Analog Electronics
The arrow direction in diode symbol indicates

  direction of hole flow.
  opposite to the direction of hole flow.
  direction of electron flow.
  none of these.

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

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

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