RTU 2016 Question Paper Semester VIII Electronic Instrumentation and Control Engineering Old Wireless Communication

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!+ & Controt Engineering
Electronics Instrumentation
Fd 8814.1 (0) Wireless
Comrnunication
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Maxinnum Marks :
80
Time : 3 Hours Mi;. Passing Marks : 24
Instructions to Candidates: tn from each unit. All
questions
selecting one auestll
Atternpt any live qwestions' mus,t bL shawn wherever
necessary'
(schematfc diigrami
carry equal'*oriu, o"u*ud oncl stated clearly'
missing
Any data you feel '.'i;;;';" clearly'
' Utrits of quoii'i"' "'diolculatid must be stated
Unit - I
with a radar
;#&;;:l'lli:''
range il;00
@-band)" Its maximum
i6itr," ;i
l.Agroundbasedair.surveillanceradar.oper.atesataf,requencyof1300MHz.

crosssectionofonesquaremeter(o=!mz).]$antennaisl2mwideby4mhigh, detectable
pu=0'65 ' The reeeiver minimum
andthe antennaaperture effreiency is
the fotlowing
signal is S,,,-:10-iw' Determine -+^*\ .'nr{ ,}ntenna
DAnterrnaeffectiveapertureA.(squaremeter)andantennagainGr,ll-'here {3}
G{dB)= 1o logro G (as a
numeric) (3)
ii) ranse of 200
to acrrieve a maximurn unambiguous
iii) ffix*uT;::-#il::cy (3)
ffm (3)
puise width is 2 ps
iv) Average ffatrsrnitted power' if the (2)
r) Duty cYcle (2)
vi] Horizontalbeanrwidth

OR
radar cross
nmi); experimentatrly measured
x.T}rernoonasaradartar8etauJb.*{.scribedas^follows;Averagedistancetothe
Zdg.0'00
moCIn is 3.8aa*iO**.{36."*t over a frequencies); and its
(mean value 'u"g* "TtJoi'
seciion is 6.64x1ilir1#
r*Cius is t.?38x i{i{'ttt

[Cont..
(1)
8E 4099 /*r

D what is the round trip time in second of radar pulse to the moon and back(4) .
ii) What should the pulse repetition fiequency(prf) be in order to have no range
u*ulguiti.s ' ' (4)
iii) For the purposo of probing the nature of the moon's surface, a much higher
ilf ;;;lld-U-" if,* itrit foona i" Q). How high could the prf be if the ()
;rtd;1. to "r.a
oUt**. the echoes from'.the moon's front half ?
lv) If an antenna with a diameter of 60ft and aperture efficiency.of 0.6 were used
ut u fr"ruency of ilO Wtlr. With a ,".eiir". having a minimum detectable
- (4)
;ts;;i;} G;rfllevg, what peak power is required
Unit - II
(8)
7 a) Explain the Kepler's three laws of planetary motion
(4+4=8)
b) Explainthefollowing:
D Elevationangle
ii) Azimuth angle
OR
(16)
2. Explain all orbitat effects in communication system perfonnance
Unit - III
(15)
3. Exptain alt the satellite subsystems withneat diagram
OR
3. Explainthe following
(8)
a) DAMA
b) A satellite transponder has a bandwidth of 36 lVlllz. Earth stations use RRC
this
filters with a = O.O . What is the maximum bit rate that can be sent through
transponder with
(4)
D BPSK
ii) QPSK
(4)
Unit - IV
4. Given a cellular system in which there are a total of 100i radio channels availa'oie
for handling tialiic. It is also given that the area of a cell is 6kmz and the area of
the entire system is 2100 km2
(4)
D Calculate the system capaeity if the cluster size is 7
ii)
-/ How many times would the cluster of size 4 have to be replicated in order
uppio*i*it"Lycovertheentirecellular area? (4)
iii)Calculate the system capacity ifthe cluster size is 4 (4)
the cluster size increase the system capacity? Explain'
(4)
lv) Does decreasing

8E 4099 Q)

,oR
4. Explain:
a) Adjacent channel lnterference
(8)
b) Co-channellnterference
(8)
Unit - V
5' a) Qompale PCs and cellular telephony
----J in rvr,re vr
^-4 terms of frequency,
channgl capacity ' 'wY*vrtvy' bandwidth
u and
b) Explain the personal communication
[li
oR
5. E4plain:
a) Concept of GSM
(8)
b) DECT standard
(8)

8E 4099
(3)