1990
1. For the same a.c. voltage and load impedance, which of the
following statements about rectifier are correct?
a.
The average load current in a full
wave rectifier is twice than in a half wave rectifier
b. The average load current in a full wave rectifier is n times
that in a half wave rectifier
c.
Half wave rectifier will have a
bigger sized transformer compared to full wave rectifier
d. Half wave rectifier will have a small sized transformer
compared to full wave rectifier
Answer: A & D
1994
1. A Ramp voltage v(t) = 100t volts is applied to a RC
differentiating circuit with R = 5 kΩ and C = 4 µF.
The maximum output voltage is ______
a.
0.2 volts
b. 2.0 volts
c.
10.0 volts
d. 50.0 volts
Answer: B
2. A pulse having a rise time of 40 nsec is displayed on a CRO
of 12 MHz bandwidth. The rise time of the pulse as observed on the CRO would be
approximately equal to ____________
Answer: 49.5 nsec
1996
1. In the circuit of the given figure, assume that the diodes
are ideal and the meter is an average indicating ammeter. The ammeter will read
________
Answer: D
1997
1. A half wave rectifier uses a diode with a forward resistance
Rf. The voltage is Vmsinωt and the load resistance is RL. The DC current
is given by
Answer: B
Solution : https://www.youtube.com/watch?v=boqmSFp0yRQ
1998
1. For
full wave rectification, a four diode bridge rectifier is claimed to have the
following advantages over a two diode circuit:
1. Less expensive transformer
2. Smaller size transformer, and
3.
Suitability for higher voltage
application.
Of
these,
a.
Only 1 and 2 are true
b. Only 1 and 3 are true
c. Only 2 and 3 true
d. 1, 2 as well as 3 are true
Answer: A & D
Solution
: https://www.youtube.com/watch?v=Vkk-TUzCbJA
2. For
small signal ac operation, a practical forward biased diode can be modeled as
a.
Resistance and capacitance in series
b.
Ideal diode and resistance in
parallel
c.
Resistance and ideal diode in series
d.
Resistance
Answer: D
Solution
: https://www.youtube.com/watch?v=DcIc-DoZIvY
3. For
the circuit shown,
a. Draw the transfer characteristics if both diodes D1
and D2 are ideal.
b. How would the characteristics change, if D2 is
ideal but D1 is non-ideal? Assume D1 has forward
resistance of 10 Ω
and a reverse resistance of infinity.
2000
1. a.
For the circuit shown, plot Vo under steady state conditions, with
and without capacitor C. Assume that the diode is ideal.
Answer: With Capacitor, circuit acts as Envelope Detector and With out capacitor, circuit acts as clipper which clips negative half cycle.
Solution: https://www.youtube.com/watch?v=GJXs26_62eE
b. Design a circuit using two ideal diodes, one resistor and two voltage sources that would convert the input voltage to the output voltage as shown in figure. The resistor value need not be specified.
2002
1. A
triangular voltage waveform Vi(t) is applied at the input to the circuit
shown. Assume the diodes to be ideal.
a. Determine the output Vo(t)
b. Neatly sketch the output waveform superimposed on the input
Vi(t) and label the key points.
2003
1. The circuit shown in the figure is best described as a
a.
Bridge rectifier
b. Ring modulator
c.
Frequency discriminator
d. Voltage doubler
Answer: D
Solution : https://www.youtube.com/watch?v=jINTo6uHBDA
2004
1. In the full wave rectifier using two ideal diodes, Vdc
and Vm are the dc and peak values of the voltage respectively across
a resistive load. If PIV is the peak inverse voltage of the diode, then the
appropriate relationships for this rectifier are
Answer: B
Solution : https://www.youtube.com/watch?v=bN5s61Q90RE
2005
1. A square pulse of 3 volts amplitude is applied to RC circuit
shown in figure. The capacitor is initially uncharged. The output voltage Vo
at time t = 2 sec is
a.
3 volts
b. – 3 volts
c.
4 volts
d. – 4 volts
Answer: B
2011
Statement
for linked answer Questions (1 and 2):
In the circuit shown below, assume
that the voltage drop across a forward biased diode is 0.7 votls. The thermal
voltage VT = KT/q = 25 mV. The small signal input vi =
100 cos(ωt)
mV.
1. The bias current IDC through the diodes is
a.
1 mA
b. 1.28 mA
c.
1.5 mA
d. 2 mA
Answer: A
2. The ac output voltage VAC is
a.
0.25 cos(ωt) mV
b. 1 cos(ωt)
mV
c.
2 cos(ωt) mV
d. 22 cos(ωt)
mV
Answer: B
Solution : https://www.youtube.com/watch?v=s3I6VcArveo
2013
1. A voltage 1000sinωt volts is applied across YZ. Assuming ideal diodes, the
voltage measured across WX in volts is
a.
Sinωt
b. (Sinωt
+ |Sinωt|)
/ 2
c.
(Sinωt - |Sinωt|)
/ 2
d. 0 for all t
Answer: D
Solution : https://www.youtube.com/watch?v=gy9k16uKPDk
2. In the circuit shown below, the knee current of ideal zener
diode is 10 mA. To maintain 5 volts across the load RL, the minimum
value of RL in Ω’s
and the minimum power rating of the zener diode in mW respectively are
a.
125 and 125
b. 125 and 250
c.
250 and 125
d. 250 and 250
Answer: B
Solution : https://www.youtube.com/watch?v=_QUM3VQQ78I
2014
1. In the figure, assume that the forward voltage drops to the
PN diode D1 and Schottky diode D2 are 0.7 volts and 0.3
volts respectively. If ON denotes conducting state of the diode and OFF denotes
the non conducting state of the diode, then in the circuit,
a.
Both are ON
b. D1 is ON and D2 is OFF
c.
Both are OFF
d. D1 is OFF and D2 is ON
Answer: D
2. The diode in the circuit shown, if Von = 0.7
volts but is ideal otherwise. If Vi = 5 sin(ωt) volts, the minimum and maximum values of Vo
(in volts) are, respectively,
a. -5 and 2.7
b. 2.7 and 5
c.
-5 and 3.85
d. 1.3 and 5
Answer: C
Solution : https://www.youtube.com/watch?v=VNI1bsbW2i8
3. The figure shows a half wave rectifier. The diode D is
ideal. The average steady state current (in Amperes) through the diode is
approximately…………
Answer: 0.09
Solution : https://www.youtube.com/watch?v=vubUa_xDnIk
4. Two silicon diodes, with a forward voltage drop of 0.7
volts, are used in the circuit shown in the figure. The range of input voltage
Vi for which the output voltage Vo = Vi, is
a.
-0.3 volts < Vi < 1.3 volts
b. -0.3 volts < Vi
< 2 volts
c.
-1.0 volts < Vi < 2.0 volts
d. -1.7 volts < Vi
< 2.7 volts
Answer: D
2015
1. If the circuit shown
has to function as a clamping circuit, then which one of the following conditions
should be satisfied for the sinusoidal signal of period T?
Answer: D
Solution: https://www.youtube.com/watch?v=POqJ5VOSIdk
Solution: https://www.youtube.com/watch?v=POqJ5VOSIdk
thank u so much sir.
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