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Method of communication in which transmission takes place in both directions, but only in one direction at a time, is called

  • A.simplex
  • B.four wire circuit
  • C.full duplex
  • D.half duplex

Answer: D

Correct answer: half duplex

Half duplex allows both directions but only one at a time, so the line must be turned round between transmissions. Full duplex allows both at once and simplex only one direction ever.

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