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JEE Main 2019 (12 Apr, Shift 2) · Special Purpose Diodes

Special Purpose Diodes question from JEE Main 2019 (12 Apr, Shift 2)

Q80JEE Main 2019 · 12 APR · SHIFT 2Medium

Special Purpose Diodes

Figure shows a DC voltage regulator circuit, with a Zener diode of breakdown voltage = 6V. If the unregulated input voltage varies between 10 V to 16 V, then what is maximum Zener current?

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Answer: (a)

Zener current is largest at the largest input, $16$ V.
$I_s = \frac{16 - 6}{2\text{ k}\Omega} = 5$ mA
$I_L = \frac{6}{4\text{ k}\Omega} = 1.5$ mA
$I_{Z,max} = 5 - 1.5 = 3.5$ mA, so the answer is (a).

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