Rajasthan Technical University 2011-5th Sem B.Tech Electronics and Communications Engineering telecommunication engg. - Question Paper
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B. Tech. (Sem. V) (Main/Back) Examination, December 2011
Eltctronics & Communication 5EC3 Telecommunication Engg*
[Maximum Marks 80 [Min Passing Marks 24
Time 3 Hours)
Attempt any five questions selecting one question from each unit. All qiiettion* carry equal marks. Schematic diagrams must be shown whtrrter neeewary Any data you feel missing suitably be assumed <md fated < iwirty Units of quantities used/calculated must be utated rtearty
Use of foKowtng supporting material m permitted during examination. (Mentioned in tocr Nc <?05)
1.
NIL
I*-..**
U) Prove that a finite transmission line terminated in iu chaxacttnmc impedance behaves a= a infinite transmission line
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(b) A traaMni.sMo/j line has the following per umt length parameters ft - 5U L 0 1 uH C ~ WO pF <i = 0 01 tuho CaicuiatH th* propagation rontant .uui charaetenauC impvdaucv of th* line -it *00 MHz. obtain th* )U*f purauu'tw* (or th* loMsji-H4 hnr
Oil
(a) Impedance measurement* made on u 0 2 IS km fi#tld quad cable at 1600 Ifc under open and nhori cmun c*nd>Uon*
gave Zlk = 2460 6 3 und lm ~ 215 . 14' f| rwulu Calculate Z0, a.fi and line parameters ptr umt Leaftl) of line,
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% (a) Design ra-denved T-typ# low pass filter to work intolbarf rf 500 Q and cut-off frequency at 4 kHz and peak arteaavtion at%.S kHz
8
fl>) For band pass filter *bow that series and shunt arm waotiant frequency ia the geometric mean of two cut-off frerpiefte*** fj' and *f2 deciding paw band.
8
4 (a) Draw and explain the *ignallmg tones used in telephone.
(b) A lour vnre ur<uit hn an overall loss of 1 dB and the baiaac* return Ion# at ad> pnd w 6 dB Find, the singing potat stability margin and attenuation of talker and listener efao
ft
OK
4 u.* Draw and explain the vsorkmg of electronic telephone system
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(b) Compare TDM and FDM. suggest which multiplexing system berng uwi it) general and why '*
UNIT V
5 <aj Describe trunking diagram t>f 10uoo Un **ihwag*
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% (a) Design ra-denved T-type law pass filter to work intolbarf rf 500 Q and cut-off frequency at 4 kHz and peak arteaavtion at%.S kHz
8
fl>) For band pass filter *bow that series and shunt arm tesotiant frequency ia the geometric mean of two cut-off frequent*** fj' and *f2 deciding paw band.
8
4 (a) Draw and explain the *ignallmg tones used in telephone.
(b) A lour vnre ur<uit ha* an overall loss of 1 dB and the baiaac* return Ion# at "ach pnd w 6 dB Find, the singing potat stability margin and attenuation of talker and listener efao
ft
OK
4 u.* Draw and explain the vsorking of electronic telephone system
*
(b) CiDpare TDM and FDM. suggest which multiplexing system berng used in general and why '*
UNIT V
5 <aj Describe trunking diagram t>f 10IMMi Un* **ihajag*
*
. m stage and multistage 5witrhin#*eW&
m cofflamcation system. .*
W w short o Stowd Control
<b) Dl* th, EPABX to, ulri f e.n.n.micMto system
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| Earning: Approval pending. |
