GATE EE 2016 Set 1 — Question 22
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Analog & Digital Electronics → Amplifiers & Feedback → BJT & FET Biasing
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Question
A transistor circuit is given below. The Zener diode breakdown voltage is as shown. Take base to emitter voltage drop to be . The value of the current gain is _________.

Correct answer
18 to 20
Solution
Given (from the circuit): , base resistor , collector resistor , emitter resistor , Zener voltage , Zener current , .Step 1: Base and emitter voltagesThe Zener holds the base at , soStep 2: Emitter currentStep 3: Base currentCurrent through the resistor:Of this, flows through the Zener, soStep 4: Current gain(Check: , so the transistor is in the active region.)Answer: (accepted range 18 to 20)
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