Analog Electronics
When the current gain increases from 50 to 300 in an emitter-biased circuit, the collector current

 decreases by a factor of 6.
  remains almost the same.
 is zero.
 increases by a factor of 6.

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

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