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Analog Electronics

Analog Electronics
The input impedance of the base of an emitter follower is usually

 open.
  high.
 shorted to ground.
 low.

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Analog Electronics
A voltage regulator is a circuit which

  converts the AC voltage to DC voltage.
None of these
  maintains constant DC output voltage inspite of the fluctu
  smoothed the AC variation in DC output voltage.

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Analog Electronics
Doping in a semiconductor increases which quantity

 Conductance
 None
 Inductance
 Resistance

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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
What will be the result if pentavalent impurity is added to pure germanium or silicon ?

 Intrinsic semiconductor
 N-type semiconductor
None of these
 P-type semiconductor

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Analog Electronics
A zener diode voltage regulator has load requirement of 12 V and 2 Amp. The zener diode's minimum current requirement is 0.2 A. The minimum voltage at input is 24 V. What is maximum efficiency of circuit?

 45.5 %.
 34.3 %.
 66.3 %.
 52.8 %.

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