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Automata Transitions Quiz

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Questions and Answers

In a Pushdown Automata (PDA), which state is typically the initial state?

q1
qf
q0 (correct)
q2

What is the purpose of the Start Symbol in a PDA?

To represent the stack alphabet
To mark the states in the PDA
To initialize the stack with a specific symbol (correct)
To indicate the beginning of the input string

Which of the following represents a production rule in a Context-Free Grammar (CFG)?

S -> a S A (correct)
q1, a, S = {q1, SA}
A -> b B
(q1, b, A) = {q1, B}

What does the transition (q1, a, S) = { (q1, SA) } represent in a PDA?

Moving from state q1 with input 'a' and updating the stack to SA (A) Signup and view all the answers

Which assumption must be satisfied for converting a PDA to a CFG?

(qi, a, A) = (c1,c2,c3….cn} where ci = (qj, BC) (C) Signup and view all the answers

What is the role of symbol 'z' in the context of PDAs?

It denotes the empty stack symbol (B) Signup and view all the answers

How does a PDA typically enter its final state?

(q1, , z) = { (q2, The PDA for the given Grammar is: CREATED BY K.VICTOR ) } (B) Signup and view all the answers

Which of the following correctly describes a production rule in the form A -> b B?

(q1, b, A) = { (q1, B )} (D) Signup and view all the answers

What does it mean when a transition rule in a PDA increases the stack content by a single symbol?

A symbol is pushed onto the stack during the transition. (B) Signup and view all the answers

Which of these transitions is not valid according to PDA rules?

( q0 , q1 , CFG for nPDA Conversion of PDA to CFG ) (B) Signup and view all the answers

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