Analog Electronics
In a nonlinear op-amp circuit, the

  output shape is the same as the input shape.
  feedback loop is never opened.
  opamp may saturate.
  opamp never saturates.

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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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