THEORY OF COMPUTATION IT T55 III YEAR

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1 PART A UNIT - I 1. What is meant by finite automata? 2. What is a formal language? 3. What are the two ways of representing an automaton? 4. What is a formal language? 5. What are the two main types of finite automata? 6. Define a language. 7. What is meant by transition? 8. What is regular expression and regular language? 9. What are two- way finite automata? (Nov 14) 10. What is meant by ε -closure? (Nov 16) 11. State the equivalence theorem of NFA and DFA. 12. Define the language accepted by NFA with epsilon moves. 13. Define regular expression. (Nov 14) 14. Write down the rules for defining regular expression. 15. What are the difference between NFA and DFA? (Nov 13) 16. Write down the operations of the regular expression. 17. State some applications of regular expression. 18. What are the two types of finite automata with output?(nov 16) 19. State the difference between Mealy and Moore machine. (Nov 16) 20. State the characteristics of automata. (Nov 16) 21. Construct a DFA with for all the set of strings with {0, 1} that has even number of 0 s and 1 s. 22. Draw the block diagram of finite automata? 23. Explain the six tuples in a mealy and a Moore machines? 24. Explain finite automata with -moves? 25. Define the rules for transition diagram? 26. What are the applications of automata theory?(nov 13) 27. Define Finite Automaton(FA) (Apr 15) 28. What is meant by token? (Apr 15) 29. What is meant by minimization of DFA? 30. Show the (r*)*=r* for a regular expression (Nov 13) PART B 1. Explain the equivalence of NFA and DFA with examples. (Nov 16) 2. Discuss the importance of Epsilon transitions with examples. (Nov 16) 3. Design a DFA to accept the language. L = {w w has both an even number of 0 s and an even number of 1 s} 4. Prove that a language L is accepted by some DFA if and only if L is accepted by some DFA. 5. Distinguish between DFA and NFA. Give a formal definition of finite automata. (Nov 16) J. Veerendeswari, AP/IT. Page 1

2 6. Construct a DFA that accepts those strings over {a, b} which begin with an a followed by b n (n >= 0). 7. For the following NFA, find the equivalent DFA. (Nov 16) 0 1 q o {q0, q1} {q0} q1 {q2} {q2} q2 {q3} {q3} q3 Ø Ø 8. Write short notes on Moore and Melay machine. (Nov 16)(Nov 14)(Apr 15) 9. Discuss finite automata with output. (Apr 15) UNIT II 1. Define context free grammar. (Nov 13) 2. When is a grammar said to be ambiguous? (Nov 13) 3. Write the principal closure properties for regular language?(nov 13) 4. What is regular set?(nov 14) 5. Define the term Production. Give an example. (Nov 14) 6. Describe the application of regular expressions. (Nov 16) 7. What is meant by leftmost derivation and rightmost derivation? 8. Write about sentential form? 9. What are the applications of context free language? 10. What is meant by unambiguous? 11. What is meant by ambiguous grammar? (Nov 16) (Nov 13)(Apr 15) 12. Describe the applications of regular expressions. (Nov 16) 13. What is BNF?(Apr 15) 14. State Chomsky normal form? 15. State Greibach normal form? 16. What are the properties of the CFL generated by a CFG? 17. What are the three ways to simplify a context free grammar? 18. Find the grammar for the language L={ a 2n bc, where n>1 } 19. Find the language generated by :S 0S1 0A 0 1B 1 ; A 0A 0; B 1B Differentiate sentences Vs sentential forms 21. What is derivation tree? 22. Draw derivation tree for a+a*a. 23. Define pumping lemma for regular language. (Nov 16) 24. What is handle pruning? 25. State pumping lemma for context free language. (Nov 16) J. Veerendeswari, AP/IT. Page 2

3 PART - B 1. What is a derivation tree? Construct derivation trees for the word ababbbba using the grammars G consists of the products {S AbS, A as, S ba and A b} 2. Prove that every language defined regular expression is also accepted by a finite automaton. 3. Construct a DFA with reduced state equivalent to the Regular Expression RE = 10 + (0 + 11) 0 * Briefly explain with Pumping Lemma for Regular sets. (Nov 16) 5. Find the languages generated by the following grammar: G = {(S, A, B), (a, b), S, P} where P is the set of production {S AB, S AA, A ab, A ab, B > b} 6. What is Chomsky Normal form? How grammar can be put in CNF? Illustrate. (Nov 14) 7. Write a context free grammar for the language L = {a n ba n n>=1} (Nov 13) 8. Find the Chomsky normal form for the following grammar G = ({S,A,B},{a,b}P,S) P: S ba ab, A baa+ as a, B abb bs\b. (Nov 13) 9. Convert the following grammar to Greibach normal form G = ({A1,A2,A3}, {a,b}, P1A1), where p consists of the following: A1 A2,A3, A2 A3A1 b, A3 A1A2 (Apr 15) 10. Describe the top down parsing. (Nov 13) 11. Show that {0 i 1 j gcd(i,j)=1}is not regular.(apr 15) 12. Convert the following CFG to Chomsky Normal Form S AA, A BB, B abb/b/bb. 13. Discuss the normal forms for context-free grammars. (Nov 16) 14. State and prove pumping lemma for CFL. (Nov 16) UNIT III 1. What are the special features of Turing Machine?(Nov 13) 2. When is checking off symbols used in Turing Machine?(Nov 13) 3. State the notations for Turing machine. 4. What is Nondeterministic Turing Machine?(Nov 14) 5. What are (a) recursively enumerable languages (b) recursive sets? (Nov 16) 6. Write the cncepts of Universal Turing Machine.(Nov 15) 7. When do you say that a Turing Machine accepts a string?(nov 15) 8. What is the difference between the Turing machine and the Finite automata? 9. What are the components of Turing machine?(apr 16) 10. What are the elements of a Turing Machine? (Apr 16) 11. Who invented Turing Machine? (Nov 16) 12. How many tuples are in the Turing machine? What are they? 13. What are the different types of Turing machine? 14. What is multiple Turing machine?(apr 15)(Apr 16) J. Veerendeswari, AP/IT. Page 3

4 15. What is Turing machine with multiple tapes? 16. What is Turing machine with infinite tape? 17. What is a recursive algorithm? 18. What is recursive enumerable language? (Nov 16) 19. What is the difference between Semi-infinite and two way infinite tapes? 20. Write about the storage in the Finite control? 21. Write about shifting over in the Turing machine? 22. What is a Turing machine? 23. Define Instantaneous description of TM. 24. What are the applications of TM? 25. What is the basic difference between 2-way FA and TM? 26. What are the techniques for Turing machine construction? 27. Differentiate PDA and TM. 28. What is Church s Hypothesis?(Apr 16) 29. What is a multidimensional TM? PART - B 1. With a proper diagram, briefly explain the working of a Turing Machine.(Nov 14)(Nov 15) 2. Explain the method of constructing Turing Machine. (Nov 16) 3. Explain briefly the Church Thesis.(Apr 16)(Nov 15) 4. Design a Turing machine to accept language {a n b n n>=1}(nov 15) 5. Prove that every language accepted by a multiple Turing Machine is recursively Enumerable. (Nov 15) 6. Briefly explain with programming techniques of turing machines. 7. What is Turing Machine? Explain version (Types) in Turing Machine. (Nov 16)(Nov 13)(Apr 16) 8. Design a turing Machine M to perform proper subtraction. (Nov 13) 9. Consider the TM described by the transition table. Describe the processing of (a) 011, (b)0011, (c)001. Which of the above strings are accepted by M? Present State Tape Symbols 0 1 x y B q1 xrq2 BRq5 q2 0Rq2 ylq3 yrq2 q3 0Lq4 xrq5 ylq3 q4 0Lq4 xrq1 q5 yrq5 BRq6 q6 10. Design a Turing machine M to recognize the language. L = {1 n 2 n 3 n : n>=1} J. Veerendeswari, AP/IT. Page 4

5 11. Construct a Turing Machine to accept the set L of all strings over {0, 1} ending with 010. (Nov 16) 12. Explain the Turing Machine model with a suitable example.(nov 14) 13. Discuss modification of turing machines.(apr 15) 14. Write a note on variations of TM. (Apr 15) UNIT IV 1. What is Push down automata?(apr 16) 2. Define Push down automata.( Apr 16) 3. Define NPDA. (Apr 16) 3. Explain the transition mapping of PDA. 4. Why there is a need for stack in PDA? 5. What is the Equivalence of PDA s and CFG s. (Nov 16) 6. Compare NFA and PDA. 7. Specify the two types of moves in PDA? 8. What are the two ways by which a language is accepted by PDA? (Nov 15) 9. What is the relationship between Deterministic Push Down Automata and Context Free Languages? (Nov 15) 10. What are the different types of language acceptances by a PDA. 11. Define acceptance by final state. 12. Define acceptance by empty stack. 13. Define Instantaneous description in PDA. 14. What are the components of Pushdown Automata? 15. Compare NPDA and DPDA. PART B 1. Define Push Down Automata (PDA) and give moves of the PDA that accepts {wcw R w (0+!)* by empty stack. (Nov 15) 2. Design a PDA to accept the language L = {a i b j c k : i+j = k; i>=0, j>=0} (Nov 15) 3. Explain the closure properties of CFL. (Nov 15)(Apr 16)(Nov 13) 4. Show that, if L is a Context Free language, then there exists a PDA M such that L = N(M). (Nov 13) 5. Discuss the equivalence of PDA s and CFL s. (Nov 16)(Apr 16) 6. Describe the importance of deterministic push down automata. (Nov 16) J. Veerendeswari, AP/IT. Page 5

6 7. Write a detailed note on deterministic PDA. (Nov 14) 8. Define PDA with seven tuples. Explain in detail and input string is L = {ababbcbbaba}. 9. Explain detail about Decision Algorithms for CFL s. UNIT V 1. Define Top-down parsing? (Nov 16) 2. Define Bottom-up parsing? (Nov 16)(Nov 15) 3. Define handle and handle pruning? (Apr 16) 4. What is a reduction? (Apr 16) 5. Define parser table. (Nov 15) 6. What is the concept of stack? (Nov 14) 7. Use Top down parsing to parse aaab using the following grammar. S AB, A aa/?, B b/bb (Apr 15) 8. Explain the actions used in Bottom up parsing. 9. Distinguish between top-down and bottom-up parsing. (Nov 16) 10. State decision algorithm 11. State the relationship between derivation and derivation tree. 12. How to eliminate the left recursive patterns? 13. List the properties of LR parser. 14. Mention the types of LR parser. 15. What are the problems with top down parsing? 16. Write the algorithm for FIRST and FOLLOW. 17. Write short notes on YACC. 18. Define LR(0) items. 19. What is meant by viable prefixes? PART - B 1. Describe function of SLR parser and its limitations. (Nov 15) 2. How will you construct the parsing table for LALR parser? Explain the procedure with example. (Nov 15) 3. Write in detail about LALR parsing algorithm. (Nov 13) 4. Explain the working of CFG and PDA with suitable example. (Apr 16) 5. How will you construct the parsing table for LALR parser? Explain the procedure with example. 6. Consider the grammar E TE, E +TE /ε, T FT, T *FT / ε, (E) / id. To construct the predictive parser method. Input string is id + id * id. 7. What is shift reduce parsing? Give example. And stack implementation of Shift reduce parsing. J. Veerendeswari, AP/IT. Page 6

7 8. Explain the construction of top-down parser with an example. (Nov 16) 9. Elaborate on the properties of LR(K) grammars. (Nov 16) 10. Consider the grammar E E+T/T, T T*F/F, F (E)/id. To construct the SLR Parsing table. 11. Consider the grammar S CC, C cc/d. To construct the sets of LR(1) items. 12. Explain the working of the LALR parser with suitable examples. (Apr 16) 13. Explain the construction of top-down parser with an example. (Nov 16) 14. Construct CLR parsing table form S AA, A Aa b. (Nov 13) J. Veerendeswari, AP/IT. Page 7

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