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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 2022 Question Paper

  1. 7 Marks
    aDefine parameters of a 2-port symmetrical network and derive mathematical expression for the same. OR A symmetrical 2-port T-network has elements $(10+j2)$ ohms in the series arms, and $(10+j5)$ ohms in the shunt arm. Find its characteristic impedance.
  2. 7 Marks
    bDefine parameters of a 2-port asymmetrical network and derive mathematical expression for the image impedances. OR An asymmetrical 2-port T-network consists of $Z_1 = 2+j3$ ohms, $Z_2 = 2+j10$ ohms and $Z_3 = 30$ ohms, Where impedance $Z_3$ constitutes the shunt arm of the network. Calculate the image impedances for this network.
  3. 7 Marks
    aWhat are m-derived filters? Explain. Describe their applications in brief. OR A band pass filter has lower cut-off frequency $f_1$ and upper cut-off frequency $f_2$. Find its resonance frequency.
  4. 7 Marks
    bWhat are the limitations of constant-K filters? Explain How these can be resolved? OR Design an m-derived filter (T-section) with the following specifications: Cut-off frequency $f_c = 1000$ Hz, frequency of infinite attenuation $f_{in} = 1250$ Hz, Nominal resistance $R_o = 50$ ohms.
  5. 7 Marks
    aWhat are the necessary condition for a function to be realized? Explain. OR Consider a network function $F(s) = \{(s+6)\}/\{(s+4)(s+8)\} = [\{K_1/(s+4)\}+\{K_2/(s+8)\}]$. Find the values of constants $K_1$ and $K_2$ and realize this network function.
  6. 7 Marks
    bRealize the network function $F(s) = [\{(s+2)(s+6)\}/\{(s+3)(s+9)\}]$. OR Describe the Cauer-I and Cauer-II forms of the networks with the suitable examples.
  7. 7 Marks
    aDescribe characteristics of an infinite line and matched line. And discuss the phenomenon of power reflection on line in brief. OR The measurements taken on a line are as follows: Open circuit impedance $Z_{oc} = 1600$ ohms Short circuit impedance $Z_{sc} = 400$ ohms. Find its primary and secondary coefficients.
  8. 7 Marks
    bWhat are the important properties and applications of a short circuited lines and open circuited lines? Explain in detail. OR Describe major applications of the Smith's chart.
  9. 7 Marks
    aDescribe characteristics of a quarter wave line. Find input impedance of a quarter wave line with characteristic impedance $Z_O = 100$ ohms and load resistance of $R_L = 4$ ohms. OR Derive transmission line equations.
  10. 7 Marks
    bDefine the terms namely reflection factor (constant) and VSWR. A line (with characteristic Impedance $Z_O = 50$ ohms) is terminated in $Z_L = 100$ ohms. Find reflection factor (constant) and VSWR for this 2-wire line. OR Give description of line parameters in brief.
  11. 7 Marks
    aWhat are the various kinds of distortions occurring on a line? Derive conditions for a line to be distortion less. OR A transmission line is characterised by $R = 8.2$ ohms per km and $G = 15$ micro-Mhos per km. Calculate it's primary and secondary constant.
  12. 7 Marks
    bDescribe the characteristics of composite filters (L-C) in brief. OR Derive design equations for a low pass m-derived filter.
  13. 7 Marks
    aDiscuss parameters for high frequency lines in brief. OR Discuss the single stub matching technique in brief.
  14. 7 Marks
    bAn asymmetrical 2-port T-network consists of $Z_1 = 10+j40$ ohms, $Z_2 = 5+j2$ ohms and $Z_3 = 20$ ohms, Where $Z_3$ is the shunt arm element. Find image impedances for this network. OR Realize the network function $F(s) = \{(s^2+1)(s^2+9)\}/\{(s^2+4)(s^2+16)\}$.
  15. 7 Marks
    aWhat is Attenuator? Explain. And derive design equations for a 2-port T-attenuator. OR Discuss various kinds of filter design (approximation) techniques in brief.
  16. 7 Marks
    bGive reactance curves for LPF and HPF filters (L-C). Indicate all bands and cut-off points clearly. OR Discuss double stub matching technique in brief.
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