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
When a transistor is connected in common emitter mode, it with have

Medium input resistance and high output resistance
Negligible input resistance and high output resistance
Low input resistance as well as output resistance
High input resistance and low output resistance

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