- Information
- AI Chat
Past year questions of Prop. & Antenna for BEI and BEX Institute of Engineering
Computer Engineering (CSE123)
Tribhuvan Vishwavidalaya
Recommended for you
Preview text
TRIBHUVAN LNIVERSITY INSTITUTE OF ENGINEERING
Examination Control Division
####### 2079 Chaitra
Subiec!:- Prcpagation and Antenna (,EX 653)
'/ Candidates are requirecl to give their answers in their or rvords as far as practicatrie.
'/ Attenrytt All questions.
'/ The Jigure in the margin indicate Fall Marks.
'/ Assume suitable data if necesslrt,
1. What is an antema? Expiain the different conditions lbr a simple conductor to be a good
antenna. l2+4)
2, State the fbllouing antenlla theorem: (a) fhevenin ibl Re ciprt,citr I,r-3]
3. Erplain the ibllou il1g pafameters of aI'iteni1a: i3*3-3]
a) Directivit,v (b) Poiarizatron (c) Input impedance
4. Derive an expression for the total field in case of two isotropic poinl. sources rvith equal
amplitude and opposite phase [8l
5. Expiain the working principle" characteristics, advantage of a rhombic antcirna and its
applications. t7l
6. Expiail in iietail about the operatii,n of o3t'rti-rl,c iellcc':,tt' \'ititt is Cir-sseqrain feecl
sy'stem? [5+3]
7. Fincl the received power in dB at a distance o1' 50 km o\ier a fiee space with 10 Cfiz
fiequency consisting of transmitting antenna rvith 25 dB gain and a rcceiving gain of 20
dB. The polvel radiated b5, transmitting antenna is 150 tlB. t5]
8. Describe nrultiple trI0i) and explain horv attnr:spberic dncts oan be r-tsed for rnicro'wave
propagation. 12+6]
9. Derive the expression between skip distance and nrarimum useable irecluenc"v $Uf)
assuming earths curvature.
10. Explain about the pr:incipie of light propagation in opticai flber:. Define nurnericai
apefiure, anil acceptance angle ivith nccessar:y figulcs and mathcmatical expressions. 12+2*2)
i 1. Write short notcsi on: (An-v Three)
a) Knitb edge diffraction
b) Splicing
c) Horn Antenna.
d) Opticai fiber loss
e) Iv{icrostr:ip antenna
[3 x3] t7l Exarn.
Level BE Full Marks 80
Programme BEI, BEX Pass {arks 32
Ycar / Fart ItrI i lI Tirne 3 hrs.
***
TRTBHWAN I-INTVERSITY
INSTITUTE OF ENGINEERING
Examination Control Division
2078 Chaitra
ti_on and t"r"iii rzx ii;l^*
as practicable.
,/ Candidates are required
to give their answers in
/ Anempt Ailquestions.
/ Assume suitable data if necessary.
1' Define antenna' Explain the radiation mechanism in
single wire antenna.
travelling wave long wire antenna with required diagrams.
2. State the following antenna theorem:
a) Compensation theorem
b) Reciprocity theorem
Write the features of end-fire array.
Explain
[2+3-r-3J
l2+2+4)
t8l
i8l
[4+4]
[8]
3. Explain the construction, working principle and characteristics
of Rhombic antenaa with
necessary diagram.
4' ExpJain the special features of reflector antenna and discuss
on different types of feed
used with necessary diagrams.
5'
lelcribe briefly the structure of the ionosphere and its uses for radio frequency spectrum.
Write the characteristics of ground warre propagation.
6' Derive the formula for maximum usable frequency and skip distance assuming earth is
perfectly flat.
7.
8.
A free space LOS (Line of Sight) microwave link operating at 10
GHz consists of a
transmit anci receive antenna each having gain of 2s dg. Catulate ttre pattr
toss of the
link and received power for 100 Km distance. Derive Friis transmission
equation. [5+3]
What is acceptance angle? Derive the expression for Nrunerical Aperfure
with neat
diagram.
g3*5]
9' Explain the block diagram of optical communication system. State
advantages and
applications of optical fiber compared to microwave communication link.
[3--4]
10. Write short notes on (Any Three) :
[3x3J
a) Effective antenna height
b) Firesnel Zones
c) Microstrip antenna
d) Radio frequency spectrum
Programme BEi, BEX Pass Marks 32
Year I Part lti I ii
TIffiffiARY
***
Exam.
Level BE , tr'ull Marks , 80
Time I 3
TRIBHUVAN UNIVERSITY INSTITUTE OF ENGINEERING
Examination Control Division
2076 Baisakh Programme
mlII
####### s-y"bjs-r!::"P-r9p"31rd"4ryr!!?(EX6s3)
'/ Cardidates are required to give their answers in their own words as far as practicatrle.
####### {,4ttempt 4l!questians.
'/ Th"e figwres in the margin indicate futt$arks.
"/ Assunre suitable data if necessary.
1. Derive a reiation for the fleid intensity for the array of two element isotropic: radiators
####### ri,'ith current equal in magnitude but opposite in phase. Show the condition flor rnaxirna
and rninima direction of intensit--v and dra,w the radiation pattern.
2' What is the importanc of antenna array? Differentiate between End fire and Broadside
an'a,v"
3. Explain the fbllowing antenna parameters.
a) Radiation pattems.
b) ;\ntenna gain and directivity
c) Beain width
4" Sketch the current distributio,n and radiation pafiem of center-t"ed ver-tical
following lengths. [5+3] f2+
i2x3l
dipole for 14l t7l
####### lsl
[3+s]
[3xa]
i) ?"
ii) 3i/
5. Name the parasitic elements used in Yagi-Uda array. Explain their signifieancs in the
anay. Ccmpare Yagi-Uda antenna with Log periodic dipoie airay. U+2.+4]
6. Draw the structure of ionosphere and explain the mechanism of ionosphere propagation, 1"6]
7. Define transmission loss. Derive the Firiss transmission equa-tion of free space
p:opagation. f2i.,
####### 8.,/S/hat is the maximum po\n/er that can be received over a distance of 15 Km line-of-sight
f,ree space with a 3 GEzfrequenc,v consisting of the ransmitting antenna gain of 25 dB
####### and receiving antenna diameter 6 with 759i, antenna elficiency? Where transmitted
pCIwer is 250W.
9. Explain the construction and types of optical fiber with necessary diagrarns.
####### 10. What are the various feature of graded index fiber? Explain the refiactive index profile
and ray transrnission in a multimode graded index fiber. i 1. Vlrite short notes on (any three):
i) Comer reflector antenna
ii) V antenna
iii) Critical frequency
####### iv) I-ight sources in optical communication
Exam. Back Level BE Full Marks 80 BEX Pass Marks 32 Year I Part Tirne 3 hrs"
TRIBHUVAN I]NIYERSITY INSTITI-iTE OF ENGINEERING
Examination Control Division
2076 Bhadra candidates-are required togive their answers in their olvn words as far as practicable.
####### Attempt All questions.
####### The Jigures in the margin indicate Full Marks.
Assume suitable data dnecessary.
1'
X}[:,:ilfe
retarded potential? Explain horv electromagnetic lvaves are generated by a
z' state fbllowing antenna theorem: (a) Maximum power transfer
(b) superposition theorem
3 ' Explain the working principle' construction, advantages
and application of v antenna.
Sketch radiation patterns of both types of V antennas.
4' Describe the antenna gain, antenna efficiency
and antenna polarization with mathematical
####### relation if necessary.
5' what is reflector antenna? with necessary diagrams.
explain parabolic reflector antenna and its different types of feeding systems.
6" with neat diagram design the 5 elernent Yagi-Uda
antenna for the receiving 100 MI{z radio signal showing design steps. consider effective dipole length equal to 0 1 and spacing between elements is 0,c.
7 ' Explain the importance of different layers in Ionospheric
communication.
I' Define and derive the relalion of MUF and skip distance
for the case of flat earth.
9" Derive Friis transmission equation and path ioss in
####### case of free space propagation and
find out distance of line oisight as: d =:.SZ(/4 *
####### 16, )f<o,
10' Explain the construction and piopagation mechanism
####### and application of different types of
optical fibers. Define numerical aperture.
####### i i ' where are optical fibers most widelv used? Explain
the varions advantages and
disadvantages of optical fibers over inetal rvire comrrr,. 12. Write shofi notes on: (Any two) 12+ [3+3] [6+
####### t6l
[1+6]
[/l
t6l 17l [4+3] Is+2] [2+5] [2x3]
a) Knife edge diffraction phenomenon
b) Rhombic Antenna
c) MW Propagation
**rF
Past year questions of Prop. & Antenna for BEI and BEX Institute of Engineering
Course: Computer Engineering (CSE123)
University: Tribhuvan Vishwavidalaya
- Discover more from:
