JNTU
JNTU B.Tech I Year ELECTRICAL CIRCUIT ANALYSIS I Previous Question Paper (January/February - 2024 - R22)
Note: This question paper contains two parts A and B. Part-A for 10 marks, Part-B for 50 marks. Part-A is a compulsory question. Part-B consists of ten questions (numbered from 2 to 11) carrying 10 marks each. From each unit, there are two questions and the student should answer one of them.
Part A
Part-A is a compulsory question which consists of ten sub-questions from all units carrying equal marks.
State Kirchoff’s Voltage law.
Answer
Kirchhoff’s Voltage Law (KVL) states that the algebraic sum of all voltages around any closed loop in a circuit is zero at any instant of time.
What are the dependent sources?
Answer
Dependent sources are active circuit elements whose voltage or current output is controlled by another voltage or current existing elsewhere in the circuit.
Define peak factor.
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What is the significance of operator ‘j’?
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State reciprocity theorem.
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State Norton’s theorem.
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Write the relation between line and phase voltages in star connected system.
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What is meant by unbalanced load?
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Define Tree.
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Define self-inductance.
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Part B
By considering a suitable example, explain the star-to-delta transformation for a resistive network.
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Find all the branch currents for the network shown below figure 1.
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Describe different types of active elements and passive elements in the circuit analysis.
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Find the power absorbed by each element in the circuit shown in figure 2.
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Derive an expression for quality factor RLC series resonant circuit.
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A series RC circuit having variable R and C=20 µf is supplied from AC source having voltage V=200 Volt at ω=2000 rad/sec. Draw current locus for sample values of R=0, 5, 15, 25, 35, 50Ω.
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Define RMS value, Average value and form factor of an alternating quantity. Determine these values for the periodic function shown in figure 3.
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Use the superposition theorem to find v in the circuit of below Figure 4.
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Discuss about the duality exists between Thevenins theorem and Norton’s theorem.
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Using Norton’s theorem, find the equivalent circuit to the left of the terminals in the circuit of below figure 5. Then find I.
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Find the change in current in the branch (6-j8) when 4 ohms resistor is changed to 5 ohms. Use compensation theorem. What is the new current in that branch the figure 6?
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Derive the relation between line and phase quantities in star connected system with necessary diagrams.
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A 400 V, 3-phase, balanced supply is connected to an unbalanced delta load having three impedances ZAB = 106∠-90o Ω, ZBC = 63.25∠71.56o Ω, ZCA = 100 Ω. Calculate line currents and power consumed if (i) the phase sequence is ABC and (ii) the phase sequence ACB.
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A balanced mesh connected load of (12 + j9) ohm per phase is connected to a three phase, 400 V supply. Find (a) line current, (b) power factor, (c) power, (d) reactive volt-amperes and (e) total volt amperes.
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Explain the dot convention in coupled circuits.
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Explain the steps involved in finding the fundamental cut sets and also list its properties.
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Draw the oriented graph of the network shown in figure 7 below and write the cut set matrix.
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