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

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

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Analog Electronics
For transistor action

  all of these.
  the base region must be very thin and lightly doped.
  the emitter should be heavily doped.
  Je must be forward biased and Jc should be reverse biased.

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Analog Electronics
Pinch-off voltage in a JFET is

 the gate to source voltage that gives unity drain current.
 the drain voltage that gives zero drain current.
 the gate to source voltage that gives zero drain current.
 the drain voltage that gives infinite drain current.

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