Download AKTU B-Tech 5th Sem 2016-2017 Principles Of Communication Nec 502 Question Paper

Download AKTU (Dr. A.P.J. Abdul Kalam Technical University (AKTU), formerly Uttar Pradesh Technical University (UPTU) B-Tech 5th Semester (Fifth Semester) 2016-2017 Principles Of Communication Nec 502 Question Paper

Printed Pages: 3 NEC -502
(Following Paper ID ahd Roll No. to be filled in your
Answer Books)
Roll No.
B.TECH
Regular Theory Examination (Odd Sem-V), 2016-17
PRINCIPLES OF COMMUNICATION
T ime : 3 Hours Max. Marks .' 100
SECTION -A
1. Attempt all parts. All parts carry equal marks. Write
answer of each part in short. (l0><2=20)
a) Compare Baseband and Passband signal.
b) How to generate a Television signal. _
0) Write down the bandwidth of AM-DSB-FC,
AM-DSB-SC?AM?SSB andAM-VSB.
d) Differentiate between frequency and phase
modulation.
e) De?ne Line coding with an example.
D How to avoid aliasing effect in a sampled signal?
g) Why thermal noise act as an important factor
affecting output power in PCM technique.
502/12/2016/6300 (1) [p.m.

h)
1)
NEC - 502
Calculate the power spectral density of noise in
Linear ?lter.
Mention the uses of a limiter-discriminator in F M
Demodulation.
Name and Draw the various artificial spike
responses of a PLL.
SECTION - B
NotezAttempt any ?ve parts from this section. (5X10=50)
2. a) Draw a block representation of a Super hertodyne
AM receiver, and explain the function of IF
ampli?er. 4
b) Derive the power calculation of AM signal.
0) Represent a binary data1010101111111110101
using Manchester code. AMI code and Bipolar R2.
(1) _ Summarize the sampling process of a signal with
mathematical expressions.
e) How to generate PPM from PWM signal? Explain
with proper waveforms.
1?) Design a FM modulation system, whose
ff =961W-12Af = 75kl /KHZ to broadcast an audio
signal of frequency fm = 50Hz. Using Amstrong?s
Indirect method.
502/12/2016/6300 (2)
g)
h)
NEC -502
Write a technical note on TDM for T1 system, with
the help of a neat diagram.
Show the response of baseband signal for delta and
adaptive delta modulation.
SECTION - C
Note: Attempt any two Questions from this section.
(2x15=30)
3. Explain the concept AM-SSB modulation and
demodulation with the help of neat diagram and
mathematical analysis for coherent detection.
4. Describe the sampling techniques and signal recovery
through holding used in PAM
5. a)
b)
Derive the spectral components of Noise. (5)
Illustrate the uses of PLL in the digital data
transmission. (10)
.V..\
/\
/.-\/..V.
\ /\ /\
502/12/2016/6300 (3)