JNTU
JNTU B.Tech II ELECTRICAL CIRCUITS Previous Question Paper (April/May - 2023 - R15)
Note: i) Question paper consists of Part A, Part B. ii) Part A is compulsory, which carries 25 marks. In Part A, Answer all questions. iii) In Part B, Answer any one question from each unit. Each question carries 10 marks and may have a, b as sub questions.
Part A
Differentiate between circuit and network.
Answer
A circuit is a closed conducting path through which an electric current flows, containing at least one energy source. A network is a more general term referring to any interconnection of electrical elements, which may or may not form a closed path and may or may not contain an energy source.
Draw current relationship for inductor fed by RAMP voltage.
Answer
For an inductor fed by a ramp voltage v(t) = kt, the current is given by the integral of voltage: i(t) = (1/L) ∫ kt dt = (k/2L)t2. The current relationship is parabolic, starting from zero and increasing quadratically with time.
Define Form and peak factor of an A.C. quantity.
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Define admittance and conductance.
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Draw locus diagram for RL parallel circuit.
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What is coefficient of coupling? Give formula.
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Define network topology.
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Give dual of series network, contains R & L and C components across a voltage source.
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Draw Thevinin’s and Norton’s equivalent circuit.
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Derive condition for maximum power transfer.
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Part B
Find the equivalent resistance between X and Y (figure 1).
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Find the equivalent star network (figure 2) across X, Y and Z terminals.
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Find the I0 using Nodal analysis (figure 3).
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Find V0 in the circuit using mesh analysis (figure 4).
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An alternating voltage is given by V=230sin314t. Calculate i) frequency ii) maximum value, iii) average value, iv) RMS value.
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In a series circuit containing pure resistance and a pure inductance, the current and the voltage are expressed as: I(t) = 5sin(314t+2π/3) and v(t) = 15sin(314t+5π/6). Calculate: i) Impedance, ii) Resistance, iii) Inductance, iv) Average power, v) Power factor.
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For the circuit shown in figure 5
Calculate I, VR, VL, and VC in phasor form.
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Calculate the total power factor.
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Calculate the average power delivered to the circuit.
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Draw the locus diagram with Series RL circuit with varying R.
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Draw the locus diagram with Series RC circuit with varying supply frequency at constant supply voltage.
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State and explain Faraday’s laws of electromagnetic induction.
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Write short note on dot convention used in magnetically coupled coils.
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What is an incidence matrix? What are its properties?
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What is a cut set, fundamental cut set and cut set matrix?
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What is a Tie set, fundamental Tie set and Tie set matrix?
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Explain different steps involved in drawing a dual of a given network.
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State Milliman’s theorem.
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Find the voltage across 4 Ohms resistance using Milliman’s theorem. Also, find the current through 4 Ohms resistance (figure 6).
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In the network shown in figure 7. Find the value of RL such that maximum possible power will be transferred to RL. Find also the value of the maximum power and the power supplied by source under these conditions.
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State and explain compensation theorem.
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