Electric Circuits
Advantage of active filter is

  do not offer gain.
  easy to tune.
  derive high impedance load.
  both of above.

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Electric Circuits
What is referred as the average value in AC opearation?

 Average of all values of the phase sequences.
  Average of all values of an alternating quantity over a complete cycle.
 Average of all values of the (+)ve and (-)ve half.
 Average of all values of an alternating quantity.

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