Diode Applications Practice Questions

All the diodes in the circuit given below are ideal. Which of the following plots is/are correct when $\mathrm{V}_{\text {I }}$ (in Volts) is swept from -M to M ?

As shown in the circuit, the initial voltage across the capacitor is $10 \mathrm{~V}$ , with the switch being open. The switch is then closed at $t=0$ . The total energy dissipated in the ideal Zener diode ( $V_{z}=5 \mathrm{~V}$ ) after the switch is closed (in $\mathrm{mJ}$ , rounded off to three decimal places) is ________

In the circuit shown, the $n: 1$ step-down transformer and the diodes are ideal. The diodes have no voltage drop in forward biased condition. If the input voltage (in Volts) is $V_{s}(t)=10 \sin \omega t$ and the average value of load voltage $V_{L}(t)$ (in Volts) is $2.5 / \pi$ , the value of $n$ is ______

In the circuit shown below, $D_{1}$ and $D_{2}$ are silicon diodes with cut-in voltage of $0.7 \mathrm{~V}$ . $V_{\text {IN }}$ and $V_{\text {OUT }}$ are input and output voltages in volts. The transfer characteristic is

A circuit and the characteristics of the diode (D) in it are shown. The ratio of the minimum to the maximum small signal voltage gain $\frac{\partial V_{out}}{\partial V_{\in}}$ is ________ (rounded off to two decimal places)

An asymmetrical periodic pulse train $v_{\in}$ of $10\:V$ amplitude with on-time $T_{\text{ON}}=1\:ms$ and off-time $T_{\text{OFF}}=1\:\mu s$ is applied to the circuit shown in the figure. The diode $D_{1}$ is ideal. The difference between the maximum voltage and minimum voltage of the output waveform $v_{o}$ (in integer) is ______________ V.

In the circuit shown below, all the components are ideal and the input voltage is sinusoidal. The magnitude of the steady-state output $V_0$ (rounded off to two decimal places) is _________ V.

In the circuit shown, $V_s$ is a 10 V square wave of period, T=4 ms with R= 500 $\Omega$ and C = 10 $\mu F$ . The capacitor is initially uncharged at t=0, and the diode is assumed to be ideal. The voltage across the capacitor ( $V_c$ ) at 3 ms is equal to ____ volts (rounded off to one decimal place).

In thecircuit shown, $V_s$ is a square wave of period T with maximum and minimum values of 8 V and -10 V, respectively. Assume that the diode is ideal and $R_1=R_2=50\Omega$ . The average value of $V_L$ is____ volts (rounded off to 1 decimal place).

In the circuit shown, the breakdown voltage and the maximum current of the Zener diode are 20 V and 60 mA, respectively. The values of $R_1 \; and \; R_L$ are $200\Omega \; and \; 1k\Omega$ , respectively. What is the range of $V_i$ that will maintain the Zener diode in the 'on' state?

A DC current of 26 $\mu A$ flows through the circuit shown. The diode in the circuit is forward biased and it has an ideality factor of one. At the quiescent point, the diode has a junction capacitance of 0.5 nF . Its neutral region resistances can be neglected. Assume that the room temperature thermal equivalent voltage is 26 mV. For $\omega =2 \times 10^{6} \; rad/s$ , the amplitude of the small-signal component of diode current (in $\mu A$ , correct to one decimal place) is _______.

The circuit shown in the figure is used to provide regulated voltage (5 V) across the 1k $\Omega$ resistor. Assume that the Zener diode has a constant reverse breakdown voltage for a current range, starting from a minimum required Zener current, $I_{Z_{min}} = 2 mA$ to its maximum allowable current. The input voltage $V_{I}$ may vary by 5% from its nominal value of 6 V. The resistance of the diode in the breakdown region is negligible. The value of R and the minimum required power dissipation rating of the diode, respectively, are

The output $V_{0}$ of the diode circuit shown in the figure is connected to an averaging DC voltmeter. The reading on the DC voltmeter in Volts, neglecting the voltage drop across the diode, is ____________.

In the figure, D1 is a real silicon pn junction diode with a drop of 0.7V under forward bias condition and D2 is a zener diode with breakdown voltage of -6.8 V. The input [latex ]V_{in}(t)[/latex] is a periodic square wave of period T, whose one period is shown in the figure. Assuming 10 $\tau \lt \lt T$ , where $\tau$ is the time constant of the circuit, the maximum and minimum values of the output waveform are respectively,

The figure shows a half-wave rectifier with a 475 $\mu$ F filter capacitor. The load draws a constant current $I_{o}=1A$ from the rectifier. The figure also shows the input voltage $V_{i}$ , the output voltage $V_{c}$ and the peak-to-peak voltage ripple u on $V_{c}$ . The input voltage $V_{i}$ is a triangle-wave with an amplitude of 10 V and a period of 1 ms. The value of the ripple u (in volts) is ________

The diodes D1 and D2 in the figure are ideal and the capacitors are identical. The product RC is very large compared to the time period of the ac voltage. Assuming that the diodes do not breakdown in the reverse bias, the output voltage $V_{0}$ (in volt) at the steady state is __________

The I-V characteristics of the zener diodes D1 and D2 are shown in Figure I. These diodes are used in the circuit given in Figure II. If the supply voltage is varied from 0 to 100 V, then breakdown occurs in

Assume that the diode in the figure has $V_{on}$ = 0.7 V, but is otherwise ideal. The magnitude of the current $i_{2}$ (in mA) is equal to ________

The diode in the circuit given below has $V_{ON}$ = 0.7 V but is ideal otherwise. The current (in mA) in the $4 k\Omega$ resistor is _______.