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EC-503 (A) · Communication Network and Transmission Lines (CNTL)/Unsolved PYQ Paper

EC-503 (A) Communication Network and Transmission Lines (CNTL) - Nov 2023 Question Paper

  1. 7 Marks
    aExplain the design of asymmetrical attenuators. Also discuss their working principle.
  2. 7 Marks
    bA symmetric T-section has impedance of $j300\Omega$ in each series arm and impedance of $j80\Omega$ in each shunt arm. Find characteristic impedance.
  3. 7 Marks
    aWhat is the function of m-derived section in a composite filter?
  4. 7 Marks
    bDesign a high pass filter and analyze the performance.
  5. 7 Marks
    aWrite an operating principle of Bott Duffin method. Explain the concept of minimum positive real function.
  6. 7 Marks
    bDiscuss the Foster and Causer Network. Explain the Brune's method and synthesis coefficient.
  7. 7 Marks
    aDerive expression for voltage and current at any point on the transmission line in terms of characteristic impedance and length.
  8. 7 Marks
    bDerive design equations for full series equalizers.
  9. 7 Marks
    aA generator of $1V$, $1 kHz$ supplies power to a $100 km$ long line terminated in $Z_0$ and having the following constants, $R = 10.4 \Omega/km$, $L = 0.00367 H/km$ $G = 0.8 \times 10^{-6} mho/km$, $C = 0.00835 \times 10^{-6} F/km$ Calculate $Z_0$, attenuation constant, phase constant, wavelength and velocity, received current, voltage and power.
  10. 7 Marks
    bExplain double stub impedance matching and its advantage over single stub.
  11. 7 Marks
    aWhat is matching network? Explain bridged T-network.
  12. 7 Marks
    bA cable has an attenuation of $3.5 dB/km$ and a phase constant of $0.28 radians/km$. If $3 volts$ are applied to the sending end, what will be the voltage at point $10 km$ down the line when the line is terminated in its characteristic impedance?
  13. 7 Marks
    aExplain the reflection coefficient of different transmission lines. Explain briefly about open circuit and short circuit line.
  14. 7 Marks
    bDiscuss characteristics preparation co-efficient and Image transfer co-efficient.
  15. 14 Marks
    Write a short note on any two: i) Lattice and Bridged T networks ii) Frequency transformation iii) Conditions for real function iv) Introduction to micro-strip lines
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