Download AKTU B-Tech 2nd Sem 2015-16 201NEC 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) 2015-16 201NEC Electronics Engineering Question Paper

Printed Pages: 6 NEC-ZOI/NEC-IOI
(Following Paper ID and Roll No. to be ?lled in your
Answer Books)
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B.TECH.
Theory Examination (Semester-II) 2015-16
ELECTRONICS ENGINEERING
Time : 3 Hours Max. Marks : 100
Section-A
Q1. Attempt all questions. (2X10=20)
(a) Describe breakdown mechanisms of diode.
(b) Calculate the dynamic forward and reverse resistance
of pn junction diode when the applied voltage is 0.50
V at temperature of 120degree Celsius and
reverse saturation current of 5 microampere.
(c) Explain why BJT is bipolar device.
(d) Explain FET as voltage variable resistor.
(1) 13.110.
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(e)
(f)
(g)
(h)
(i)
(1')
An operational ampli?er has a differential gain of 103
and CMRR of 100, input voltages are IZOuV and 80p.V,
Determine output voltage.
List the ideal characteristics of OP-AMP.
Explain signals and what are its types.
A 400 Watt carrier is modulated to a depth of 75%.
Calculate total power in modulated wave.
Explain the role of trigger circuit in CR6.
Draw the lissajous pattern for fv=3t;.
Section-B
Q2. Attempt any ?ve parts from the following. (10X5=50)
(a)
Sketch and ?nd output voltage of the circuit:
(i)
?1?!!!
(2)
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(ii) Sketch and ?nd output voltage of the circuit,
when peak value of input voltage is 10V
(b) Explain the block diagram of communication
system. What is modulation and why it is required.
(c) What is transistor biasing. Why is it required.
Explain ithe various schemes of transistor biasing.
(d) (i) Determine IC and VCE of the circuit
510? 35
(ii) Draw the input and output characteristics of
common base con?guration.
(3) P.T.O.
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(e) (i) Find output voltage of the op-amp
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5 ID I
V. ?> V.
V, +
5 K0
IKO
(ii) Find output voltage of the op-amp
20K
0.] V o-??vw?-
- 19 K I00 I(
0.1 V ? jV,"g 11;;?
50 K
0.3 V W9 -
H y
F'
(f) Explain the following:
(a) Voltage Follower
(b) Non inverting ampli?er
(c) Differential amplifier in two modes of
operation
(g) With the help of block diagram explain the working
of digital multimeter.
(4)
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(b) With the help of block diagram explain the working
of CRO.
Section-C
(ATTEMPT ANY TWO QUESTIONS) (15x2=30?)
Q3. (a) Explain full wave recti?er with circuit diagram. Also
?nd ripple factor for it.
(b) Explain voltage multipliers.
(c) Explain di??erence between LCD and LED.
Q4. (a) Explain the construction, working and characteris-
tics of Depletion type MOSFET.
(b) Determine IC,IB,VC,VCE,VB for the circuit, given
R1=82KQ, 1g=16m,
Rc=2.2KQ,RE=0.75KQ,B=220
(5) P.T.O.
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(c) For the given zener diode network determine
VL?VR?IL?IR
I, x
M?? 1
. um E ?
rpm K?lW 3E Rl'um
PfSOmW
Q5. (a) Calculate the percentage saving when the carrier and
one of the sidebands are suppressed in AM
modulated wave to a depth of (a)100% and (b)50%.
(b) In an FM system when the audio frequency is (AF)
is 500Hz and the AF voltage is 2.4V,deviation is
4.8KHZ.If the AF voltage is now increased to
7.2v,what is the new deviation? If the AF voltage is
raised to 10V while the AF is dropped to 200Hz,what
is the deviation? Find modulation index in each case.
(0) Explain frequency measurement using lissajous
pattern.
(6)
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