EX-504 (A) RGPV B.Tech
Industrial Electronics (IE)
Previous year papers and the official syllabus are free to read, no account needed.
Previous Year Papers
3 papers, latest Jun 2025
Syllabus, notes and important questions for EX-504 (A)
Syllabus units
Topics as the official RGPV syllabus lists them.
Unit 1 Power Supply and Rectifiers 10 topics
- Power supply basics
- Half‑wave and full‑wave rectifiers
- Performance parameters of power supplies
- Filters: capacitor, inductor, LC, and π configurations
- Bleeder resistor
- Voltage multipliers
- Regulated power supplies: series and shunt voltage regulators, fixed and adjustable voltage regulators, current regulator
- Switched regulator (SMPS)
- Comparison of linear and switched power supplies
- Switch‑mode converters: flyback, buck, boost, buck‑boost, Cuk converters
Unit 2 Silicon Controlled Rectifiers (SCR) and Line‑Commutated Converters 12 topics
- Constructional features of SCRs
- Principle of operation of SCRs
- SCR terminology
- Turn‑on methods for SCRs
- Turn‑off methods for SCRs
- Triggering methods of SCR circuits
- Types of commutation in SCRs
- Comparison of thyristors and transistors
- Thermal characteristics of SCRs
- Causes of damage to SCRs
- SCR over‑voltage protection circuits
- Line‑commutated converters: half‑wave rectifier with inductive and resistive load, single‑phase and three‑phase full‑wave rectifiers
Unit 3 SCR Family Devices and Power Semiconductor Devices 9 topics
- Triacs, Diacs and Quadracs (members of the SCR family)
- Recovery characteristics of SCR‑family devices
- Fast‑recovery diodes
- Power diodes
- Power transistors
- Power MOSFETs
- Insulated‑gate bipolar transistors (IGBTs)
- Loss mechanisms in semiconductor devices
- Comparison between power MOSFETs, power transistors and power IGBTs
Unit 4 Operational Amplifier Applications 10 topics
- Basics of operational amplifiers (OP‑AMP)
- Relaxation oscillator using OP‑AMP
- Window comparator circuits
- OP‑AMP as rectangular‑to‑triangular pulse converter and vice versa
- Wien‑bridge oscillator
- Function generator circuits
- Frequency response of OP‑AMPs
- Simplified OP‑AMP circuit diagrams
- Power supply designs using OP‑AMPs
- Filters implemented with OP‑AMPs: low‑pass and high‑pass configurations
Unit 5 Programmable Logic Controllers (PLC) 14 topics
- Functions and applications of PLCs
- Advantages and disadvantages of PLCs over conventional relay controllers
- Comparison of PLCs with process‑control computer systems
- Factors to consider when selecting a PLC
- Functional block diagram of a PLC
- Microprocessor architecture in PLCs
- Memory organization in PLCs
- Input and output modules (interface cards)
- Sequence of operations in a PLC
- PLC status monitoring
- Event‑driven device handling
- Ladder logic programming language
- Simple process‑control applications of PLCs
- Programming examples for PLCs
Exam insights
Counted from 3 past EX-504 (A) papers.
Marks asked per paper, by unit
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Unit 1 Power supply, rectifiers and regulators 23 marks
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Unit 2 Silicon controlled rectifiers (SCR) and Converters 23 marks
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Unit 3 Other members of SCR family 14 marks
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Unit 4 Applications of OP-AMP 19 marks
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Unit 5 Programmable Logic Controller (PLC) 26 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
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Explain principle of operation, transistor model, features and V-I characteristics of IGBT
Asked 3 times: 2025, 2024
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Explain the functional block diagram of a PLC and its use with microprocessor.
Asked 3 times: 2024, 2020
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Draw the V-I characteristics of an SCR and mark the holding current and latching current.
Asked 3 times: 2025, 2020