JAWAHARLAL NEHRU TECHNOLOGICAL UNIVERSITY HYDERABAD
JAWAHARLAL NEHRU TECHNOLOGICAL UNIVERSITY HYDERABAD B.Tech II Year NETWORK ANALYSIS AND TRANSMISSION LINES Previous Question Paper (March - 2022 - R18)
Answer any five questions. All questions carry equal marks.
Main
Explain the following terms:
Graph of a network
Answer
A Graph of a network is a simplified topological representation of an electrical circuit where all circuit elements (resistors, inductors, capacitors, sources) are replaced by simple line segments called branches, and the points where these branches meet are represented as nodes or vertices. The graph focuses solely on the interconnection pattern of the network elements, ignoring the specific nature or values of the components themselves.
Oriented Graph
Answer
An Oriented Graph (or Directed Graph) is a graph in which each branch is assigned a specific direction, usually indicated by an arrowhead. This orientation signifies the assumed reference direction for current flow or voltage polarity within that branch. If a graph has no assigned directions, it is referred to as an unoriented or non-directed graph.
Rank of a Graph
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Planar and non-planar graph
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Subgraph
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Calculate the currents I1 and I2 for the following circuit shown in figure 1.
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Prove that the active power consumed in any purely reactive circuit is zero.
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For the following network shown in figure 2, a steady state is reached with switch open. At t = 0, switch is closed. Find the three loop currents at t = 0+.
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For the circuit shown in figure 3, find i1(t) for ω = 100 rad / sec.
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Explain the condition for symmetry in a two port network with a proper example.
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For the following network shown in figure 4, find the Y – parameters.
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What are image parameters? Derive expression of image parameters in terms of:
ABCD parameters
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open-circuit and short-circuit impedances.
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The values of primary constants of an open-wire line per km are R = 10 Ω, L = 3.5 mH, C = 0.008 μF and G = 0.7 μƱ. For a signal frequency of 1000 Hz, calculate the characteristic impedance, Propagation constant, attenuation constant, phase constant, wavelength and phase velocity vp.
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List and explain the characteristics of impedance smith chart.
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Explain the significance and design of single stub impedance matching and discuss the factors on which stub length depends.
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