Diodes And Their Applications Practice Questions

Generate GATE-level questions on Diode circuits. Focus on: 1. Diode characteristics and models (Ideal, Practical). 2. Rectifiers (Half-wave, Full-wave, Bridge) and Filter circuits. 3. Clipping and Clamping circuits, Zener diode as voltage regulator.

23 questions · 3 PYQs · 0 AI practice · GATE EE 2027

Q21GATE 2003MCQ

A voltage signal $10\sin \omega t$ is applied to the circuit with ideal diodes, as shown in figure, The maximum, and minimum values of the output waveform $V_{out}$ of the circuit are respectively

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📖 Explanation

Fpr positive cycle , when $V_{\in} \gt 4V$ $(V_{\in} \gt 4V) D_2 ON, D_1 OFF, V_{out}=4V$ where $V_{\in} \lt 4V$ , then $V_{out}=V_{\in}$ because $D_2$ also become (OFF). For negative cycle, when $V_{\in} \lt -4V$ $D_1 \; ON, D_2 \; OFF$ $I=\frac{V_{\in}+4}{20k}$ $but, V_{\in}=-ve$ $\therefore \; I=\frac{-V_{\in}+4}{20}=\frac{-3}{10}mA$ $(\because \text{ for minimum output }V_{\in}=-10V)$ $V_{out}=\frac{-3}{10}\times 10k-4=-7V$

Q22GATE 2002MCQ

The forward resistance of the diode shown in figure is 5 $\Omega$ and the remaining parameters are same as those of an ideal diode. The dc component of the source current is

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📖 Explanation

$V_{av}=\frac{V_m}{\pi}$ $I_{av}=\frac{V_{av}}{R}=\frac{V_{av}}{5+45}=\frac{V_{av}}{50}$ $\;\; =\frac{V_m}{50\pi}$