BHAJARANG ENGINEERING COLLEGEDept of Electronics and communication Engineering

EC2305 TRANSMISSION LINES AND WAVEGUIDES

Important Two mark Questions

Unit-I

1. Define the following

a)Charactertics impedanceb)Propagation Constant

2. Define Neper. What is its relation with decibals

3. What is constant K-Filter

4. Define insertion loss of a line

UNIT-II

1. Define transmission line

2.What is distortionless line . and give the condition for distortion less line.

3. Define refelection coefficient

4. State Campbell’s equation

UNIT-III

1) Define standing wave ratio

2.Write the parameters of open-wire and Co-axial cables

3.Give the relationship between SWR and reflection coefficient

4.What is the use of circle diagram

UNIT-IV

1) Define Cut-off frequency

2.What is principle wave

3.Define the term phase velocity and group velocity

4. What is TE wave and TM wave

5) What is meant by dominant mode give examples

UNIT-V

1. Define attenuation factor

2. Why TEM mode is not possible for rectangular wave-guides

3. Define Q-FACTOR

4. What is cavity resonator

IMPORTANT SIXTEEN MARKS

UNIT-I

1) Explain the designing of constant- K low pass filter

2. Determine the charatertics impedance and propagation constant for symmetrical T-network

3. Explain the designing of constant- K high pass filter

4. Explain the designing of m-derived low pass filter

UNIT-II

1. Obtain the general solution of a transmission lone and state its physical significance

2. Define distortion and derive the expression for distortionless transmission line

3. Derive the expression for telephone cable loading on a line

4. Calculate insertion loss on a transmission line cable

UNIT-III

1. Explain about quarter wave transformer

2. Discuss the measurement of power and impedance on transmission line using phasor diagram

3. Explain about single stub matching on a transmission line and drive the expression and the length of the stub used for matching on a line

4. Determine the input impedance of open and short circuited dissipoation less transmission line

5. Explain about voltage and current waveform of dissipation less line

UNIT-IV

1. Derive the expression for field strength for TM waves between parellal plates propagating in Z-direction

2. Disscuss the charactertics of TE and TM waves and also derive its cut-off frequency and phase velocity from the propagation constant

3. Derive the expression for field strength for TE waves between parellal plates propagating in Z-direction

4. Derive the Expression for Attenuation factor for TE and TM waves

UNIT-V

1. Determine the solution for electric and magnetic fields of TE waves guided along rectangular waveguide.

2. Explain wave impedance of rectangular waveguide and derive the expression for the wave impedance of TE, TM and TEM waves

3. Derive the field configuration, cutoff frequency and velocity of propagation for TM wave in rectangular waveguide

4. Derive the expression for cut-off frequency, phase shift constant and velocity of propagation of waves in circular waveguides.

5. Determine the solution for electric and magnetic fields of TM waves guided along the circular wave guides

6. Derive the TM wave components in circular waveguides using Bessel’s function

7. What is meant by cavity resonator? Derive the expression for the resonant resonant frequency of the rectangular cavity resonator

1. Define the following

a)Charactertics impedanceb)Propagation Constant

2. Define Naper. What is its relation with decibels?

3. Define transmission line

4. What is distortion less line? And give the condition for distortion less line.

5. Define standing wave ratio

6. Write the parameters of open-wire and Co-axial cables

7. Define Cut-off frequency

8. What is principle wave?

9. Define attenuation factor

10. Why TEM mode is not possible for rectangular wave-guides

Answer all the questions

11. Explain the designing of constant- K low pass filter (OR)

12. Determine the charatertics impedance and propagation constant for symmetrical T-network

13. Obtain the general solution of a transmission lone and state its physical significance (OR)

14. Define distortion and derive the expression for distortion less transmission line

15. a) Explain about quarter wave transformer

b) Discuss the measurement of power and impedance on transmission line using phasor diagram(OR)

16. Explain about single stub matching on a transmission line and drive the expression and the length of the stub used for matching on a line

17. Derive the expression for field strength for TM waves between parallel plates propagating in Z-direction (OR)

18. Discuss the charactertics of TE and TM waves and also derive its cut-off frequency and phase velocity from the propagation constant

19. Determine the solution for electric and magnetic fields of TM waves guided along the circular wave guides (OR)

20. Derive the TM wave components in circular waveguides using Bessel’s function

With example problem in text book(john d Ryder ) and smith chart problem