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GATE EC 2015 Set 2 — Question 51

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NAT+2 / -0MediumThevenin & Norton TheoremsCircuit Fundamentals & TheoremsNetwork Theory

Network Theory → Circuit Fundamentals & Theorems → Thevenin & Norton Theorems

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Question

For the voltage regulator circuit shown, the input voltage (VinV_{in}) is 20 V±20%20\text{ V} \pm 20\% and the regulated output voltage (VoutV_{out}) is 10 V10\text{ V}. Assume the opamp to be ideal. For a load RLR_L drawing 200 mA200\text{ mA}, the maximum power dissipation in Q1Q_1 (in Watts) is ______.
Series regulator: pass transistor Q1 from V_in to V_out; op-amp with +input at V_ref = 4 V and -input at the junction of divider R1 (top) and R2 = 10 kOhm (bottom) across the output; op-amp output drives the base of Q1; load R_L across the output
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