August
V63/T04063/EE/20150816
2015
Advance Communication System
Instructions:
Marks-80
Time: 3 Hrs
1. All questions are compulsory.
2. “Long Answer type Question (LAQ)” is a supply type
question of 15 marks which required a typical answer of about
60-80 lines in bout 32-40 minutes.
3. “Sort Answer type Question (SAQ)” is a supply type question
of 5 marks which required a typical answer of about 15-20 lines
in bout 08-10 minutes.
4. Figures to the right indicate marks allotted to the questions.
5. Assume suitable data if necessary
6. Use a nonprogrammable type of scientific calculator is
allowed
Marks
SECTION-A
Q.1 State working, principle and applications of magnetron
15
OR
Q.1 Draw the construction of H-plane and explain the working
principle.
15
Q.2 Describe the term with respect to satellite communication
i) Look angle ii) Angle of elevation iii) Azimuth angle.
15
OR
Q.2 Explain Rader Bacons and State its equation, significance
15
Q.3 Explain antenna tracking.
5
Q.4 Explain the concept of dominant mode.
5
SECTION-B
Q.5 Explain the block diagram of fiber optic communication system.
15
OR
Q.5 A step index fiber has a numerical aperture of 0.16, a core
refractive index of 1.45 and core diameter 90 mm. calculate
i)
The acceptance angle ,ᶱA.
ii)
ii) The refractive index of the cladding. Solution: Given
NA=0.16 n1= 1.45 To find:
i) ᶱA=? ii) n2=?
15
Q.6 Compare multimode and single mode step index fiber
15
OR
Q.6 Explain with neat sketch multimode step index fiber.
15
Explain with neat sketch multimode step index fiber.
5
Q.7
Q.8 Explain the concepts of LASER(light amplification by stimulated
emission of radiation).
Computer Generated Random Question Paper dated: 11-07-2015 16:42:14
5