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Seat No.: Enrolment
GUJARAT TECHNOLOGICAL UNIVERSITY
DIPLOMA ENGINEERING SEMESTER -III• EXAMINATION SUMMER 2017
Subject Code: 331103 Date: 10 05 2017
Subject Name: Electronics Networks Lines
Time: 02:30 PM TO 05:00 PM Total Marks: 70
Instructions:
1. Attempt all questions.
2. Make Suitable assumptions wherever necessary.
3. Figures to the right indicate full marks.
4. Use of programmable Communication aids are strictly prohibited.
5. Use of only simple calculator is permitted in Mathematics.
6. English version is authentic.
Q.1

Prove maximum power transfer theorem.
07





Derive equations to convert π-type network into T-type network.
07

T

Q.2

What is resonance? Get the equations for current at resonance the resonance frequency for a series resonance circuit. Draw the frequency response curve for this circuit.
07





Derive the equation of resonance frequency in series resonant circuit.
07



OR

Derive equation of anti-resonant frequency of parallel resonant circuit.
07



Q.3

Write Short Note On Phase Equaliser.
07





Design a symmetrical T network attenuator If Ro 600 ohms attenuation is 20 dB.
07

R0 =600 ohms 20 dB T

OR
Q.3

Classify attenuators. Establish relationship between Neper Decibel. Justify that attenuation is independent of frequency.
07





Design a symmetrical network attenuator if R0 =600 ohms and D =40 dB.
07
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R0 =600 ohms D =40 dB

Q.4

Give comparison of active filters and passive filters.
07





Explain Low pass filter. Get the equation of 'Cutoff Frequency' for constant K type section. Draw explain the frequency response curve for this circuit.
07

K T

OR
Q.4

Give classification of filters showing frequency response curves for each of them.
07





What are the advantages of m derived filters? Draw m derived T and sections for high pass filters.
07

m m T

Q.5

Explain the loading of telephone cable.
07





For Transmission line define V.S.W.R. and Reflection coefficient. Establish relationship between V.S.W.R. and Reflection coefficient.
07

V.S.W.R. V.S.W.R.

OR
Q.5

Derive general equation for voltage and current of a transmission line.
07





Derive and explain distortion less condition for transmission line.
07