UGC NET DEC 2026 | CS | Unit 2:Computer System Architecture | Encoder & Decoder | Class 9

In this Class 9 of the UGC NET Computer Science (Unit 2: Computer System Architecture) series, we explore Encoders and Decoders, two important combinational logic circuits that are frequently tested in the UGC NET Computer Science, GATE, SET, and university examinations.

This session begins with the fundamentals of Encoders, explaining how they convert multiple input lines into a compact binary code. We discuss the 4-to-2 Encoder, Decimal-to-BCD Encoder, and Priority Encoder, along with their truth tables, logic diagrams, advantages, disadvantages, and practical applications such as keyboards, interrupt handling, and digital communication systems.

The lecture then covers Decoders, which perform the reverse operation by converting binary inputs into unique output lines. You will learn about 2-to-4, 3-to-8, and 4-to-16 Decoders, enable inputs, truth tables, logic circuits, and applications in memory address decoding, chip selection, seven-segment displays, and digital systems.

Additionally, this class compares Encoder vs Decoder, highlights common UGC NET PYQs, expected examination questions, shortcut techniques, and memory tricks to solve multiple-choice questions quickly. By the end of this session, you will have a clear conceptual understanding and be well-prepared for competitive examinations.

📌 Topics Covered:

Introduction to Encoder
Working Principle of Encoder
4-to-2 Encoder
Decimal-to-BCD Encoder
Priority Encoder
Introduction to Decoder
Working Principle of Decoder
2-to-4 Decoder
3-to-8 Decoder
4-to-16 Decoder
Enable Input in Decoder
Encoder vs Decoder
Applications of Encoder & Decoder
Truth Tables and Logic Diagrams
UGC NET Previous Year Questions (PYQs)
Expected MCQs for UGC NET December 2026

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