Analog Electronics
The Q-point in a voltage amplifier is selected in the middle of the active region because

  it gives distortions less output.
  it gives better stability.
  the circuit needs a small.
  the biasing circuit then need less number of resistors.

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Analog Electronics
Why is silicon preferred than germanium ?

 Silicon has higher tolerance to temperature
 Leakage current due to minority charge carrier is less in silicon
 All the above
 Current sensitivity of silicon with temperature is less

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