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Advanced Communication System Question Paper - Dec 18 - Diploma In Electronics Engineering (Semester 6) - Maharashtra State Board of Technical Education (MSBTE)
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Advanced Communication Systems - W18
Diploma in Electronics Engineering (Semester 6)
Total marks: 100
Total time: 3 Hours
INSTRUCTIONS
(1) All Questions are compulsory.
(2) Answer each next main Question on a new page.
(3) Illustrate your answers with neat sketches wherever necessary.
(4) Figures to the right indicate full marks.
(5) Assume suitable data, if necessary.
(6) Use of Non-programmable Electronic Pocket Calculator is permissible.
(7) Mobile Phone, Pager and any other Electronic Communication
devices are not permissible in Examination Hall.
Attempt any THREE :
1.a.i
Define the term cut-off frequency and cut-off wavelength. State their
mathematical formulae.
(4 marks)
8312
1.a.ii
State significance of two cavities in multicovity Klystron. State its effect
on Bandwidth.
(4 marks)
00
1.a.iii
State advantages and disadvantages of continuous wave Radar. (Two
each)
(4 marks)
8333
1.a.iv
Define the term Geostationary satellite. State its advantages.
(4 marks)
8339
Attempt any ONE :
1.b.i
Compare waveguide and transmission line on the basis of definition,
operating mode, construction, frequency range, applications and
limitations.
(6 marks)
00
1.b.ii
State the name of microwave diode suitable for following each
application :
(i) Microwave oscillator
(ii) Replacing TWT Transmitter
(iii) Microwave Power Switching
(iv) Airborne Radar
(v) Logic operations
(vi) Pulse modulation
(6 marks)
00
Attempt any FOUR :
2.a
For a rectangular waveguide with a wall separation of 4 cm and a desired
frequency of operation is 8 GHz, determine :
(i) Cut-off frequency
(ii) The Phase Velocity
(4 marks)
00
2.b
With neat cross sectional constructional details, write effect of magnetic and
electric field in magnetron.
(4 marks)
00
2.c
State RADAR range equation and write factor influencing maximum range.
(4 marks)
8511
2.d
Sketch block diagram of satellite earth station and state functions of each
block.
(4 marks)
00
2.e
State any four advantages and four disadvantages of fibre optic
communication.
(4 marks)
8436
2.f
Define the term multimode fiber, step Index fiber, Graded Index fiber and
single mode fiber.
(4 marks)
00
Attempt any FOUR :
3.a
Sketch field pattern for $TE_{11}$ mode of Rectangular waveguide. State its any
two advantages.
(4 marks)
00
3.b
Sketch constructional diagram of Tunnel diode and state any four feature.
(4 marks)
8313
3.c
Explain Pulse Radar with neat block diagram.
(4 marks)
8510
3.d
State frequency range for up link and down link for C band and Kv band for
satellite.
(4 marks)
8338
3.e
Define the term Numerical aperture, Acceptance Angle & Critical Angle for
optical fiber cable.
(4 marks)
8341
Attempt any THREE :
4.a.i
Compare :
(i) TE Mode & TM Mode
(ii) Circular wave guide & Rectangular wave guide
(4 marks)
00
4.a.ii
Sketch schematic diagram of IMPATT diode and write its working
principle.
(4 marks)
8329
4.a.iii
State the meaning and sketch antenna scanning pattern for Horizontal
scan, Helical scan, Spiral scan and Nodding Scan.
(4 marks)
00
4.a.iv
Why altitude control is essential for satellite ? Hence write the role of
altitude control subsystem for satellite.
(4 marks)
8518
Attempt any ONE :
4.b.i
State the concept of continuous wave RADAR. Sketch its block
diagram. State its any two applications.
(6 marks)
00
4.b.ii
A optical fiber with a core diameter large enough, has a core refractive
index of 1.70 and a cladding refractive index of 1.65. Calculate critical
angle, numerical aperture and acceptance angle.
(6 marks)
00
Attempt any FOUR :
5.a
Explain Hybrid Tee with neat sketch.
(4 marks)
8491
5.b
Velocity modulation occurs in two cavity Klystron amplifier. Justify with neat
sketch.
(4 marks)
8326
5.c
Compare LED with LASER on the basis of principle of operation, spectral
width, data rate, compatible fibers.
(4 marks)
00
5.d
Draw the block diagram of satellite sub-system & explain power subsystem.
(4 marks)
00
5.e
A step index fiber has a numerical aperture of 0.14 a core refractive index of
1.50 and core diameter 80 mm. Calculate acceptance angle and refractive
index of cladding.
(4 marks)
00
5.f
Explain OTDR with neat diagram & give its advantages.
(4 marks)
00
Attempt any FOUR :
6.a
Explain Reflex Klystron with neat sketch & define Transit Time. Give two
application of it.
(4 marks)
00
6.b
Define the term absorption loss. State types of absorption losses. How these
losses occurs ?
(4 marks)
00
6.c
List out any four essential properties of fiber connector.
(4 marks)
00
6.d
State the functions of telemetry and trucking sub-system of satellite.
(4 marks)
00
6.e
Compare PIN photo diode with avalanche photo diode. (any four factors)
(4 marks)
00
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