Hall Ticket No Question Paper Code: AEE002
INSTITUTE OF AERONAUTICAL ENGINEERING
(Autonomous)
B.Tech II Semester End Examinations (Regular) May, 2017
Regulation: IARE R16
ELECTRICAL CIRCUITS
(Common for ECE/EEE)
Time: 3 Hours Max Marks: 70
Answer ONE Question from each Unit
All Questions Carry Equal Marks
All parts of the question must be answered in one place only
UNIT I
1. Using Kirchhoff's current law, find the value of Is in the circuit shown in figure1. Take V1 2V.

Figure 1
Differentiate between
i. dependent and independent sources
ii. ideal and practical sources.
2. A bulb rated 110V, 60W is connected with another bulb rated 110V, 100 W across a 220V mains.
Calculate the resistance which should be joined in parallel with the first bulb so that both the
bulbs may take their rated power.
A current as shown in figure2 is applied across a 5Ω resistor. Find and Plot and
Figure 2
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UNIT II
3. What is meant by dual of a network? Draw the dual circuit for the given circuit shown in figure3

Figure 3
Using nodal analysis find the current through the branch AB for the network shown in figure4.

Figure 4
4. In the network shown in figure5, find the current I1 supplied by the battery using star/delta
transformation.
Figure 5
Using an appropriate circuit, explain graph, tree and basic tie set matrix.
UNIT III
5. Draw the phasor diagram for the series circuit shown in figure6 when the current in the circuit
is 2A. Find the values of V1 and V2 and show these voltages on the phasor diagram.
A inductive coil draw 10A current and consumes 1KW power from a 200V, 50HZ AC supply.
Determine Impedance, power factor, Real power and Reactive power.
6. A resistance of 24
a capacitor of 150F and an inductor of 0.16H are connected in series with
each other. A supply of 240V, 50Hz is applied to the ends. Calculate
i. the current in the circuit
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Figure 6
ii. the potential difference across each element
iii. the frequency to which the supply would need to be changed so that the current would be
at unity power factor
iv. find the current at this frequency.
Explain the relation between apparent power, active power and reactive power. Write their units.
Also explain the significance of power factor.
UNIT IV
7. State and Explain Maximum Transfer Theorem for AC and DC excitations.
A series RLC circuit has R=10
and L=60mH.At a frequency of 25HZ the power factor
of the circuit is 450 lead .At what frequency will the circuit be resonant?
8. Explain
i. Faraday's laws of electromagnetic induction
ii. band width and Q factor of series resonance circuits.
A cast steel electromagnet has an air gap length of 3mm and iron path of length 40cm. Find the
number of ampere-turns necessary to produce a flux density of 0.7wb/m2 in the gap. Neglect
leakage and fringing. Assume ampere turns required for air gap to be 70% of the total ampere
turns.
UNIT V
9. State and explain reciprocity theorem.
State Millman's theorem. Calculate the current I for the circuit shown in Figure7 using Millman's
theorem.
Figure 7
10. State and Explain Tellegen's theorem.
With a suitable circuit explain the solution of a circuit using Thevenin's theorem.