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Aim

Theory

Pretest

Procedure

Simulation

Posttest

References

Contributors

Feedback

Construct Pushdown Automata

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Beginner

Intermediate

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What is the primary purpose of the stack in a pushdown automaton (PDA)?

a: To store input symbols. Explanation

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b: To store intermediate results and track computations. Explanation

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c: To store the final output. Explanation

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d: To perform arithmetic operations. Explanation

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What distinguishes a pushdown automaton (PDA) from a finite automaton (FA)?

a: The PDA has an infinite tape. Explanation

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b: The PDA has a stack for additional memory. Explanation

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c: The PDA uses only states without transitions. Explanation

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d: The PDA recognizes only regular languages. Explanation

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Which type of languages can a PDA recognize that a finite automaton cannot?

a: Regular languages Explanation

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b: Context-free languages Explanation

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c: Context-sensitive languages Explanation

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d: All languages Explanation

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What is a configuration of a pushdown automaton (PDA)?

a: The set of states in the PDA Explanation

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b: The current state, remaining input, and stack contents Explanation

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c: The transition table of the PDA Explanation

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d: The set of terminal symbols Explanation

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Which acceptance methods are used by a PDA?

a: By final state or empty stack Explanation

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b: By input length only Explanation

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c: By number of states Explanation

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d: By stack size only Explanation

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How does a PDA process input differently from a finite automaton (FA)?

a: It reads the input twice. Explanation

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b: It uses the stack to make decisions based on input and stack content. Explanation

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c: It ignores some input symbols. Explanation

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d: It only works with empty strings. Explanation

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