Analog Electronics
Voltage controlled oscillators are used commonly in

 Phase Clocked loops
 All the above
 Pulse Modulators Frequency Modulators Phase Clocked loops
 Frequency Modulators

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Analog Electronics
For an NPN transistor in normal bias

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

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