Download AKTU B-Tech 2nd Sem 2014-15 NEC101 Electronics Engineering Question Paper

Download AKTU (Dr. A.P.J. Abdul Kalam Technical University (AKTU), formerly Uttar Pradesh Technical University (UPTU)) B-Tech 2nd Semester (Second Semester) 2014-15 NEC101 Electronics Engineering Question Paper

Printed Pages : 4 7
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(Following Paper IO and Roll No. to be ?lled in your Answer Book)
PAPER ID : 199226
Roll No.
B. Tech.
(SEM. II) THEORY EXAMINATION, 2014-15
ELECTRONICS ENGINEERING
Tune : 3 Hours} [Total Marks : 70
Now : All questions are compulsory.
l Attempt any four part of the following: 5X4=20
(:1) Draw and explain the working of a Bridge recti?er with
input and output waveforms. Calculate ef?ciency and
ripple factor. ,
(b) Design a voltage regulator that will maintain an output
voltage of 20 V across a l-k?Q load with an input that will
vary betWeen 30 and 50 V. That is, determine the proper
' value of R, and the maximum current IZM
(c) Determine and ?sketch V0 for the given network shown in
Fig.1.
Si 5V
we DP jIIL, ?0
4.11:0
Fig. l
(d) Determine .Vo andrthe required PIV rating of each
diode for the con?guratiOn of Fig.2.
199226] 1 [ Contd...

'1
I00 v
-Inov
. (e) With the help of necessary diagram differentiate
between Half wave and Full wave Voltage doubler.
(1) Sketch V0 for the given network shown in Fig.3 for the
input shoWn
V.
1
2W
- a j
?N . ? _ Fig. 3
2 Attempt any four parts of the following: 5X4=20
(a) Draw the input and. output characteristics of C '
npn transistor con?guration with proper labels.
(b) Explain with the help of necessary diagrams how -
FET can be used as VVR.
(c) Determine 2,,ZO,V0 for the network of Fig.4 if V, = 20mV
199226]
[ Contd...
(d) For the common emitter or ?xed bias con?guration in
Fig. 5, Determine re, 21-, 20, Av
' ' Isv
Fig. 5
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(e) Explain the construction and working of 11 channel depletion
type MOSFET. '
(t) Derive the stability factor 80%) for the Fixed bias
' con?guration.
3 , Attempt any_ two parts of the following: 10x2=20
(a) Explam:
(i) Di??erentiator circuit using Op-Amp.
(ii) Non-Inverting ampli?er using Op-Amp.
(iii) Di?'erential Ampli?er using BJT with two modes of
operation. '
(b) d) Draw the circuit of an Op-Amp as voltage follower
and ?nd an expression for its voltage gain.
(ii) Determine the output?voltage for the given
circuit shown in Fig. 6.
mm
W?
I? m
V;- 3 V ?""?.v '
7?! ? 7.
IBM
10m
Fig.5
199226] 3 [ Contd...

(C)
(a)
(b)
(0)
De?ne Op-Amp with the help of block diagram. Also
describe the equivalent circuit along with its ideal
and practical characteristics.
Attempt any two parts of the following 10X2=20
Explain the basic principle of digital voltmeter with
the help of block diagram. What are the
characteristics of DVM?
(i) Explain how frequency and phase can be
measured using CRO.
(ii) ? Explain working principle of Digital multimeter
with the help of suitable Block diagram.
Draw a neat block diagram of a cathode ray oscilloscope
with proper labels. Also explain its working principle.
5 Attempt any two parts of the following: - 10X2=20
(a)
(b)
(0)
199226]
(i) What are the needs of modulation? Explain.
6i) Explain with the help of block diagram the
elements of cOmmunication systems.
What do you understand by modulation? Explain
various modulation techniques. Also explain the
demodulation technique of AM with the help of
necessary diagram
(1) What do you understand by signal? De?ne various
types of signals with suitable examples.
(ii) The antenna current of an AM transmitter 8
Amperes, when only the carrier is_ sent, but it
increases. to 8.93 Amperes when the carrier is
modulated by a single sine wave. Find 'the %
modulation. Determine the antenna Current when
the % of modulation changes to.0.8.
4 - [44900].