Analog Electronics
A JFET can operate in

  enhancement mode only.
  depletion and enhancement mode only.
  none of these.
  depletion mode only.

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

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Analog Electronics
Optocouplers combine

  Infrared light emitting diode and a silicon photo transistor.
 Power transistor and silicon transistor.
 SITs and BJTs.
 IGBTs and MOSFETs.

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