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JNTU B.Tech I ELECTRICAL CIRCUIT ANALYSIS I Previous Question Paper (September - 2023 - R22)

B.Tech | I | I-I | R22 | September - 2023

Answer PaperPaper Code: 181AHMaximum Marks: 60Time: 3 Hours

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

1
Answer all sub-questions.
10 marks
a
Define active elements and passive elements.
1 marks

Answer

Active elements are components capable of generating or delivering energy to a circuit (e.g., voltage and current sources). Passive elements are components that can only dissipate, store, or release energy but cannot generate it (e.g., resistors, inductors, and capacitors).

b
How much energy does a 100-W electric bulb consume in two hours?
1 marks

Answer

Energy is calculated as the product of power and time. Given power = 100 W and time = 2 hours, the energy consumed is 100 W × 2 h = 200 Wh or 0.2 kWh.

c
Given the sinusoid 5 sin (4πt – 60), calculate its angular frequency and time period.
1 marks

Answer

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d
What is the resonance circuit?
1 marks

Answer

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e
State Milliman’s theorem.
1 marks

Answer

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f
What is the condition of maximum power transfer theorem with d.c. excitation.
1 marks

Answer

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g
List out the advantages of poly phase systems.
1 marks

Answer

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h
Define phase sequence.
1 marks

Answer

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i
What is use of dot convention in magnetic circuits?
1 marks

Answer

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j
Define planar graph.
1 marks

Answer

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Part B

210 marks
a
State and explain Kirchhoff’s laws.
4 marks

Answer

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b
Determine the power dissipated by 3Ω resistor in the circuit shown in figure 1.
6 marks

Answer

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OR
310 marks
a
Derive the expression for energy stored in capacitor.
4 marks

Answer

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b
Find the voltages at the three nonreference nodes in the circuit of figure 2.
6 marks

Answer

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410 marks
a
Calculate VO in the circuit in figure 3.
5 marks

Answer

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b
A sinusoidal source supplies 10 kVA reactive power to load Z = 250 Ⅼ− 75° Ω. Determine i) the power factor ii) the apparent power delivered to the load and iii) the peak voltage.
5 marks

Answer

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OR
510 marks
a
An a.c. circuit consists of a pure resistance of 10 Ω and is connected across an a.c. supply of 230 V, 50 Hz. Calculate (i) current (ii) power consumed and (iii) equations for voltage and current.
4 marks

Answer

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b
A coil having a resistance of 7 Ω and an inductance of 31·8 mH is connected to 230 V, 50 Hz supply. Calculate (i) the circuit current (ii) phase angle (iii) power factor (iv) power consumed and (v) voltage drop across resistor and inductor.
6 marks

Answer

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610 marks
a
Use superposition to find VX in the circuit in figure 4.
5 marks

Answer

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b
Find the Norton equivalent circuit for the circuit across ‘a’ and ‘b’ terminals in figure 5.
5 marks

Answer

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OR
7
Using Thevenin’s theorem, find VO in the circuit in figure 6.
10 marks

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810 marks
a
Derive the relation between line and phase voltages and currents for balanced star connected system.
5 marks

Answer

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b
A positive-sequence, balanced delta connected source supplies a balanced delta connected load. If the impedance per phase of the load is (18 + j12) Ω and Ia = 22.5 Ⅼ35° A, find IAB and VAB.
5 marks

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OR
910 marks
a
What are the different methods used for measuring power in three phase circuits?
5 marks

Answer

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b
A balanced three-phase star connected generator with Vph = 220 V supplies an unbalanced star connected load with ZAN = (60 + j80) Ω, ZBN = (100 − j120) Ω, and ZCN = (30 + j40) Ω. Find the total complex power absorbed by the load.
5 marks

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1010 marks
a
Derive the expression for equivalent inductance of two coils connected in series with differential coupling circuits.
4 marks

Answer

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b
Find Vo in the circuit of figure 7.
6 marks

Answer

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OR
1110 marks
a
Describe the procedure for obtaining Incidence matrix with an example.
4 marks

Answer

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b
For the network shown in figure 8. draw the oriented graph, select a suitable tree and obtain the fundamental cut-set matrix.
6 marks

Answer

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