Analog Electronics
A Semiconductor has a

 Constant Temperature coefficient of resistance
 Positive Temperature coefficient of resistance
 Negative Temperature coefficient of resistance
None of these

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Analog Electronics
For transistor action

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

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Analog Electronics
In all base driver amplifiers

None of these
ac collector voltage is in phase with ac base voltage
ac emitter voltage is 180° out of phase with ac base voltage
ac collector voltage is 180° out of phase with ac base voltage

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