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FA4- Automata

QuestionAnswer
1. TRUE OR FALSE. Elimination of null and unit productions and symbols is called reduction of CFG Group of answer choices True False TRUE
2. TRUE OR FALSE. Given the CFG with P: S -> AC | a, A -> a. After simplification of the CFG, the resulting grammar is S λ. FALSE
3. FILL IN THE BLANKS (use all caps for your answer). A reduced _______ is the result of removing useless symbols and productions. GRAMMAR
4. FILL IN THE BLANKS (use all caps for your answer). Useless symbols are those variables and terminals that do not appear in any derivation of strings of _________. TERMINALS
5. FILL IN THE BLANKS. Given the CFG with P: S --> AC | a, A --> a. The non-generating symbol is ___. C
6. FILL IN THE BLANKS. Consider the CFG with P: S --> aC | bX A --> CAd | bSX | a C --> aSC | bCX X --> SCD | aCX | ad After simplification, the resulting grammar is S bX and X ___. ad
7. TRUE OR FALSE. Consider the CFG with P: S --> aC | bX A --> CAd | bSX | a C --> aSC | bCX X --> SCD | aCX | ad Is X a useful symbol? TRUE
8. TRUE OR FALSE. Consider the CFG with P: S --> aC | bX A --> CAd | bSX | a C --> aSC | bCX X --> SCD | aCX | ad Is A reachable? FALSE
9. TRUE OR FALSE. Consider the CFG with P: S --> aC | bX A --> CAd | bSX | a C --> aSC | bCX X --> SCD | aCX | ad Is C useful? FALSE
10. TRUE OR FALSE. In a CFG, a non-terminal symbol is nullable if there is a derivation that starts with that non-terminal symbol and leads to a null. TRUE
11. TRUE OR FALSE. A CFG is in CNF if a production has a non-terminal leads to a string of a non-terminal and a terminal symbol. FALSE
12. TRUE OR FALSE. If a production has a non-terminal symbol leading to a terminal symbol, it is said to be in CNF. TRUE
13. TRUE OR FALSE. The production B cDa is in GNF. FALSE
14. TRUE OR FALSE. The production D dD is not in GNF. FALSE
15. TRUE OR FALSE. One of the steps in converting a CFG into GNF is removing all null productions and not removing unit productions. FALSE
Created by: krazyhippo
 

 



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