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EC-604 (C) RGPV B.Tech

POWER ELECTRONICS (PE)

Previous year papers and the official syllabus are free to read, no account needed.

Previous Year Papers

5 papers, latest Jun 2025

Free
See all 5 papers

Syllabus, notes and important questions for EC-604 (C)

Syllabus units

Topics as the official RGPV syllabus lists them.

Unit 1 Power Semiconductor Switches 7 topics
  • Power diodes – basic structure and V‑I characteristics; various types
  • DIACs – basic structure and V‑I characteristics
  • TRIACs – basic structure and V‑I characteristics
  • Power BJT – construction and working principle, quasaturation, primary breakdown, secondary breakdown
  • IGBTs – basic structure and V‑I characteristics
  • Power MOSFETs – basic structure and V‑I characteristics
  • Thyristors – basic structure; static and dynamic characteristics; device specifications and ratings; methods of turning on; gate‑triggering circuit using UJT
Unit 1 notes
Unit 2 Rectifiers 4 topics
  • Thyristor series and parallel operation; methods of turning off; commutation circuits
  • Line‑frequency phase‑controlled rectifiers using SCR
  • Single‑phase rectifiers – half‑wave rectifier with R and RL loads; full‑wave half‑controlled and fully controlled converters with continuous and constant currents; input‑side harmonics and power factor; effect of source inductance
  • Three‑phase rectifiers – half‑wave rectifier with R and RL loads; full‑wave fully controlled converters with continuous and constant currents
Unit 2 notes
Unit 3 Inverters & Cycloconverters 8 topics
  • Single‑phase series, parallel and bridge inverters
  • Single‑phase PWM inverters – basic circuit and operation
  • Single‑phase series resonant inverter
  • Single‑phase bridge inverter
  • Three‑phase bridge inverter
  • Voltage control of inverters
  • Harmonics reduction techniques
  • Single‑phase and three‑phase current‑source inverters
Unit 3 notes
Unit 4 AC Voltage Controllers 5 topics
  • Principle of ON‑OFF and phase control
  • Single‑phase AC voltage controller with resistive and inductive loads
  • Three‑phase AC voltage controllers – various configurations and comparison
  • Single‑phase transformer tap changer
  • Cycloconverters – basic principle of operation; single‑phase to single‑phase; three‑phase to single‑phase; three‑phase to three‑phase; output voltage equation
Unit 4 notes
Unit 5 DC – DC Converters 3 topics
  • Choppers – principle of operation; step‑up and step‑down choppers
  • Switching regulators – buck regulators; boost regulators; buck‑boost regulators
  • Switched‑mode power supply – principle of operation and analysis
Unit 5 notes
Read the full syllabus

Exam insights

Counted from 3 past EC-604 (C) papers.

Marks asked per paper, by unit

  • Unit 1 Power Semiconductor Switches 33 marks
  • Unit 2 Rectifiers 26 marks
  • Unit 3 Inverters & Cycloconverters 19 marks
  • Unit 4 AC Voltage Controllers 21 marks
  • Unit 5 DC - DC Converters 14 marks

Average marks of the questions from each unit in one paper. You answer only some of them, so the total is more than the paper’s maximum.

Asked again and again

  1. Describe the basic circuit, working principle and operation of a single-phase PWM inverter and explain its advantages / performance improvements over traditional inverters.

    Asked 2 times: 2025, 2024

  2. Explain the principles of on-off control and phase control in AC voltage controllers and how they regulate output voltage.

    Asked 2 times: 2025, 2024

  3. Discuss the principle of operation of a single-phase transformer taps changer. How does it control the output voltage in power distribution systems?

    Asked 2 times: 2025, 2024

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