Analog electronics circuits miscellaneous


Analog electronics circuits miscellaneous

Analog Electronic Circuits

  1. The ideal characteristic of a stabilizer is:









  1. View Hint View Answer Discuss in Forum

    Voltage stabilizer (i.e. zener diode or other device, that suppresses variation in a D.C. voltage) is always connected in parallel with load, so ideally its internal resistance must be zero
    Lower the value of Rz gives better constant voltage.
    Hence alternative (A) is the correct choice.


    Correct Option: A

    Voltage stabilizer (i.e. zener diode or other device, that suppresses variation in a D.C. voltage) is always connected in parallel with load, so ideally its internal resistance must be zero
    Lower the value of Rz gives better constant voltage.
    Hence alternative (A) is the correct choice.



  1. Consider the following statements regarding the circuit given in the figure below, where the output voltage is constant:
    (i) Vin > the voltage at which the zener breaks down
    (ii) iL < the difference between I and Iz, current at which the zener breaks down
    (iii) RS < the zener nominal resistance of these statements











  1. View Hint View Answer Discuss in Forum

    NA

    Correct Option: B

    NA



  1. A zener diode in the circuit shown below, has a knee current of 5 mA, and a maximum allowed power dissipation of 300 mW. What are the minimum and maximum load current that can be drawn safely from the circuit, keeping the output voltage V0 at 6 V?











  1. View Hint View Answer Discuss in Forum

    Given, IZ (min) = 5 mA
    V0 = 6 V = Vz
    (according to given condition).
    Maximum power dissipation means maximum zener current
    i.e. Iz (max) = Pmax V = 300 mW 6 V = 50 mA
    from figure
    I = Vin – Vz 50 = 9 – 6 50 = 60 mA
    and I = IZ + IL
    IL (min) = I – Iz (max) = 60 – 50 = 10 mA
    IL (max) = I – Iz (min) = 60 – 5 = 55 mA
    Hence alternative (C) is the correct choice.


    Correct Option: C

    Given, IZ (min) = 5 mA
    V0 = 6 V = Vz
    (according to given condition).
    Maximum power dissipation means maximum zener current
    i.e. Iz (max) = Pmax V = 300 mW 6 V = 50 mA
    from figure
    I = Vin – Vz 50 = 9 – 6 50 = 60 mA
    and I = IZ + IL
    IL (min) = I – Iz (max) = 60 – 50 = 10 mA
    IL (max) = I – Iz (min) = 60 – 5 = 55 mA
    Hence alternative (C) is the correct choice.



  1. In order to obtain a 12-V stabilized supply from the current shown in figure below, the input to terminals A and B should be:











  1. View Hint View Answer Discuss in Forum

    Input voltage should be greater than 12 V to allow for drop across R. Since Zener diode always work in reverse - biased mode. Terminal A should obviously, be positive.


    Correct Option: D

    Input voltage should be greater than 12 V to allow for drop across R. Since Zener diode always work in reverse - biased mode. Terminal A should obviously, be positive.




  1. The current flowing through the zener diode of figure below is:











  1. View Hint View Answer Discuss in Forum

    From given figure

    I =
    50 – Vz
    =
    50 – 30
    R4 × 103

    or I = 5 × 10–3
    or I = 5 mA.


    Correct Option: A

    From given figure

    I =
    50 – Vz
    =
    50 – 30
    R4 × 103

    or I = 5 × 10–3
    or I = 5 mA.