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  • Question

  • Gain of the amplifier is 'A'. Then the I/P impedance and O/P impedance of the closed loop amplifier shown below would be
    Gain of the amplifier is 'A'. Then the I/P impedance and O/P impedance of the closed loop amplifier


  • Options
  • A. Gain of the amplifier is 'A'. Then the I/P impedance and O/P impedance of the closed loop amplifier
  • B. Gain of the amplifier is 'A'. Then the I/P impedance and O/P impedance of the closed loop amplifier
  • C. Gain of the amplifier is 'A'. Then the I/P impedance and O/P impedance of the closed loop amplifier
  • D. Gain of the amplifier is 'A'. Then the I/P impedance and O/P impedance of the closed loop amplifier

  • Correct Answer
  •  

    Explanation
    By using Miller theorem circuit can be redrawn as

    Gain of the amplifier is 'A'. Then the I/P impedance and O/P impedance of the closed loop amplifier

    Gain of the amplifier is 'A'. Then the I/P impedance and O/P impedance of the closed loop amplifier .

    Analog Electronics problems

    Search Results

    • 1. Consider the following statements : A clamper circuit

      1. adds or subtracts a dc voltage to a waveform
      2. does not change the waveform
      3. amplifiers the waveform
      Which are correct?

    • Options
    • A. 1, 2
    • B. 1, 3
    • C. 1, 2, 3
    • D. 2, 3
      • Discuss
    • 2. An exponential amplifier has diode in feedback path.

    • Options
    • A. True
    • B. False
      • Discuss
    • 3. In figure The minimum and maximum load currents are

    • Options
    • A. 0 and 60 mA
    • B. 0 and 120 mA
    • C. 10 mA and 60 mA
    • D. 10 mA and 120 mA
      • Discuss
    • 4. A bridge rectifier circuit has input of 50 Hz frequency. The load resistance is RL and filter capacitance is C. For good output wave shape, the time constant RLC should be at least equal to

    • Options
    • A. 10 ms
    • B. 20 ms
    • C. 50 ms
    • D. 100 ms
      • Discuss
    • 5. An amplifier with loop gain A? will be more stable for value of A? as

    • Options
    • A. 0.95
    • B. 0.7
    • C. 1.2
    • D. 1.5
      • Discuss
    • 6. In a CE amplifier the input impedance is equal to the ratio of

    • Options
    • A. ac base voltage to ac base current
    • B. ac base voltage to ac emitter current
    • C. ac emitter voltage to ac collector current
    • D. ac collector voltage to ac collector current
      • Discuss
    • 7. A CB amplifier has re = 6 ?, RL = 600 ? and a = 0.98. The voltage gain is

    • Options
    • A. 100
    • B. 600 x 0.98
    • C. 98
    • D. 6
      • Discuss
    • 8. A stepper motor is

    • Options
    • A. a two phase induction motor
    • B. is a kind of rotating amplifier
    • C. is an electromagnetic transducer used to convert an angular position of shaft into electrical signal
    • D. is an electromechanical device which actuates a train of step angular movements in response to a train of input pulses on one to one basis
      • Discuss
    • 9. The phase margin and damping ratio have no relation.

    • Options
    • A. True
    • B. False
      • Discuss
    • 10. In the given figure the input is x(t) = A sin ?t. The steady state output y(t) =

    • Options
    • A. A sin (?t + ?) where ? = tan-1 |G(j?)|
    • B. |G(j?)| A sin [?t + ?G(j?)]
    • C. |G(j?)| A sin [2?t + ?G(j?)]
    • D. A G(j?) sin [?t + ?G(j?)]
      • Discuss

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