Jawaharlal Nehru Technological University Hyderabad
Jawaharlal Nehru Technological University Hyderabad B.Tech II ELECTRICAL CIRCUITS Previous Question Paper (February - 2024 - R13)
Part A is compulsory. Part B: Answer any one question from each unit.
Part A
Write the V-I relation of i) Inductance and ii) Capacitance.
Answer
i) For an inductance L, the voltage-current relationship is given by the formula:
ii) For a capacitance C, the voltage-current relationship is given by the formula:
Explain Kirchhoff’s voltage law with example.
Answer
Kirchhoff’s Voltage Law (KVL) states that the algebraic sum of all voltages around any closed loop in a circuit is zero. This is based on the principle of conservation of energy, as the total energy supplied by sources must equal the total energy dissipated or stored by circuit elements.
For example, in a simple series circuit with a voltage source V and two resistors R1 and R2, the loop equation is:
This implies that the source voltage is equal to the sum of the voltage drops across the resistors, V = I(R1 + R2).
What is the significance of j operator?
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Define Reactance and Susceptance.
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Define band width.
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Draw the locus diagram for RC series circuit with ‘R’ fixed and ‘C’ variable.
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Define tree and co-tree.
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Define i) links ii) twigs of a graph.
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State Tellegens theorem.
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State Thevinin’s theorem.
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Part B
Find the equivalent resistance of the circuit shown and find the current produced by 10V source.
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A 3 phase, Star system containing impedances of (7 + j4) Ω, (3 + j2) Ω, and (9 + j2) Ω on three phases, when a supply of 440 V is applied to the system. Convert the impedances into delta system.
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Explain nodal analysis with a suitable example.
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Differentiate between independent and dependent sources. What is their circuit representation?
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Derive the expression for RMS value of a sinusoidal waveform.
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A voltage of 200 V is applied to a pure resistor (R), a pure capacitor, C and a lossy inductor coil (L), all of them connected in parallel. The total current is 2.4 A, while the component currents are 1.5, 2.0 and 1.2 A respectively. Find the total power factor and power.
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Explain the concept of power triangle of single phase A.C system.
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Find the current expression for a circuit having series impedance of (3-j4) Ω connected across 230 V, 50HZ, A.C supply.
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Briefly explain the procedure of drawing the locus diagram of a RC series circuit with fixed Capacitance and Variable Resistance.
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Derive the expression for the bandwidth of a series RLC circuit.
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Two coils having 800 and 1000 turns are wound on a common non-magnetic core. The leakage flux and mutual flux due to a current of 5A in coil is 0.3 mwb and 0.6 mwb respectively. Find i) Self and mutual inductance ii) coefficient of coupling.
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Explain “dot convention” for a set of magnetically coupled coils.
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Write the tie set schedule for the circuit shown below develop the equilibrium equations.
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Briefly explain the concept of duality with an example.
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Find the bus incidence matrix and cut set matrix.
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For the graph shown in figure 4 write the Tie set matrix.
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Calculate the current through the 3Ω resistor in the circuit shown in figure 5 shown using super position theorem. Also calculate the power across the 3Ω resistor.
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State and explain Millman’s theorem for d.c excitations.
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State and explain Norton’s Theorem.
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Determine the value of R so that maximum power is transferred.
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