Theory of Automata Past Paper Solved | BSCS | Detailed Explanation & Diagrams | 100% Exam Prep

Описание: Welcome to this complete and exam-focused video on Theory of Automata (TOA) Past Paper Solutions for BS Computer Science (BSCS) students at Punjab University (PU). This video is specifically created to help students score maximum marks in TOA by understanding the logic, diagrams, and step-by-step answers for past exam questions.

If you're preparing for your final term, supply, or regular semester exam, this video is your ultimate guide. All questions are explained in a clear, easy-to-understand way with proper diagrams, tables, state transitions, and theoretical reasoning — exactly as required by Punjab University examiners.

📘 Course Title: Theory of Automata
📚 University: Punjab University, Lahore
📄 Paper Code: Most commonly UE-242 / CS-242 /DC-222
🧠 Semester: 4th Semester (BSCS)
⏳ Duration Covered: Past Papers from 2020–2024

📚 Topics Covered in This Video:
✅ 1. Introduction to Automata

What is an automaton?

Basic definitions: Language, Alphabet, String, Symbols

Types of automata (Finite, Pushdown, Turing)

✅ 2. Deterministic Finite Automata (DFA)

Design DFA for strings with specific conditions

State diagrams and transition tables

Practice examples with dry runs

PU-style long questions fully solved

✅ 3. Non-Deterministic Finite Automata (NFA)

Difference between NFA and DFA

Convert NFA to DFA (with full steps)

PU past questions solved

✅ 4. Epsilon-NFA (ε-NFA)

Transition with epsilon (ε)

Removing ε-transitions

Equivalent DFA conversion

✅ 5. Regular Expressions & Languages

Convert RE to NFA

RE for even number of 0s or 1s

Construct RE from FA

✅ 6. Finite Automata with Output

Mealy Machine and Moore Machine

Differences with examples

Convert Mealy to Moore (step-by-step)

✅ 7. Pumping Lemma

Definition and explanation

Proving language is not regular using Pumping Lemma

Punjab University solved questions

✅ 8. Context-Free Grammar (CFG)

Design CFG for given languages

Derivation and parse trees

Leftmost and rightmost derivation

✅ 9. Pushdown Automata (PDA)

Stack-based automata

Accept language by empty stack and final state

Solved PDA design questions from past papers

✅ 10. Turing Machine (TM)

Concept of Turing Machine

Designing a TM for simple problems

Decidable vs Undecidable problems

Short and long question answers

✅ 11. Chomsky Hierarchy

Types 0 to 3 grammars

Language classifications

Regular, context-free, context-sensitive, recursively enumerable

✅ 12. Important Definitions and Theoretical Questions

Finite vs Infinite Automata

Language Recognition

Memory usage in models

Closure properties

📜 Solved PU Past Paper Questions Include:
Design a DFA that accepts strings over {0,1} with even number of 1s

Convert given NFA to DFA

Write a regular expression for language containing substring “01”

Design a Mealy machine that outputs ‘1’ for every two 1s read

Prove language is not regular using Pumping Lemma

Convert CFG to CNF and GNF

Explain Turing Machine and design one for palindrome recognition

Differentiate between Moore and Mealy machine with example

Explain CNF with example and steps

Define and explain Chomsky Hierarchy

Design PDA for L = {a^n b^n | n ≥ 0}

🔎 Why This Video is Important for PU Students?
All questions are selected from real PU exams

Includes keywords & structure examiners expect

Uses standard diagrams and clean formatting

Ideal for self-study and revision before exams

Designed to help you score 80%+ marks easily
📚 Recommended for:
Punjab University BSCS 4th Semester students

GCU, UCP, UET, BZU students using similar TOA syllabi

Students preparing for competitive exams like GAT/NTS/FAST Entry

Anyone learning automata theory for interview or academic project

📌 Final Words:
This video is not just a solution set — it’s a complete walkthrough of automata theory from an exam perspective. It helps you understand, memorize, and write perfect answers as expected in PU's official exams.

Whether you're weak in theory, afraid of diagrams, or need help converting expressions — this tutorial has it all.

📢 Don’t forget to:
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✅ Share with your friends and batchmates
✅ Download handwritten notes & slides from the link in comments

🔖 #TheoryOfAutomata #PUPastPaper #BSCS #LaibaZahoor #PunjabUniversity #DFA #NFA #CFG #TuringMachine #AutomataLecture #MealyMachine #MooreMachine #TOAPreparation #CNF #GNF #ChomskyHierarchy #PUExam2025Welcome to this complete and exam-focused video on Theory of Automata (TOA) Past Paper Solutions for BS Computer Science (BSCS) students at Punjab University (PU). This video is specifically created to help students score maximum marks in TOA by understanding the logic, diagrams, and step-by-step answers for past exam questions.