Theory of Automata MCQs with Answers
Practice important Theory of Automata MCQs with answers and explanations.
Multiple Choice Questions
Q501: What is the role of the conversion form in the context of PDA and CFG?
- A: It facilitates the conversion of a PDA to a CFG and vice versa
- B: It simplifies the PDA without affecting CFG conversion
- C: It removes the need for CFG conversion
- D: It changes the language accepted by the PDA
View Answer
A
Q502: How does the PDA ensure that the STACK does not pop beneath the bottom of STACK symbol $?
- A: By replacing the symbol $ if it is ever popped and never popping beneath it
- B: By allowing unlimited popping of STACK
- C: By ignoring the STACK symbol $
- D: By replacing the symbol $ with another symbol
View Answer
A
Q503: What is the key condition for a PDA to be in conversion form regarding branching?
- A: All branching must occur at READ or HERE states, not at POP states
- B: Branching can occur at any state
- C: Branching is not allowed
- D: Branching only occurs at POP states
View Answer
A
Q504: What is a common step in the conversion process of a PDA to conversion form?
- A: Ensuring every READ or HERE state is followed by a POP state
- B: Adding more REJECT states
- C: Ignoring all non-deterministic choices
- D: Changing the language accepted by the PDA
View Answer
A
Q505: What defines a PDA in conversion form?
- A: Conditions such as having exactly one ACCEPT state and no REJECT states
- B: Having multiple ACCEPT states and REJECT states
- C: Having no READ or HERE states
- D: Having no POP states
View Answer
A
Q506: What is the role of the bottom of STACK symbol ($) in the PDA conversion form?
- A: It is placed on the STACK to prevent popping beneath it and is only popped out before ACCEPT
- B: It is used to mark the end of the input string
- C: It is used to replace the symbol $ if it is ever popped
- D: It is ignored during processing
View Answer
A
Q507: In the PDA conversion form, what must occur before the machine can accept the input string?
- A: The entire input string must be read
- B: Only a part of the input string needs to be read
- C: The input string can be ignored
- D: The machine accepts the input immediately
View Answer
A
Q508: What is the primary purpose of converting a PDA to its conversion form?
- A: To simplify its representation and ensure it adheres to specific conditions
- B: To make the PDA non-deterministic
- C: To allow multiple REJECT states
- D: To eliminate the need for ACCEPT states
View Answer
A
Q509: How are paths represented in a PDA in conversion form?
- A: As sequences of rows from the summary table
- B: As strings of input letters
- C: As sequences of READ and HERE states
- D: As paths through the TAPE only
View Answer
A
Q510: What must be ensured for a row sequence to be considered a valid path in the PDA?
- A: The sequence must be joint consistent and STACK consistent
- B: The sequence must only be joint consistent
- C: The sequence must only be STACK consistent
- D: The sequence must contain only READ states
View Answer
A