Analog Electronics
In CE configuration, the input V-I characteristics are drawn by taking

  VCE versus IC for constant value of IE.
  VBE versus IB for constant value of IC.
  VBE versus IB for constant value of VCE.
  VBE versus IE for constant value of VCE.

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Analog Electronics
A working diode must have

 High resistance when forward biased, while low resistance when reverse bias
 Low resistance when forward or reverse biased
 Low resistance when forward biased, while high resistance when reverse bias
 High resistance when forward or reverse biased

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