Q.1
14 Marks(a)
Define the term: (i) holding current (ii) latching current.
(b)
Explain construction and static characteristics of IGBT.
(c)
Draw and explain the resistance triggering and R-C triggering circuits for turning on SCR.
Gujarat Technological UniversitySummer 2026 examination
GTU BE04009031 Power Electronics Summer 2026 Question Paper & PDF
B.E. · Electrical Engineering · Semester 4 · Subject code BE04009031
- Total
- 70 marks
- To pass
- 23 marks (33%)
- Duration
- 2.5 Hours 10:30 AM – 1:00 PM
- Questions
- 5 with internal choice
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Q.2
14 Marks(a)
What is pulse width modulation? List the various PWM techniques.
(b)
Write a short note on (i) SiC devices (ii) GaN devices
(c)
Draw circuit diagram and necessary waveforms of single phase fully controlled center-tapped ac to dc converter with R load. Derive equation for VRMS.
OR
(c)
Explain three phase inverter with mode of conduction with circuit and waveform.
Q.3
14 Marks(a)
Explain the effect of firing angle on output voltage.
(b)
Derive output voltage equation for single phase half wave rectifier.
(c)
Describe three adverse effects of electromagnetic interference. Discuss briefly one remedial step to reduce EMI.
OR
(a)
Write significance of freewheeling diode in control rectifier with necessary circuit diagram and waveforms.
(b)
Describe the SPWM control technique in detail.
(c)
Explain working of 3- A.C. voltage controller with star connected R load using circuit diagram and waveforms of input phase voltages, triggering waveforms and output R phase voltage for .
Q.4
14 Marks(a)
What is on-off control in AC regulators?
(b)
Classify different techniques for voltage control of inverter. Explain anyone.
(c)
Explain the working principal of buck-boost converter with circuit diagram of different modes of operation.
OR
(a)
Discuss the operation of DC/DC Flyback converter.
(b)
Explain TRC and CLC control strategies with respect to DC-DC converters.
(c)
Show that the fundamental rms value of per-phase output voltage of low frequency for an m pulse cyclo-converter is given by
Q.5
14 Marks(a)
Define the term Harmonics, its causes and effects.
(b)
Give comparison between on-off control and phase angle control.
(c)
Explain applications of power electronics in EV Systems.
OR
(a)
Explain UJT relaxation oscillator circuit.
(b)
What is a cycloconverter? Enumerate some of its industrial applications.
(c)
Explain HVDC transmission using converters.
Other Semester 4 subjects
BE Electrical
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About this paper
Official Gujarat Technological University (GTU) examination paper for Power Electronics (Summer 2026, B.E. · Electrical Engineering, Sem 4). Features complete 70-mark regular & remedial examination pattern, official marking distribution across all 5 questions, and direct 1-click official PDF download.
Transcribed for student exam preparation from Gujarat Technological University official examination archives. Questions, syllabus guidelines, and curriculum marking schemes remain the intellectual property of Gujarat Technological University.