Analog Electronics
When the diode is forward biased, it is equivalent to

  a high resistance.
  an on switch.
None of these
  an off switch.

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Analog Electronics
Voltage Series (feedback also called series-shunt feedback) results in

Decreases in both input & output impedances
Increase in both input & output impedances
Increase in input impedance & decreases in output impedance
Decrease in input impedance & increase in output impedance

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