Analog Electronics
In all base driver amplifiers

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

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Analog Electronics
For transistor action

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

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Analog Electronics
Why is silicon preferred than germanium ?

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

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