JNTU
JNTU B.Tech II NETWORK THEORY Previous Question Paper (May/June - 2019 - R16)
Part A is compulsory which carries 25 marks. Answer all questions in Part A. Part B consists of 5 Units. Answer any one full question from each unit.
Part A
What is Mutual Inductance?
Answer
Mutual inductance is the property of two or more coils by which a change in current in one coil induces an electromotive force (EMF) in the other coil due to the linkage of magnetic flux. It is denoted by M and measured in Henrys (H).
Write the cutset matrix for the graph shown in figure 1 taking branches 3, 4, 6 as tree.
Answer
The cutset matrix is constructed by identifying fundamental cutsets formed by adding one link at a time to the tree (branches 3, 4, 6). Each row represents a fundamental cutset, and each column represents a branch. The entry is +1 if the branch direction aligns with the link direction, -1 if it opposes, and 0 if the branch is not in the cutset.
What is meant by balanced three phase supply.
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Draw the power triangle and give the relations between active power, reactive power and apparent power.
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Define time constant of a circuit. What is the time constant of an RL circuit.
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Define impulse and step input.
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Obtain the transfer function of the system shown in figure 2.
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What is the significance of poles and zeros of a system?
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Show graphically the difference between the low pass filter and a high pass filter.
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Differentiate low pass, High pass and Band pass filters.
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Part B
State Faradays’ Laws of Electromagnetic induction.
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Using nodal analysis find the currents and voltages ix, iy, iz, im, in, Va, Vb, Vc, Vd marked in the circuit shown in figure 3.
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For the series magnetic circuit shown in figure 4, Find the value of I required to develop a magnetic flux of 4×10^-4 Wb. Given that Magnetizing force H for cast steel is 170 At/m. Determine μ and μr for the material under these conditions.
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Derive the relation between self-inductance and mutual inductance. What does coefficient of coupling indicate?
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Derive the relation between star connected system and delta connected system of impedances. Clearly indicate the nomenclature followed.
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Illustrate any one method for measurement of active power.
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Obtain the expression for active power in a balanced three phase system.
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A balance load of (10+j5)Ω per phase, connected in star is fed from a three phase, 400V supply. Find the line current, power factor, total power, reactive VA and total VA.
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For the circuit shown in figure 5, the switch S has been closed for a long time and then opens at t=0. Find values for various parameters at t=0-, t=0+, and t=infinity.
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Find i1(t) and i2(t) for t > 0 in the following circuit using Laplace transforms shown in figure 6.
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List the properties of driving point positive real functions.
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Obtain the transmission parameters of the network shown in figure 7.
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Explain the series connection of two, two-port networks with a figure 8. Prove that the open circuit impedance parameters of the overall network is equal to sum of corresponding Z-parameters of individual networks.
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Find the driving point impedance of the network shown in terms of ‘s’.
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What is a low pass filter? Explain different types of low pass filters with neat diagrams.
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Draw a RL low pass filter and RL high pass filter and write the expression for output voltages.
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Explain in detail the constant K type low pass and high pass filters.
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What are the disadvantages of K type filters?
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