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  • Question
  • 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

  • Correct Answer
  • 0.7 

    Explanation
    A feedback amplifier is stable if loop gain is less than unity. More less, more stable, hence ? will be more stable.

    Analog Electronics problems


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    • 1. The load impedance ZL of a CE amplifier has R and L in series. The phase difference between output and input will be

    • Options
    • A. 180°
    • B. 0
    • C. more than 90° but less than 180°
    • D. more than 180° but less than 270°
    • Discuss
    • 2. In figure what is the base current if VBE = 0.7 V

    • Options
    • A. 10 mA
    • B. 9.3 mA
    • C. 10 ?A
    • D. 9.3 ?A
    • Discuss
    • 3. Si transistor of following figure has a = 0.9 and ICE= 0, VEE = 5 V and VCC = 13 V, then RE will be if IEQ = 1 mA

    • Options
    • A. 3 k?
    • B. 4 k?
    • C. 5 k?
    • D. 4.3 k?
    • Discuss
    • 4. In the amplifier circuit of figure hfe = 100 and hie = 1000 ?. The voltage gain of amplifier is about

    • Options
    • A. 0.33
    • B. 0.5
    • C. 0.66
    • D. 1
    • Discuss
    • 5. Maximum efficiency of class B power amplifier is 50%.

    • Options
    • A. True
    • B. False
    • Discuss
    • 6. 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
    • 7. 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
    • 8. An exponential amplifier has diode in feedback path.

    • Options
    • A. True
    • B. False
    • Discuss
    • 9. 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
    • 10. Gain of the amplifier is 'A'. Then the I/P impedance and O/P impedance of the closed loop amplifier shown below would be

    • Options
    • A.
    • B.
    • C.
    • D.
    • Discuss


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