Analog Electronics
The arrow direction in diode symbol indicates

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

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Analog Electronics
For an NPN transistor in normal bias

  only majority carriers cross the collector junction.
  Je is forward biased and Jc is reverse biased.
  the emitter junction has high resistance.
  only holes cross the collector junction.

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