Analog Electronics
The action of JFET in its equivalent circuit can best be represented as a

Current controlled Current source
Current controlled voltage source
voltage controlled current source
Voltage controlled voltage source

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Analog Electronics
The ICBO is the electric current that flows when some DC voltage is applied

  in the reverse direction to the collector junction with emitter open.
  in the forward direction to the emitter junction with collector open.
  in the forward direction to the collector junction with emitter open.
  in the reverse direction to the emitter junction with collector open.

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