Diode Circuits and Applications
Practice QuestionsMarks 1
1
For the circuit shown below with ideal diodes, the output will be
GATE EE 2022
2
For the circuit shown in the figure below, assume that diodes $${D_1},\,{D_2}$$ and $${D_3}$$ are ideal.
The $$DC$$ components of voltages $${v_1}$$ and $${v_2},$$ respectively are
GATE EE 2017 Set 1
3
In the following circuit, the input voltage $${V_{in}}$$ is $$100\sin \left( {100\pi t} \right).$$ For $$100\pi RC = 50,$$ the average voltage across $$R$$ (in volts) under steady-state is nearest to
GATE EE 2015 Set 2
4
The sinusoidal ac source in the figure has an rms value of $${{20} \over {\sqrt 2 }}\,V.$$ Considering all possible values of $${R_L},\,\,$$ the minimum value of $${R_s}$$ in $$\Omega $$ to avoid burnout of the Zener diode is ______.
GATE EE 2014 Set 2
5
The figure shows the circuit of a rectifier fed from a 230 V (rms), 50Hz sinusoidal voltage source. If we want to replace the current source with a resistor so that the rms value of the current supplied by the voltage source remains unchanged, the value of the resistance (in ohms) is __________ (Assume diodes to be ideal)
GATE EE 2014 Set 1
6
The $$i$$-v characteristics of the diode in the circuit given below are
$$$i = \left\{ {\matrix{
{{{v - 0.7} \over {500}}A,} & {v \ge 0.7\,V} \cr
{0A,} & {v < 0.7\,V} \cr
} } \right.$$$
The current in the circuit is
GATE EE 2012
7
Assuming that the diodes an ideal in the given circuit, the voltage $${V_0}$$ is
GATE EE 2010
8
The following circuit has a voltage source $${V_s}$$ as shown in the graph. The current through the circuit is also shown
The element connected between $$' a '$$ and $$' b '$$ could be
GATE EE 2009
9
The equivalent circuits of a diode, during forward and reverse biased conditions are shown in figure.
(a)
(b)
(a)
(b)
If such diodes are used in the clipper circuit of figure given above, the output voltage (V0) of the circuit will be
GATE EE 2008
10
What are the states of the three ideal diodes of the circuit shown in figure?
GATE EE 2006
11
Assume that $${D_1}$$ and $${D_2}$$ in figure are ideal diodes the value of current $${I_s}$$ is
GATE EE 2005
12
The current through the zener diode in the given circuit is
GATE EE 2004
13
The forward resistance of the diode shown in figure is $$5\Omega $$ and the remaining parameters are same as those of ideal diode. The $$DC$$ component of the source current is
GATE EE 2002
14
The cut in voltage of both Zener diode $${D_z}$$ and diode $$D$$ shown in Figure is $$0.7$$ $$V,$$ while break down voltage of the zener is $$3.3$$ $$V$$ and reverse breakdown voltage of $$D$$ is $$50$$ $$V.$$ the other parameters can be assumed to be the same as those of an ideal diode. The values of the peak output voltage ($${V_0}$$) are
GATE EE 2002
15
The colour code of a $$1k\Omega $$ resistance is
GATE EE 1999
16
As temperature is increased, the voltage across a diode carrying a constant current.
GATE EE 1999
17
The mobility of an electron in a conductor expressed in terms of
GATE EE 1999
18
In the following circuit the $$5$$ $$V$$ zener diode requires a minimum current of $$10$$ $$mA.$$ For obtaining a regulated output of $$5V,$$ the maximum permissible load current $$\left( {{{\rm I}_L}} \right)$$, is ______$$mA$$ and the minimum power rating of zener diode is ________ $$W$$.
GATE EE 1992
Marks 2
1
In the given circuit, the diodes are ideal. The current I through the diode D1 in milliamperes is _____ (rounded off to two decimal places).
GATE EE 2024
2
All the elements in the circuit shown in the following figure are ideal. Which of the following statements is/are true?
GATE EE 2023
3
The Zener diode in circuit has a breakdown voltage of 5 V. The current gain $$\beta$$ of the transistor in the active region in 99. Ignore base-emitter voltage drop $$V_{BE}$$. The current through the 20 $$\Omega$$ resistance in milliamperes is ___________ (Round off to 2 decimal places).
GATE EE 2023
4
Assuming the diodes to be ideal in the figure, for the output to be clipped, the input voltage $${V_i}$$ must be outside the range
GATE EE 2014 Set 2
5
A voltage $$1000\sin \omega t$$ Volts is applied across $$YZ.$$ Assuming ideal diodes, the voltage measured across $$WX$$ in Volts is
GATE EE 2013
6
In the circuit shown below, the knee current of the ideal Zener diode is $$10$$ $$mA.$$ To maintain $$5 V$$ across $${R_L}$$, the minimum value of $${R_L}$$ in $$\Omega $$ and the minimum power rating of the Zener diode in $$mW$$ respectively are
GATE EE 2013
7
A clipper Circuit is shown below
Assuming forward voltage drops of the diodes to be $$0.7V,$$ the input-output transfer characteristics of the circuit is
GATE EE 2011
8
In the voltage doubler circuit shown in figure, the switch $$' S '$$ is closed at $$t=0$$. Assuming diodes $${D_1}$$ & $${D_2}$$ to be ideal, load resistance to be infinite and initial capacitor voltages to be zero, the steady state voltage across capacitors $${C_1}$$ & $${C_2}$$ will be
GATE EE 2008
9
Assuming the diodes $${D_1}$$ and $${D_2}$$ of the circuit shown in the figure to be ideal ones, the transfer characteristics of the circuit will be
GATE EE 2006
10
Assuming that the diodes are ideal in figure the current in the diode $${D_1}$$ is
GATE EE 2004
11
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 of the circuit are respectively
GATE EE 2003
12
A diode whose terminal characteristics are related as $${i_D} = {{\rm I}_S}\,{e^{{V \over {{V_T}}}}},\,$$ where $${{\rm I}_S}$$ is the reverse saturation current and $${V_T}$$ is thermal voltage ($$25$$ $$mV$$) is biased at $${i_D} = 2\,mA.$$ Its dynamic resistance is _______.
GATE EE 2002
13
In the single phase diode bridge rectifier shown in the figure, the load resistor is $$R = 50\,\Omega .$$ The source voltage is $$V=200$$ $$sin$$ $$\omega t,$$ where $$\omega = 2\pi \, \times \,50\,rad/sec.$$ The power dissipated in the load resistor $$R$$ is
GATE EE 2002
14
Figure shows as electronic voltage regulator the zener diode may be assumed to require a minimum current of $$25$$ $$mA$$ for satisfactory operations. The value of $$R$$ required for satisfactory voltage regulation of the circuit is
GATE EE 1991
