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ISRO | ISRO CS 2013 | Question 30

  • Last Updated : 20 Nov, 2018
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In a three stage counter, using RS flip flops what will be the value of the counter after giving 9 pulses to its input? Assume that the value of counter before giving any pulses is 1.

(A) 1
(B) 2
(C) 9
(D) 10


Answer: (B)

Explanation: In a three stage counter, using RS flip flops, the value of counter will return to initial stage after 8 pulses and in the 9th pulse, the counter stage will exceed by 1.

Initial value of counter = 1
After 8 pulses : 1-> 2-> 3-> 4-> 5-> 6 -> 7-> 0-> 1
After 9th pulse: 1-> 2 

Option (B) is correct.

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