**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 ……

**A**

**nswer:**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

**A**

**nswer:**C

**Solution :**

**https://www.youtube.com/watch?v=-OlZHuj8cPs**

**1998**

1. In
a series regulated power supply circuit, the voltage gain A

_{v}of the pass transistor satisfies the condition
a.
A

_{v}-> ∞
b. 1 << A

_{v}< ∞
c.
A

_{v}≡ 1
d. A

_{v}<< 1**A**

**nswer:**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 %

**A**

**nswer:**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: V

_{Z}= 9.5 volts, V_{BE}= 0.3 votls, β = 99. Neglect the current throught R_{B}. Then the maximum power dissipated in the zener diode (P_{Z}) and the transistor (P_{T}) are**A**

**nswer:**C

**2002**

1. A zener diode regulator in figure, is to be designed to meet the specifications
: I

_{L}= 10 mA, V_{o}= 10 volts and V_{in}varies from 30 to 50 volts. The zener diode has V_{Z}= 10 volts and I_{ZK}(knee current) = 1 mA. For satisfactory operation**A**

**nswer:**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

**A**

**nswer:**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

**A**

**nswer:**

**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

**A**

**nswer:**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 V

_{out}. Use the component values shown in the figure.
1.
The power dissipation across the
transistor Q

_{1}shown in the figure is
a.
4.8 volts

b. 5.0 volts

c.
5.4 volts

d. 6.0 volts

**A**

**nswer:**D

2. If the unregulated voltage increases by 20%, then power
dissipation across the transistor Q

_{1}
a.
Increases by 20%

b. Increases by 50%

c.
Remains unchanged

d. Decreases by 20%

**A**

**nswer:**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

**A**

**nswer:**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 R

_{L}, the minimum value of R_{L}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 V

_{BE}= 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 ……..

**A**

**nswer:**1090

**Solution :**

**https://www.youtube.com/watch?v=B5rropdO8jA**

**2015**

14. For the voltage regulator
circuit shown,the input voltage (V

_{in}) is 20 V ± 20% and the regulated output voltage (V_{out}) is 10 volts. Assume the OP-AMP is ideal. For a load R_{L}drawing 200 mA, the maximum power dissipation in Q_{1}(in Watts) is _________________**A**

**nswer:**2.85

**Solution:**https://www.youtube.com/watch?v=cKkJa1-Kl_U

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