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NIELIT 2016 MAR Scientist B - Section C: 3

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The output of a sequential circuit depends on 

  1. present inputs only
  2. past inputs only
  3. both present and past inputs
  4. present outputs only
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sequential circuits have memory. they can store the prev stage output and use in the current computation . you can think of scientific calculator where you can use current ans in the next computation , whereas in normal calculator there are no such options. hence the most appropriate option i think C.
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Sequential circuit = Combinational Circuit + Memory Element .

The Memory Element is required for past output and based on that further actions will be taken without memory then that becomes simply Combinational circuit

So Sequential Circuit needs both Present Input and Past Output. Option C is correct.

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