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Which of the following is NOT a correct type of flipflop?

  • A.JK flipflop
  • B.D flipflop
  • C.S flipflop
  • D.T flipflop

Answer: C

The standard flipflops are the SR (set reset) flipflop, the JK flipflop, the D (data or delay) flipflop and the T (toggle) flipflop. There is an SR flipflop, but there is no flipflop that has only a set input and is called an S flipflop, so that is the one that is not a correct type.


The JK flipflop removes the forbidden state of the SR type, the D flipflop copies its input to the output on the clock edge, and the T flipflop toggles when T is high. The answer is S flipflop, option C.

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