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Thread: CS402 Theory of Automata Mid Term paper spring 2011

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    Word Icon 35px Jpg.ashx CS402 Theory of Automata Mid Term paper spring 2011

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    CS402 Theory of Automata
    Mid Term Examination Spring 2006
    Question No. 1 Marks : 1
    If s=abcd is a string defined over . = {a,bc,d} then reverse of s is dcba.
    True
    False
    Question No. 2 Marks : 10
    Find the regular expression associated to the following FA. Show all steps.
    [Hint: use FA to GTG and GTG to RE.]
    Question No. 3 Marks : 1
    . = {aa, b}, length(aaaabaabb) = 5.
    True
    False
    Question No. 4 Marks : 1
    Every NFA can be converted into FA.
    True
    False
    Question No. 5 Marks : 1
    There can be more than one start states in TG.
    True
    False
    Question No. 6 Marks : 1
    A regular language can not be infinite.
    True
    False
    Question No. 7 Marks : 10
    a) Write the recursive definition of the following language. [6]
    L = Defining the language {a2n b4n }, n=1,2,3, , of strings defined over ={a, b}
    b) Write a regular expression of the language having strings that either start or end with
    00 and have no more zeroes. Where the alphabet is {0, 1}. [4]
    Question No. 8 Marks : 1
    Kleene star of {1} generates {1, 11, 111, 1111, 11111 }.
    True
    False
    Question No. 9 Marks : 10
    a) Define NFA-null. [4]
    b) Draw DFA for the following NFA. [6]
    Question No. 10 Marks : 1
    If a regular language is empty then we denote it like L = . (fi).
    True
    False
    Question No. 11 Marks : 1
    Recursive method for defining language is only for regular languages.
    True
    False
    Question No. 12 Marks : 1
    aa* = a+ ?
    True
    False
    Question No. 13 Marks : 1
    The language equal means number of as and bs are equal with null string.
    True
    False

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