Analog Electronics
Voltage controlled oscillators are used commonly in

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

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Analog Electronics
The magnitude of electric current ICBO

  depends largely upon emitter-base junction base potential.
  depends largely upon the emitter doping.
  is generally greater in silicon than in germanium transistor.
  increases with the increase in temperature.

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