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GATE EC 2014 Set 1 — Question 47

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NAT+2 / -0HardVoltage RegulationDiode CircuitsAnalog CircuitsIdeal & Non-Ideal Op-AmpOp-Amp Circuits

Analog Circuits → Diode Circuits → Ideal & Non-Ideal Op-Amp

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Question

In the voltage regulator circuit shown in the figure, the op-amp is ideal. The BJT has VBE=0.7 VV_{BE} = 0.7\text{ V} and β=100\beta = 100, and the zener voltage is 4.7 V4.7\text{ V}. For a regulated output of 9 V9\text{ V}, the value of RR (in Ω\Omega) is _______.
A voltage regulator circuit featuring an ideal op-amp, a BJT, a Zener diode, and several resistors.
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