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Zener Diode as a Voltage Regulator for JEE: 35 solved questions

Real JEE paper questions on zener diode as a voltage regulator, part of semiconductor electronics. Each opens with the options, the correct answer and a step-by-step solution. Papers run from 2014 to 2026. No sign-in needed to read them.

What this topic asks

• Zener current and series resistance — 30 questions
• Zener characteristics — 5 questions

All 35 questions with solutions

• Zener breakdown occurs in a p-n junction having p and n both JEE Main 24th Feb 2nd Shift 2021
• The following diagram shows a zener diode as a voltage regulator. The zener diode is rated at V_z=5 V and the… JEE Main 23rd Jan 1st Shift 2026
• A zener diode with 5 V zener voltage is used to regulate an unregulated dc voltage input of 25 V. For a 400 Ω… JEE Main 2nd April 1st Shift 2025
• In the following circuit, the reading of the ammeter will be (Take Zener breakdown voltage =4 V) [Figure: a 1… JEE Main 7th April 1st Shift 2025
• The I-V characteristics of an electronic device shown in the figure. The device is [Figure: I against V. In t… JEE Main 9th April 2nd Shift 2024
• In the given circuit, the breakdown voltage of the Zener diode is 3.0 V. What is the value of I_z? [Figure: a… JEE Main 29th Jan 1st Shift 2024
• A Zener diode of breakdown voltage 10 V is used as a voltage regulator as shown in the figure. The current th… JEE Main 30th Jan 2nd Shift 2024
• A zener diode of power rating 1.6 W is to be used as voltage regulator. If the zener diode has a breakdown of… JEE Main 10th April 1st Shift 2023
• Choose the correct statement about zener diode JEE Main 1st Feb 2nd Shift 2023
• For the circuit shown below, calculate the value of I_z. [Figure: a 100 V source Vᵢ in series with Rₛ=1000 Ω… JEE Main 20th July 1st Shift 2021
• Take the breakdown voltage of the zener diode used in the given circuit as 6 V. For the input voltage shown i… JEE Main 4th Sept 1st Shift 2020
• Two Zener diodes (A and B) having breakdown voltages of 6 V and 4 V respectively, are connected as shown in t… JEE Main 5th Sept 2nd Shift 2020
• The reverse break-down voltage of a Zener diode is 5.6 V in the given circuit. The current I_Z through the Ze… JEE Main 8th April 1st Shift 2019
• The figure represents a voltage regulator circuit using a Zener diode. The breakdown voltage of the Zener dio… JEE Main 10th April 2nd Shift 2019
• Figure shows a DC voltage regulator circuit, with a Zener diode of breakdown voltage =6 V. If the unregulated… JEE Main 12th April 2nd Shift 2019
• For the circuit shown here, the current through the Zener diode is [Figure: a 120 V source, 5 kΩ in series, a… JEE Main 10th Jan 2nd Shift 2019
• In the given circuit the current through Zener Diode is close to [Figure: a 12 V cell, R₁=500 Ω in series, th… JEE Main 11th Jan 1st Shift 2019
• In the given circuit, the current through zener diode is [Figure: a 15 V cell, R₁=500 Ω in series, then R₂=15… JEE Main Online 2018
• The value of the resistor, R_S, needed in the dc voltage regulator circuit shown here, equals [Figure: input… JEE Main Online 2015
• A Zener diode is connected to a battery and a load as shown below. The currents I, I_Z and I_L are respective… JEE Main Online 2014
• A diode has Zener voltage of 10 V and maximum power dissipation of 0.5 W, then the minimum resistance to be u… JEE Main 4th April 2nd Shift 2026
• A voltage regulating circuit consisting of Zener diode, having break-down voltage of 10 V and maximum power d… JEE Main 24th Jan 1st Shift 2026
• In the circuit shown below, maximum zener diode current will be mA. [Figure: a variable source (100 to 120) V… JEE Main 26th July 1st Shift 2022
• A 8 V Zener diode along with a series resistance R is connected across a 20 V supply (as shown in the figure)… JEE Main 29th July 2nd Shift 2022
• In the given circuit, the value of current I_L will be mA. (When R_L=1 kΩ) [Figure: a 10 V cell, a series res… JEE Main 24th June 2nd Shift 2022
• A zener of breakdown voltage V_Z=8 V and maximum zener current, I_ZM=10 mA is subjected to an input voltage V… JEE Main 28th June 2nd Shift 2022
• The circuit diagram used to study the characteristic curve of a zener diode is connected variable power suppl… JEE Main 30th June 1st Shift 2022
• For the given circuit, the power across the zener diode is mW. [Figure: a 24 V source, 1 kΩ in series, a Zene… JEE Main 26th Aug 2nd Shift 2021
• A zener diode of power rating 2 W is to be used as a voltage regulator. If the zener diode has a breakdown of… JEE Main 27th Aug 2nd Shift 2021
• A zener diode having zener voltage 8 V and power dissipation rating of 0.5 W is connected across a potential… JEE Main 20th July 2nd Shift 2021
• In a given circuit diagram, a 5 V zener diode along with a series resistance is connected across a 50 V power… JEE Main 22nd July 2nd Shift 2021
• The value of power dissipated across the zener diode (V_z=15 V) connected in the circuit as shown in the figu… JEE Main 16th March 1st Shift 2021
• In connection with the circuit drawn below, the value of current flowing through 2 kΩ resistor is ×10⁻⁴ A. [F… JEE Main 24th Feb 1st Shift 2021
• The zener diode has a V_z=30 V. The current passing through the diode for the following circuit is mA. [Figur… JEE Main 26th Feb 2nd Shift 2021
• The circuit shown here is working as a 8 V dc regulated voltage source. When 12 V is used as input, the power… JEE Main 9th Jan 2nd Shift 2020