Theory of Automata MCQs with Answers
Practice important Theory of Automata MCQs with answers and explanations.
Multiple Choice Questions
Q491: How is the PDA's STACK used in processing the word 'aaab'?
- A: By performing PUSH and POP operations based on CFG rules
- B: By only reading from the TAPE
- C: By only pushing characters onto the STACK
- D: By ignoring CFG rules
View Answer
A
Q492: What happens when the PDA enters the ACCEPT state?
- A: The string is accepted
- B: The string is rejected
- C: The machine continues to run
- D: The machine pauses
View Answer
A
Q493: What is the conversion form of a PDA?
- A: A PDA in which every READ or HERE is followed by a POP and has specific conditions
- B: A PDA that accepts only deterministic languages
- C: A PDA with multiple REJECT states
- D: A PDA that starts with an ACCEPT state
View Answer
A
Q494: What does the HERE state in a PDA do?
- A: It is placed in the middle of any edge to facilitate conversion to standard form
- B: It represents an ACCEPT state
- C: It replaces a POP state
- D: It starts the PDA
View Answer
A
Q495: In the conversion form of a PDA, what must follow every READ or HERE state?
- A: A POP state
- B: Another READ state
- C: A PUSH state
- D: A REJECT state
View Answer
A
Q496: What is the purpose of the bottom of STACK symbol ($) in the PDA conversion form?
- A: To prevent popping the STACK beneath this symbol and to be replaced if popped
- B: To start the PDA
- C: To mark the end of the input string
- D: To accept the input string
View Answer
A
Q497: How is the input string processed in a PDA converted to conversion form?
- A: The entire input string must be read before acceptance
- B: The input string is accepted immediately
- C: The input string is only partially read
- D: The input string is ignored
View Answer
A
Q498: What happens when a PDA is converted into conversion form and the STACK is initially empty?
- A: A bottom of STACK symbol $ is placed on the STACK
- B: The PDA is immediately accepted
- C: The PDA is rejected
- D: The STACK is ignored
View Answer
A
Q499: What must be ensured when converting a PDA to conversion form regarding the edges?
- A: Every edge leading out of READ or HERE states goes directly into a POP state
- B: Edges can lead to any state
- C: Edges are ignored in conversion form
- D: Edges can lead to multiple POP states
View Answer
A
Q500: In the conversion form of a PDA, how are non-deterministic choices handled?
- A: They occur at READ or HERE states, not at POP states
- B: They occur at POP states
- C: They are not allowed
- D: They occur at START states
View Answer
A