Analog Electronics
Voltage controlled oscillators are used commonly in

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

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Analog Electronics
In all base driver amplifiers

ac collector voltage is in phase with ac base voltage
ac collector voltage is 180° out of phase with ac base voltage
None of these
ac emitter voltage is 180° out of phase with ac base voltage

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