Question

Two J-K flip-flops with their J-K inputs tied HIGH are cascaded to be used as counters. After four input clock pulses, the binary count is ________

(a) 00

(b) 11

(c) 01

(d) 10

I have been asked this question in my homework.

The origin of the question is Flip Flops in division Flip-Flops of Digital Circuits

Answer 1

The correct option is (a) 00

The explanation: Every O/P repeats after its mod. Here mod is 4 (because 2 flip-flops are used. So mod = 2^2 = 4). So after 4 clock pulses the O/P repeats i.e. 00.