Zener Diode PYQs: JEE Mains Physics

Showing 1–34 of 34 questions

1. 1. A diode has Zener voltage of \(10\) V and maximum power dissipation of \(0.5\) W, then the minimum resistance to be used in series with this diode for safety when it is connected to a \(25\) V power supply is ______ \(\Omega\). 2026 Easy
2. 2. A voltage regulating circuit consisting of Zener diode, having break-down voltage of 10 V and maximum power dissipation of 0.4 W , is operated at 15 V . The approximate value of protective resistance in this circuit is _________ \(\Omega\). 2026 Easy
3. 3. Assuming in forward bias condition there is a voltage drop of 0.7 V across a silicon diode, the current through diode \(D _1\) in the circuit is ___________mA . (Assume all diodes in the given circuit are identical)
   2026 Hard
4. 4. The charge stored by the capacitor C in the given circuit in the steady state is _________ \(\mu C\).
   2026 Medium
5. 5. The following diagram shows a Zener diode as a voltage regulator. The Zener diode is rated at \(V _{ Z }=5 V\) and the desired current in load is 5 mA . The unregulated voltage source can supply upto 25 V . Considering the Zener diode can withstand four times of the load current, the value of resistor \(R _{ S }\) (shown in circuit) should be ___________ \(\Omega\).
   2026 Easy
6. 6. The maximum rated power of the LED is \(2\) mW and it is used in the circuit with input voltage of \(5\) V as shown in the figure below. The current through resistance \(R_S\) is \(0.5\) mA. The minimum value of the resistance of \(R_S\), to ensure that the LED is not damaged is _______ k\(\Omega\).
   2026 Hard
7. 7. A zener diode with 5 V zener voltage is used to regulate an unregulated dc voltage input of 25 V. For a \(400 \Omega\) resistor connected in series, the zener current is found to be 4 times load current. The load current \(\left(I_L\right)\) and load resistance \(\left(R_{\mathrm{L}}\right)\) are : 2025 Easy
8. 8. In the following circuit, the reading of the ammeter will be : (Take Zener breakdown voltage \(=4 \mathrm{~V})\)
   2025 Medium
9. 9. A Zener diode of breakdown voltage \(10 \mathrm{~V}\) is used as a voltage regulator as shown in the figure. The current through the Zener diode is _______.
   2024 Hard
10. 10. In the given circuit if the power rating of Zener diode is \(10 \mathrm{~mW}\), the value of series resistance \(R_s\) to regulate the input unregulated supply is _______.
    2024 Hard
11. 11. In the given circuit, the breakdown voltage of the Zener diode is \(3.0 \mathrm{~V}\). What is the value of \(\mathrm{I}_z\) ?
    2024 Hard
12. 12. The \(I-V\) characteristics of an electronic device shown in the figure. The device is _______.
    2024 Hard
13. 13. A zener diode of power rating \(1.6\,W\) is to be used as voltage regulator. If the zener diode has a breakdown of \(8\,V\) and it has to regulate voltage fluctuating between \(3\,V\) and \(10 \,V\). The value of resistance \(R_5\) for safe operation of diode will be \(.........\Omega\)
    2023 Medium
14. 14. A Zener of breakdown voltage \(V_{z}=8\,V\) and maximum zener current, \(I _{ ZM }=10\,mA\) is subjected to an input voltage \(V _{ i }=10\,V\) with series resistance \(R=100\,\Omega\). In the given circuit \(R_{L}\) represents the variable load resistance. The ratio of maximum and minimum value of \(R_{L}\) is
    2022 Hard
15. 15. In the circuit shown below, maximum zener diode current will be \(.....mA\)
    2022 Medium
16. 16. In the given circuit- the value of current \(I _{ L }\) will be \(mA\). (When \(R _{ L }=1 \,k\, \Omega\) )
    2022 Easy
17. 17. A zener diode having zener voltage \(8\, {V}\) and power dissipation rating of \(0.5\, {W}\) is connected across a potential divide arranged with maximum potential drop across zener diode is as shown in the diagram. The value of protective resistance \({R}_{{p}}\) is \(....\,\Omega\)
    2021 Medium
18. 18. A zener diode of power rating \(2\, {W}\) is to be used as a voltage regulator. If the zener diode has a breakdown of \(10 \,{V}\) and it has to regulate voltage fluctuated between \(6\, {V}\) and \(14\, {V}\), the value of \({R}_{{s}}\) for safe operation should be \(....\Omega\)
    2021 Hard
19. 19. For the circuit shown below, calculate the value of \({I}_{{z}}\) : (In \({mA}\))
    2021 Medium
20. 20. For the given circuit, the power across zener diode is ..... \({mW}.\)
    2021 Hard
21. 21. In a given circuit diagram, a \(5 \,{V}\) zener diode along with a series resistance is connected across a \(50 \,V\) power supply. The minimum value of the resistance required, if the maximum zener current is \(90\, {mA}\) will be \(.....\,\Omega .\)
    2021 Hard
22. 22. In connection with the circuit drawn below, the value of current flowing through \(2\, k \Omega\) resistor is ............. \(\times 10^{-4} A\)
    2021 Medium
23. 23. The value of power dissipated across the zener diode \(\left( V _{ z }=15 V \right)\) connected in the circuit as shown in the figure is \(x \times 10^{-1}\) watt.  The value of \(x ,\) to the nearest integer, is ..............
    2021 Medium
24. 24. The zener diode has a \(V _{ z }=30\, V\). The current passing through the diode for the following circuit is \(\ldots \ldots \ldots \,mA.\)
    2021 Hard
25. 25. The circuit shown below is working as a \(8\; \mathrm{V}\;dc\) regulated voltage source. When \(12 \;\mathrm{V}\) is used as input, the power dissipated (in \(\mathrm{mW}\) ) in each diode is (considering both zener diodes are identical)
    2020 Medium
26. 26. Figure shown a \(DC\) voltage regulator circuit, with a Zener diode of breakdown voltage \(= 6\,V\). If the unregulated input voltage varies between \(10\, V\) to \(16\, V\), then what is the maximum Zener current ?.......\(mA\)
    2019 Medium
27. 27. For the circuit shown below, the current through the Zener diode is......\(mA\)
    2019 Medium
28. 28. In the given circuit the current through Zener Diode is close to.......\(mA\)
    2019 Medium
29. 29. The figure represents a voltage regulator circuit using a Zener diode. The breakdown voltage of the Zener diode is \(6\,V\) and the load resistance is \(R_L= 4\,k\Omega .\) The series resistance of the circuit is \(R_i = 1\,k\Omega .\) If the battery voltage \(V_B\) varies from \(8\,V\) to \(16\,V,\) what are the minimum and maximum values of the current through Zener diode?
    2019 Hard
30. 30. The reverse breakdown voltage of a Zener diode is \(5.6\, V\) in the given circuit. The current \(I_z\) through the Zener is......\(mA\)
    2019 Hard
31. 31. In the given circuit, the current through zener diode is......\(mA\)
    2018 Hard
32. 32. An experiment is performed to determine the \(I-V\) characteristics of a Zener diode, which has a protective resistance of \(R = 100 \,\Omega ,\) and a maximum power of dissipation rating of \(1\,W\) .The minimum voltage range of the \(DC\) source in the circuit is 2016 Medium
33. 33. The value of the resistor, \(R_S\), needed in the \(dc\) voltage regulator circuit shown here, equals
    2015 Medium
34. 34. A Zener diode is connected to a battery and a load as show below: The currents, \(I, I_Z\) and \(I_L\) are respectively .
    2014 Hard

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