SRM University 2007 B.Tech Electronics and Communications Engineering BANK FOR Transmission Lines and Wave Guides - Question Paper

S.R.M. Institute of Science & Technology
School of Electronics & Communication Engineering
ques. BANK
Subject Code : EC206
Subject Name : Transmission Lines and Wave Guides
Year & Sem : II Year , fourth Sem (ECE)
UNIT I – TRANSMISSION LINE THEORY
PART-A

1. What are the various kinds of transmission lines?
2. Draw the equivalent circuit of transmission line.
3. What are the primary and secondary constants of transmission lines?
4. Write Characteristic Impedance and Propagation Constant interms of Primary Constants of line.

5. Define Infinite Line.
6. Write the General Line formula of a transmission line.
7. Write Input Impedance of open and short circuit line.
8. Why Reflection occurs in Transmission lines?
9. Define Reflection loss.
10. Define Reflection Coefficient.
11. Define Reflection Factor.
12. Define Waveform Distortion and mention its kinds.
13. Define Frequency Distortion.
14. Define Phase or Delay Distortion.
15. What is the condition for Distortion less line?
16. What is smooth line?
17. Define Loading and the cause for Inductive Loading.
18. What is meant by Continuous Loading?
19. What is meant by Lumped Loading?
20. What is Transfer Impedance and write its formula.
21. Write the relation ranging from Zo, Zoc & Zsc.
22. An Open wire Telephone Line has R=10 ohms/Km, L=0.0037H/Km, C=0.0083 micro Farad/Km and G=0.4 micro mhos/Km. Determine Zo at 1000Hz.

23. If Zoc=710/_50 ohms , Zsc=300/_80 ohms. obtain Zo.
24. A 100 Km long Transmission Line is terminated by a resistance of 200 ohms. Zo=600 ohms. obtain the reflection Coefficient.
PART-B
1. Derive the General Line formula of a Transmission Line.
2. Explain and derive the condition for various kinds of Loading
3. Find the sending end impedance of line having negligible losses, where Zo is 55 ohms and receiving end impedance 155+j75 ohms and line is 1.183 times the Wavelength.

4. a) discuss the cause for reflection and derive an formula for Reflection Coefficient. b) discuss Reflection and derive the formula for reflection factor and reflection loss.

5. Explain about various kinds of distortion and derive the condition for distortion less line.

6. The primary Constants of a cable are R=80 ohms/Km, L= 2mH, G= 0.3 micro mhos/Km and C= 0.07 micro Farad/Km. compute the Secondary Constants and the velocity of propagation at 100Hz.

7. a)Derive the formula of Input Impedance and Transfer Impedance of a Line
b) In a Line per kilometer R=42.9 ohms, L=0.07 mH, C=0.01 micro Farad and G=2.5 micro mhos. obtain the Characteristic Impedance when w=5000 rad/sec.

8. A long transmission line of characteristic Impedance 500/_-43 ohms and Propagation Constant of 0.07+j0.08 per Km is properly terminated. A voltage of 5V is applied at the sending end. compute the voltage and current at a distance of 10 km from the receiving end.

Earning:   Approval pending.