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Professor Miller, Manchester Metropolitan University, Electrical Engineering, Communication Engineering B, 2000 2001 Exam.
Typology: Exams
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Exam ination for th e H ND ELECTR O NIC ENGINEER ING
Monday 14 May 2001
2.00 pm to 4.00 pm
Instructions to Candidates
A ttem pt ALL questions.
Form ulae b ook s are provided.
05/09 /02 continued
(b ) Tw o signals are analysed by Fourier series analysis and th e follow ing results are obtained for th e respective signals.
Signal (^1)
ω + ω + ω π
= sin 5 t 5
sin 3 t 3
sin t
f (t) 0 0 0
Signal (^2)
ω + ω + ω π
= + sin 3 t 3
sin 2 t 2
sin t
f (t) (^1000)
Using th e ab ove series sk etch a graph of signalagainst frequency for each of th e signals analysed. [8]
(c) Sk etch th e line code for th e 8 b it sequence 00111010 using Manch ester Encoding. [8]
(ii) Calculate th e cab le ch aracteristic im pedance if it is to be used as a lossless transm ission line. [4]
(ii) A load of 100 Ω is connected to th e cab le, calculate th e voltage reflection coefficient. [4]
(b ) Sh ow m ath em atically h ow a double-sideband suppressed carrier signalcan b e generated by am plitude m odulation. [6]
(c) W ith th e aid of diagram s explain h ow ph ase sh ift k eying is used in digital m odulation. [6]
