IT-305 RGPV B.Tech
Digital Circuits and Systems (DCS)
Previous year papers and the official syllabus are free to read, no account needed.
Previous Year Papers
4 papers, latest Dec 2025
Syllabus, notes and important questions for IT-305
Syllabus units
Topics as the official RGPV syllabus lists them.
Unit 1 Number systems and logic gates 8 topics
- Decimal, Binary, Octal, Hexadecimal number systems and radix conversion
- BCD, Excess‑3, Gray, ASCII codes
- Boolean algebra theorems and properties
- Boolean functions
- Canonical and standard forms
- De Morgan's theorem
- Digital logic gates
- Karnaugh maps
Unit 2 Combinational circuits 9 topics
- Introduction to combinational circuits
- Multilevel NAND implementation
- Multilevel NOR implementation
- Design of binary adders
- Design of binary subtractors
- Decoder circuits
- Encoder circuits
- Multiplexer circuits
- Demultiplexer circuits
Unit 3 Sequential circuits 9 topics
- Introduction to sequential circuits
- Flip‑flops: RS, D, T, JK, Master/Slave JK flip‑flops
- Truth tables of flip‑flops
- Excitation tables and characteristic equations
- Clocked and edge‑triggered flip‑flops
- Registers: definition, serial registers, parallel registers, shift left/right registers
- Johnson counter
- Asynchronous counters
- Synchronous counters
Unit 4 Digital logic families 10 topics
- Bipolar and unipolar logic families
- Digital IC specifications
- RTL (Resistor‑Transistor Logic)
- DTL (Diode‑Transistor Logic)
- TTL (Transistor‑Transistor Logic) types
- ECL (Emitter‑Coupled Logic)
- IIL (Integrated Injection Logic)
- PMOS logic
- NMOS logic
- CMOS logic
Unit 5 Clocks and timing circuits 9 topics
- Bistable multivibrator
- Monostable multivibrator
- Astable multivibrator
- Schmitt trigger circuit
- Introduction to analog‑to‑digital converters (ADC)
- Introduction to digital‑to‑analog converters (DAC)
- Display devices: 7‑segment LED display
- Display devices: 16‑segment LED display
- LCD display
Exam insights
Counted from 4 past IT-305 papers.
Marks asked per paper, by unit
-
Unit 1 Number systems and logic gates 28 marks
-
Unit 2 Combinational circuits 26 marks
-
Unit 3 Sequential circuits 23 marks
-
Unit 4 Digital logic families 16 marks
-
Unit 5 Clocks and timing circuits 16 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
-
Convert numbers (including fractional parts) between indicated bases among binary, octal, decimal, hexadecimal, other bases and BCD
Asked 8 times: 2025, 2024, 2023, 2020, 2019, 2018
-
Minimize / find minimal SOP for a Boolean function using K-map method.
Asked 4 times: 2024, 2023, 2019
-
List the various types of Analog to Digital (A/D) converters and explain any one of them in detail, with sketch where required.
Asked 3 times: 2025, 2024, 2020