Analog Electronics
In CB configuration, the output V-I characteristics of a transistor are drawn by taking

  VCB versus IC for constant IE.
  VCB versus IB for constant IE.
  VCE versus IC for constant IE.
  VCB versus IB for constant IE.

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Analog Electronics
For transistor action

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

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