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In which of the following adder circuits, the carry look ripple delay is eliminated ?

  • A.Half adder
  • B.Full adder
  • C.Parallel adder
  • D.Carry-look-ahead adder

Answer: C

Correct answer: Parallel adder

In a ripple carry chain each stage must wait for the carry from the one below it, so the delay accumulates. The question's intended contrast is with a parallel adder, in which the bits are presented and added simultaneously rather than passed along a serial chain.

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