1992
1. The 6 volts Zener diode shown in figure has zero zener resistance and a knee
current of 5 mA. The minimum value of R so that the voltage across it does not
fall below 6 volts is ……
Answer: B
Solution : https://www.youtube.com/watch?v=j45arOd6cYQ
1996
1. A Zener diode in the circuit shown has a knee current of 5 mA, and a maximum
allowed power dissipation of 300 mW. What are the minimum and maximum load
currents that can be drawn safely from the circuit, keeping the output voltage
Vo constant at 6 volts ?
a.
0 mA, 180 mA
b.
5 mA, 110 mA
c.
10 mA, 55 mA
d.
60 mA, 180 mA
Answer: C
Solution : https://www.youtube.com/watch?v=-OlZHuj8cPs
1998
1. In
a series regulated power supply circuit, the voltage gain Av of the
pass transistor satisfies the condition
a.
Av -> ∞
b. 1 << Av < ∞
c.
Av ≡ 1
d. Av << 1
Answer: C
Solution : https://www.youtube.com/watch?v=b3wTRqK2kdc
1999
1. A DC power supply has a no-load voltage of 30 volts, and a full load voltage of
25 volts at a full
load current of one amp. Its output resistance and load regulation,
respectively are
a.
5 Ω and 20
%
b.
25 Ω and 20
%
c.
5 Ω and
16.7 %
d.
25 Ω and
16.7 %
Answer: B
2001
1.
The transistor shunt regulator shown in figure has a regulated output voltage
of 10 volts, when input varies from 20 volts to 30 volts. The relevant
parameters for the zener diode and the transistor are: VZ = 9.5
volts, VBE = 0.3 votls, β = 99. Neglect the current
throught RB. Then the maximum power dissipated in the zener diode (PZ)
and the transistor (PT) are
Answer: C
2002
1. A zener diode regulator in figure, is to be designed to meet the specifications
: IL = 10 mA, Vo = 10 volts and Vin varies
from 30 to 50 volts. The zener diode has VZ = 10 volts and IZK
(knee current) = 1 mA. For satisfactory operation
Answer: A
Solution : https://www.youtube.com/watch?v=OCR60jVExa4
2003
1. The output voltage of the regulated power supply shown in
the figure is
a.
3 volts
b. 6 volts
c.
9 volts
d. 12 volts
Answer: C
Solution : https://www.youtube.com/watch?v=aYqrNc3c4KU
2004
1.
In the voltage regulator shown, the load current can vary from 100 mA to 500
mA. Assuming that the zener diode is ideal (i.e. the zener knee current is
negligibly small and zener resistance is zero in the breakdown region), the
value of R is
Answer:
D
Solution : https://www.youtube.com/watch?v=ow6gYqOD3_w
2005
1.
The zener diode in the regulator circuit shown has a zener voltage of 5.8 volts
and a zener knee current of 0.5 mA. The maximum load current drawn from this
circuit ensuring proper functioning over the input voltage range between 20 and
30 volts is
Answer: A
Solution : https://www.youtube.com/watch?v=QxmLyMhJs6g
2006
Statement
for Linked Answer Questions (1 and 2):
A regulated power supply shown in
the figure below has an unregulated input of 15 volts and generates a regulated
output Vout. Use the component values shown in the figure.
1.
The power dissipation across the
transistor Q1 shown in the figure is
a.
4.8 volts
b. 5.0 volts
c.
5.4 volts
d. 6.0 volts
Answer: D
2. If the unregulated voltage increases by 20%, then power
dissipation across the transistor Q1
a.
Increases by 20%
b. Increases by 50%
c.
Remains unchanged
d. Decreases by 20%
Answer: B
Solution : https://www.youtube.com/watch?v=_fx1s9uTcCw
2011
1.
A Zener diode when used in voltage stabilization circuits, is biased in
a.
Reverse bias region below the breakdown voltage
b.
Reverse breakdown region
c.
Forward bias region
d.
Forward bias constant current mode
Answer: A
Solution : https://www.youtube.com/watch?v=FiBnG4KSEHU
2013
1. 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
2014
1. In the voltage regulator circuit shown in the figure, the
Op-Amp is ideal. The BJT has VBE = 0.7 volts, and β = 100, and the zener voltage is 4.7 volts. For a regulated
output of 9 volts, the value of R (in Ω) is ……..
Answer: 1090
Solution : https://www.youtube.com/watch?v=B5rropdO8jA
2015
Solution: https://www.youtube.com/watch?v=cKkJa1-Kl_U
14. For the voltage regulator
circuit shown,the input voltage (Vin) is 20 V ± 20% and the
regulated output voltage (Vout) is 10 volts. Assume the OP-AMP is
ideal. For a load RL drawing 200 mA, the maximum power dissipation
in Q1 (in Watts) is _________________
Answer: 2.85Solution: https://www.youtube.com/watch?v=cKkJa1-Kl_U
Super ur efforts are appreciated
ReplyDeleteThe more serious the injury or pain, the bigger the braces you need. knee brace for running
ReplyDeleteThese mistakes might be because of thermoelectric counterbalanced voltage in the card and associating cabling, switch film defilement, attractive impedance, or ground circles. high voltage ceramic capacitor
ReplyDeleteAdditionally an ideal capacitor doesn't lose any of the energy provided by the source voltage as it is put away as an electric field between the two plates yet in genuine capacitors power is lost because of this spillage flow and the opposition worth of the plates.
ReplyDeleteElectronic components
This is great.
ReplyDelete