TOC · Automata & Languages interview questions

1. A.a finite-state machine with exactly one transition per state and input symbol, accepting regular languages
2. B.a pattern notation using union, concatenation, and star that exactly describes the regular languages
3. C.an abstract model with an infinite tape and head that defines the limit of what is computable
4. D.a finite, non-empty set of symbols from which strings of a language are formed

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1. A.nondeterministic finite automaton (NFA)
2. B.undecidable problem
3. C.pumping lemma
4. D.deterministic finite automaton (DFA)

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1. A.deterministic finite automaton (DFA) — a finite-state machine allowing multiple or epsilon transitions, equivalent in power to a DFA
2. B.deterministic finite automaton (DFA) — a problem for which no algorithm can always halt with the correct answer, such as the halting problem
3. C.deterministic finite automaton (DFA) — a finite-state machine with exactly one transition per state and input symbol, accepting regular languages
4. D.deterministic finite automaton (DFA) — the four-level classification of grammars: type 0 recursively enumerable down to type 3 regular

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1. A.a finite-state machine allowing multiple or epsilon transitions, equivalent in power to a DFA
2. B.a finite, non-empty set of symbols from which strings of a language are formed
3. C.a pattern notation using union, concatenation, and star that exactly describes the regular languages
4. D.the undecidable question of whether an arbitrary program will eventually stop on a given input

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1. A.nondeterministic finite automaton (NFA)
2. B.decidable language
3. C.pumping lemma
4. D.Turing machine

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1. A.nondeterministic finite automaton (NFA) — the undecidable question of whether an arbitrary program will eventually stop on a given input
2. B.nondeterministic finite automaton (NFA) — the four-level classification of grammars: type 0 recursively enumerable down to type 3 regular
3. C.nondeterministic finite automaton (NFA) — a finite-state machine allowing multiple or epsilon transitions, equivalent in power to a DFA
4. D.nondeterministic finite automaton (NFA) — an abstract model with an infinite tape and head that defines the limit of what is computable

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1. A.a problem for which no algorithm can always halt with the correct answer, such as the halting problem
2. B.a language whose strings a Turing machine accepts, though it may loop forever on rejected strings
3. C.a language for which a Turing machine always halts with a correct yes or no answer
4. D.a language that can be recognized by a finite automaton and described by a regular expression

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1. A.recursively enumerable language
2. B.regular language
3. C.alphabet
4. D.undecidable problem

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1. A.regular language — an abstract model with an infinite tape and head that defines the limit of what is computable
2. B.regular language — a language that can be recognized by a finite automaton and described by a regular expression
3. C.regular language — a finite, non-empty set of symbols from which strings of a language are formed
4. D.regular language — a grammar that allows some string to have more than one distinct parse tree

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1. A.a language for which a Turing machine always halts with a correct yes or no answer
2. B.a finite automaton augmented with a stack, recognizing exactly the context-free languages
3. C.a pattern notation using union, concatenation, and star that exactly describes the regular languages
4. D.the undecidable question of whether an arbitrary program will eventually stop on a given input

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1. A.halting problem
2. B.recursively enumerable language
3. C.undecidable problem
4. D.regular expression

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1. A.regular expression — a finite, non-empty set of symbols from which strings of a language are formed
2. B.regular expression — a finite automaton augmented with a stack, recognizing exactly the context-free languages
3. C.regular expression — a pattern notation using union, concatenation, and star that exactly describes the regular languages
4. D.regular expression — a grammar that allows some string to have more than one distinct parse tree

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1. A.a finite, non-empty set of symbols from which strings of a language are formed
2. B.a pattern notation using union, concatenation, and star that exactly describes the regular languages
3. C.a property every regular language must satisfy, used to prove certain languages are not regular
4. D.the undecidable question of whether an arbitrary program will eventually stop on a given input

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1. A.recursively enumerable language
2. B.pushdown automaton (PDA)
3. C.alphabet
4. D.regular expression

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1. A.alphabet — a finite, non-empty set of symbols from which strings of a language are formed
2. B.alphabet — a language that can be recognized by a finite automaton and described by a regular expression
3. C.alphabet — a finite automaton augmented with a stack, recognizing exactly the context-free languages
4. D.alphabet — a grammar that allows some string to have more than one distinct parse tree

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1. A.a set of production rules with a single nonterminal on each left side, generating context-free languages
2. B.a property every regular language must satisfy, used to prove certain languages are not regular
3. C.a language whose strings a Turing machine accepts, though it may loop forever on rejected strings
4. D.a pattern notation using union, concatenation, and star that exactly describes the regular languages

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1. A.context-free grammar (CFG)
2. B.nondeterministic finite automaton (NFA)
3. C.ambiguous grammar
4. D.Chomsky hierarchy

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1. A.context-free grammar (CFG) — a pattern notation using union, concatenation, and star that exactly describes the regular languages
2. B.context-free grammar (CFG) — a set of production rules with a single nonterminal on each left side, generating context-free languages
3. C.context-free grammar (CFG) — the undecidable question of whether an arbitrary program will eventually stop on a given input
4. D.context-free grammar (CFG) — the four-level classification of grammars: type 0 recursively enumerable down to type 3 regular

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1. A.a finite, non-empty set of symbols from which strings of a language are formed
2. B.a language for which a Turing machine always halts with a correct yes or no answer
3. C.a finite automaton augmented with a stack, recognizing exactly the context-free languages
4. D.a language whose strings a Turing machine accepts, though it may loop forever on rejected strings

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1. A.pumping lemma
2. B.context-free grammar (CFG)
3. C.regular expression
4. D.pushdown automaton (PDA)

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1. A.pushdown automaton (PDA) — a finite automaton augmented with a stack, recognizing exactly the context-free languages
2. B.pushdown automaton (PDA) — a property every regular language must satisfy, used to prove certain languages are not regular
3. C.pushdown automaton (PDA) — a problem for which no algorithm can always halt with the correct answer, such as the halting problem
4. D.pushdown automaton (PDA) — a pattern notation using union, concatenation, and star that exactly describes the regular languages

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1. A.a pattern notation using union, concatenation, and star that exactly describes the regular languages
2. B.the four-level classification of grammars: type 0 recursively enumerable down to type 3 regular
3. C.a set of production rules with a single nonterminal on each left side, generating context-free languages
4. D.an abstract model with an infinite tape and head that defines the limit of what is computable

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1. A.nondeterministic finite automaton (NFA)
2. B.decidable language
3. C.pushdown automaton (PDA)
4. D.Turing machine

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1. A.Turing machine — a language for which a Turing machine always halts with a correct yes or no answer
2. B.Turing machine — a language that can be recognized by a finite automaton and described by a regular expression
3. C.Turing machine — a property every regular language must satisfy, used to prove certain languages are not regular
4. D.Turing machine — an abstract model with an infinite tape and head that defines the limit of what is computable

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1. A.the four-level classification of grammars: type 0 recursively enumerable down to type 3 regular
2. B.a set of production rules with a single nonterminal on each left side, generating context-free languages
3. C.a finite automaton augmented with a stack, recognizing exactly the context-free languages
4. D.an abstract model with an infinite tape and head that defines the limit of what is computable

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1. A.ambiguous grammar
2. B.Chomsky hierarchy
3. C.deterministic finite automaton (DFA)
4. D.halting problem

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1. A.Chomsky hierarchy — the four-level classification of grammars: type 0 recursively enumerable down to type 3 regular
2. B.Chomsky hierarchy — a finite, non-empty set of symbols from which strings of a language are formed
3. C.Chomsky hierarchy — a finite automaton augmented with a stack, recognizing exactly the context-free languages
4. D.Chomsky hierarchy — a language for which a Turing machine always halts with a correct yes or no answer

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1. A.a grammar that allows some string to have more than one distinct parse tree
2. B.a finite automaton augmented with a stack, recognizing exactly the context-free languages
3. C.the four-level classification of grammars: type 0 recursively enumerable down to type 3 regular
4. D.a property every regular language must satisfy, used to prove certain languages are not regular

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1. A.ambiguous grammar
2. B.context-free grammar (CFG)
3. C.pushdown automaton (PDA)
4. D.regular expression

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1. A.ambiguous grammar — an abstract model with an infinite tape and head that defines the limit of what is computable
2. B.ambiguous grammar — a finite-state machine allowing multiple or epsilon transitions, equivalent in power to a DFA
3. C.ambiguous grammar — a grammar that allows some string to have more than one distinct parse tree
4. D.ambiguous grammar — a set of production rules with a single nonterminal on each left side, generating context-free languages

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