RTU Kota B.Tech AI 3rd Semester Digital Electronics Question Paper 2025

RTU Artificial Intelligence Digital Electronics 2025 Paper Review

Preparing for the Rajasthan Technical University B.Tech Digital Electronics exam requires a deep understanding of boolean logic and circuit design. For students in the Artificial Intelligence branch, this subject is the hardware foundation of your entire field. Before you can design complex neural networks or program machine learning algorithms, you must understand how edge AI devices, processors, and memory registers process binary data at the physical level. The 2025 paper tests your ability to minimize logical expressions, design efficient data-routing circuits, and understand memory storage. Reviewing this specific branch paper shows you exactly how examiners structure the questions and allocate marks among the hardware modules. This preparation allows you to approach your third-semester exam confidently.

Understanding the AI Branch Exam Pattern

The RTU theory examination is a three-hour paper worth 70 marks. The paper consists of three distinct sections tailored to test both your quick recall and your circuit design capabilities.

• Part A: This section contains ten compulsory questions worth two marks each. You must write short definitions, perform basic base conversions like hexadecimal to binary, or draw the symbol and truth table for specific logic gates under 30 words.
• Part B: You will find seven questions here. You must answer five of them. Each question is worth four marks. Your answers require solving 3-variable or 4-variable Karnaugh Maps, explaining the working of specific flip-flops, or drawing moderate-sized circuit diagrams.
• Part C: This section offers five major questions. You need to answer three. Each question carries ten marks. These require complete start-to-finish designs of complex circuits, such as synchronous counters, multiplexer trees, or detailed explanations of Analog-to-Digital converter architectures.

Core Topics Evaluated in the AI Paper

The 2025 question paper covers several critical modules that form the baseline of hardware logic. Focus your study time on these specific areas to maximize your score.

Number Systems and Boolean Algebra

This is the foundational language of AI hardware. You must master base conversions involving binary, octal, decimal, and hexadecimal numbers alongside binary arithmetic using 1’s and 2’s complement methods. Examiners heavily test your ability to simplify complex Boolean expressions using De Morgan's theorems. The most critical part of this module is the Karnaugh Map. You will face a ten-mark question asking you to minimize a Boolean function using a 4-variable K-map and realize the simplified expression using universal gates like NAND or NOR.

Combinational Logic Circuits

Combinational circuits are the decision-making pathways of a processor. You must practice drawing the logic diagrams and truth tables for half adders, full adders, half subtractors, and full subtractors. Study how multiplexers act as data selectors and demultiplexers act as data distributors. Examiners frequently ask you to implement a given Boolean function using a specific multiplexer like an 8:1 MUX. You also need to understand the design of encoders and decoders, which are vital for memory addressing in AI chips.

Sequential Logic Circuits

Unlike combinational circuits, sequential circuits have memory, which is a crucial concept for AI state machines. You must thoroughly understand the construction, truth table, and excitation table for SR, JK, D, and T flip-flops. Expect questions asking you to convert one type of flip-flop into another, such as converting a JK flip-flop to a D flip-flop. Practice designing synchronous and asynchronous ripple counters. You must be able to design a Mod-N counter or a ring counter and draw the timing diagrams accurately. Shift registers are also a major topic, especially Serial-In-Parallel-Out and Parallel-In-Serial-Out configurations.

Logic Families and Semiconductor Memories

You need to understand the physical constraints of digital chips. Study the characteristics of logic families like Transistor-Transistor Logic and Complementary Metal-Oxide-Semiconductor. Be ready to define terms like propagation delay, fan-in, fan-out, and noise margin. For the memory section, understand the differences between SRAM and DRAM, and the architecture of ROM, PROM, EPROM, and EEPROM.

A/D and D/A Converters

For AI engineers, this module is highly practical. AI systems rely on sensors that collect continuous analog data, which must be converted to digital formats for a system to process. You must explain the working principles of Digital-to-Analog Converters using the R-2R ladder network and Analog-to-Digital Converters like the Successive Approximation ADC and Flash ADC. Expect questions asking you to calculate the resolution or step size for an n-bit converter.

Answer Writing Strategy for High Marks

RTU evaluators look for neat logical flow, precise truth tables, and clearly labeled circuit diagrams in your answer booklet. Use a blue pen for your explanatory text and a black pen for drawing logic gates and K-maps.

In Part A, answer directly. If the question asks for the truth table of an XOR gate, draw the 2-input table clearly without writing a long paragraph. Keep your answers factual and precise.

In Part B, show your working clearly. When solving a K-map, clearly circle your pairs, quads, and octets. Write the logical expression derived from each grouping before writing the final simplified equation.

In Part C, detail is essential. When designing a sequential circuit for a ten-mark question, use a standard four-step format: draw the state diagram, write the state table, solve the K-maps for the flip-flop inputs, and draw the final logic circuit diagram clearly. The university marking system rewards clear logic diagrams. Draw a prominent box around your final Boolean equations to make them visible to the examiner.

Time Management During the Exam

Allocate 20 minutes to Part A. Spend 40 minutes on Part B. Reserve the remaining 120 minutes for the three long-answer questions in Part C. Drawing complex synchronous counters, multiplexer trees, or step-by-step successive approximation ADC diagrams takes significant time. This structure gives you 40 minutes per major question, allowing you to double-check your K-map groupings and verify your logic gate connections. Use the final 10 minutes to verify your truth tables, ensure you have not missed any inversion bubbles on your logic gates, and check that all inputs and outputs are properly labeled.