GATE EE 2026 Set 1 — Question 33
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Analog & Digital Electronics → Diode Circuits → Zener Regulator
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Question
In the linear regulator circuit shown, the base to emitter voltage of the BJT is . The Zener diode clamps the base voltage to . Ignore the biasing current of the Zener diode and BJT.The maximum possible efficiency of the regulator circuit is ___________ % (Round off to one decimal place)
Correct answer
47.5 to 48
Solution
1.Determine the output voltage ():
The base voltage is clamped by the Zener diode to .The output voltage is the emitter voltage of the BJT:
2.Calculate the output power ():
Given the load current :3.Calculate the input power ():
The input voltage . The total input current consists of the load current and the current through the biasing resistor .- Current through the resistor: .
- If we include : .
- If we strictly follow "ignore biasing current" to mean the entire branch current is negligible compared to :
4.Conclusion:
Both interpretations fall within the official range of to . Rounding to one decimal place, the answer is or .Continue learning with Success Tracker
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