For an R S flip flop : (A) R = 0, S = 0, Qn+1 = 1...

 

52) For an R S flip flop :

• (A) R = 0, S = 0, Q_n+1 = 1
• (B) R = 0, S = 0, Q_n+1 = Q_n
• (C) R = 0, S = 0, Q_n+1 = Q_n
• (D) R = 1, S = 0, Q_n+1 = 0
• (E) R = 0, S = 1, Q_n+1 = 1

Choose the correct answer from the options given below :

• (1) (C), (D), (E) only
• (2) (A), (D), (E) only
• (3) (B), (D), (E) only
• (4) (C) and (D) only

Answer: Option A

Solution

To determine the correct statements, we must refer to the standard characteristic behavior (truth table) of an RS (Reset-Set) Flip-Flop:

S (Set)	R (Reset)	Qn+1 (Next State)	Operation
0	0	Qn	Hold (No Change)
0	1	0	Reset
1	0	1	Set
1	Indeterminate	Invalid	Forbidden State

Evaluation of Statements:

• (A) R=0, S=0, Q_n+1=1: Incorrect. (Should be Q_n).
• (B) R=0, S=0, Q_n+1=Q_n: Incorrect. (This is toggle behavior, not RS).
• (C) R=0, S=0, Q_n+1=Q_n: Correct. (Hold state).
• (D) R=1, S=0, Q_n+1=0: Correct. (Reset state).
• (E) R=0, S=1, Q_n+1=1: Correct. (Set state).

Conclusion: Statements (C), (D), and (E) are correct.

Correct Option: (1) (C), (D), (E) only

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