resistive load in 120\degree conduction mode.
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Unit 37 Marksb3-phase bridge inverter is fed from a d.c. source of 200 V. If the load is star-connected of 10\Omega/phase resistance, Estimate the RMS load current and load power (in watt) if it is operated in 120\degree conduction mode.
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Unit 44 MarksiWrite short notes on: Jones chopper.
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Unit 43 MarksiiWrite short notes on: Current limit control of dc-dc converter.
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Unit 47 MarksbA dc on-off chopper operating at 1 kHz and duty cycle of 10% is supplied from a 200V source. If the load inductance is 10 mH and resistance 10\Omega. Compute the maximum and minimum circuit in the load.
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Unit 57 MarksaDerive an expression for rms value of output voltage of single phase bridge type ac voltage controller.
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Unit 57 MarksbDraw the circuit of single phase voltage controller with anti-parallel connection of two thyristors and an R-L load. Explain its working. Sketch load voltage and load current waveforms. Derive an expression for output voltage.
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Unit 55 MarksaWrite short notes on: AC voltage controllers.
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Unit 35 MarksbWrite short notes on: Harmonics and their reduction.
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Unit 15 MarkscWrite short notes on: GTO and its V-I characteristics.
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Unit 15 MarksdWrite short notes on: Forced commutation technique of thyristor.
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