Analog Electronics
The electric current ICBO flows in the

  emitter and collector leads.
  none of them.
  emitter and base leads.
  collector and base leads.

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Analog Electronics
The typical input stage of an opamp has a

  single - ended input and single-ended output.
  single - ended input and differential output.
  differential input and single - ended output.
  differential input and differential output.

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Analog Electronics
For transistor action

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

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