Analog Electronics
Under normal reverse bias voltage applied to diode, the reverse electric current in Si diode

  none of them.
  1000 micro A.
  order of micro A.
  100 mA.

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Analog Electronics
In all base driver amplifiers

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

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