Department of Electronics and Communication Engineering Acharya Institute of Technology III INTERNAL ASSESMENT Odd Sem 2014-15 Date: 11/11/2014 Sub with Code: Basic Electronics (14ELN15) Semester: 1 st P sec Max Marks: 50 Time: 90 min Note:.Answer ANY 5 questions [SELECTING 1 FROM EACH PAIR] Question CO address ed Mark s 1. Define Ampitude Modulation. Draw Waveform of AM wave. And Derive Expression for AM wave 3 10 OR 2 What are the needs for Modulation. And Show that Pt= Pc(1 + m 2 /2) 3 10 3. Compare AM and FM. & Define Modulation index for AM and FM. 10 OR 4. A Carrier Wave of 500W, 1M Hz is amplitude modulated with sinusoidal signall of 1K Hz, dept of Modulation is 60%. Calculate Upper and lower cutoff Frequencies, Bandwidth, Total power and power in each sidebands. 10 5 What is ISDN? Explain the services of ISDN. 10 OR 6. With a neat block diagram explain the Optical Fiber Communication. 10
Department of Electronics and Communication Engineering Acharya
Institute of Technology
III INTERNAL ASSESMENT OddSem !"#$"%Date& ""'""'!"#Sub with
Code:Basic Electronics (14ELN15)Semester: 1st PsecMax Marks:
50Time: 90 min
Note:.Answer ANY 5 questions [SELECTING 1 F!" E#C$
P#I%QuestionCOaddressedMarks1.&e'ne #m(it)*e "o*)lation+
&ra, -a.e/orm o/ #" ,a.e+#n* &eri.e E0(ression /or #" ,a.e1
10OR2 What are the needs for Modulation. And Show that Pt= Pc(1 +
m2/2)1 101+Comare AM and !M."#efine Modulation inde$ for AM and
!M.10OR4+ A Carrier Wa%e of &''W( 1M )* is amlitude modulated
with sinusoidal si+nall of 1, )*( det of Modulation is -'..
Calculate /er and lower cutoff !re0uencies(1andwidth( 2otal ower
and ower in each side3ands.10 5 What is 4S#56 7$lain the ser%ices
of 4S#5. 10OR3+ With a neat 3loc8 dia+ram e$lain the 9tical !i3er
Communication. 104 With a neat 3loc8 dia+ram e$lain the mo3ile hone
s:stem 10!5 7$lain th 3loc8 dia+ram of communication s:stem 109
7$lain the 3asic toolo+: of t:ical telehone networ8 10OR10 ;ist the
Ad%anta+es and Alications of 9!C 10
