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Microwave Communication - Engineering

Q1:

Consider the following applications
  1. TV tuning
  2. Active filter
  3. Microwave frequency multiplication
In which of above can a varactor diode be used?

A 1 2 and 3

B l and 2 only

C 1 and 3 only

D 2 and 3 only

ANS:A - 1 2 and 3

Varactor diode is used in all the three applications.