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The characteristic equation of D flip-flop is:

  • A.Q = 1
  • B.Q = 0
  • C.Q = D̄
  • D.Q= D

Answer: D

Correct answer: Q= D

A D flip-flop transfers its input to its output at the clock edge, so its characteristic equation is \( Q_{next} = D \). It is the simplest of the flip-flops precisely because the next state does not depend on the present one.

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