Q. The length of the shortest string NOT in the language (over Σ = {a, b}) of the following regular expression is _____________
a*b*(ba)*a*

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Q. How many minimum states are required to find whether a string has odd number of 0’s or not

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Q. Consider alphabet ∑ = {0, 1}, the null/empty string λ and the sets of strings X0, X1 and X0.How are X1 and X2 are related ?
X0 = 1 X1

X1 = 0 X1 + 1 X2

X2 = 0 X1 + {λ}

Which one of the following represents the strings in X0?

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Q. Which of the following languages is/are regular?
L1: {wxwR ⎪ w, x ∈ {a, b}* and ⎪w⎪, ⎪x⎪ >0} wR is the reverse of string w

L2: {anbm ⎪m ≠ n and m, n≥0

L3: {apbqcr ⎪ p, q, r ≥ 0}

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Q. The set of all strings over ∑ = {a,b} in which strings consisting a’s and b’s and ending with in bb is

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Q. An individual token is called ________

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Q. Lexical Analyser’s Output is given to Syntax Analysis.

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Q. Lexical Analysis Identifies Different Lexical Units in a _______

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Q. Which one is a type of Lexeme

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Q. The process of forming tokens from an input stream of characters is called_____

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Q. When expression sum=3+2 is tokenized then what is the token category of 3

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Q. Which grammar defines Lexical Syntax

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Q. It has encoded within it information on the possible sequences of characters that can be contained within any of the tokens it handles .Above motioned function is performed by?

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Q. Lexers are often generated by a lexer generator, same as parser generators,

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Q. Which one is a lexer Generator

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Q. Which of the lexical analyser can handle Unicode

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Q. Which NDFA correctly represents the following RE :

a(bab)*∪a(ba)*

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Q. Which is the correct NDFA for the following mentioned expression? (ab)*∪(aba)*.

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Q. Construct a NDFA for the following regular expression :

(a∪b)*aba(a∪b)*

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Q. A deterministic finite automation (DFA)D with alphabet ∑= {a,b} is given below.
Which of the following is a valid minimal DFA which accepts the same language as D?

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