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Communication Systems - Engineering

Q1:

Some multiplexing arrangements for telephone system are
  1. Space multiplexing
  2. Time division multiplexing
  3. Frequency division multiplexing
Which of the above allow transmission of many independent signals over a single channel?

A 1 only

B 2 and 3 only

C 1, 2, 3

D 1 and 3 only

ANS:B - 2 and 3 only

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