EC8251 Circuit Analysis
EC8251 Circuit Analysis
EC8251 Circuit Analysis
com
DEPARTMENT OF
ELECTRONICS AND COMMUNICATION ENGINEERING
QUESTION BANK
II SEMESTER
EC8251-CIRCUIT ANALYSIS
Regulation – 2017
Prepared by
QUESTION BANK
5. List the dual pairs and say what Duality is? BTL 1 Remembering
10. Illustrate link current and tie set matrix BTL 2 Understanding
Calculate the number of branches and nodes in the given BTL 3 Applying
figure.
13.
15.
Analyze the given figure and find the voltage at load. BTL 4 Analyzing
16.
20.
PART – B
Q. No. Questions BT Level Competence
Schematize the dual network of the given circuit and BTL 6 Creating
explain its procedure. (16)
1.
Describe the concept of duality and dual pairs. Also state BTL 1 Remembering
2. the procedure followed to interchange between dual pairs.
(16)
State incidence matrix and its properties. Also describe BTL 1 Remembering
3.
the relationship between KCL and incidence matrix. (16)
Analyze the given electrical network and draw its BTL 4 Analyzing
topological graph, write its incidence matrix, tie-set
4.
matrix, link current transformation equation and branch
currents. (16)
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5.
Predict the voltage VAB in the circuit shown below. (16) BTL 2 Understanding
6.
Using Ohm’s law and Kirchoff’s law on the circuit given BTL 2 Understanding
below, identify Vin, Vs and the Power provided by the
7.
dependent sources. (16)
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Assess the current delivered by the source in the circuit BTL 5 Evaluating
shown below. (16)
8.
i) Explain the procedure involved in Mesh current BTL 3 Applying
method. (8)
9.
ii) Calculate the Current supplied by 60V source in
the given network using mesh current method. (8)
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10.
Solve the network of given figure by using loop analysis. BTL 3 Applying
Use the incidence matrix of the loop (tie-set matrix). (16)
11.
Using Nodal analysis analyze the given circuit and BTL 4 Analyzing
estimate current in all branches. (16)
13.
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14.
5. Apply Millman’s theorem and find the current through 1 Ω resistor. BTL 3 Applying
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6. Estimate the current through 5Ω resistor by using Superposition Theorem BTL 6 Creating
7. Show that how to find the Voc and Rth in thevenin’s theorem? BTL 1 Remembering
8. Determine the Norton’s equivalent circuit across terminals AB for the circuit BTL 5 Evaluating
shown in figure.
15. How will you convert the current source to voltage source? BTL 1 Remembering
16. Convert the voltage source into current source BTL 2 Understanding
17. Compose the expression for star to delta transformation BTL 6 Creating
18. How will you transform a set of identical resistors connected in Δ to Y BTL 3 Applying
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19. Find the value of the effective resistance between A and B? BTL 1 Remembering
20. Simplify the given Δ network to star connection network BTL 4 Analyzing
PART – B
1. Demonstrate the principle of superposition theorem, find the current in 10Ω BTL 4 Analyzing
resistor of the network shown in figure. (16)
2. Explain the thevenin’s equivalent circuit for the network shown below. BTL 2 Understanding
(16)
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3. Modify the circuit shown in figure, find the current through the 30Ω load BTL 6 Creating
resistor using Norton’s theorem. (16)
4. Define reciprocity theorem and find I3 for the circuit shown below. (16) BTL 1 Remembering
5. Discuss about Superposition theorem and find the current through (2+j5) Ω BTL 2 Understanding
impedance. (16)
6. Infer the current in the load impedance (ZL) using Millman’s theorem (16) BTL 2 Understanding
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7. Find the current through branch a-b using Thevenin’s theorem in the circuit BTL 1 Remembering
shown below. (16)
8. Estimate the load resistance for Maximum power across it as shown in figure. BTL 5 Evaluating
(16)
9. Point out the maximum power transferred to the load ZL in the circuit of figure. BTL 4 Analyzing
(16)
10. If 20V is applied across AB, in the circuit of figure, calculate the total current, BTL 4 Analyzing
the power dissipated in each resistor and the value of the series resistance to
halve the total current. (16)
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11. Solve the following network and find the total current taken from the source. BTL 3 Applying
(16)
12. Produce the expression for Delta to star conversion. (16) BTL 3 Applying
13. In the circuit, six resistors are connected to form Δ and a Y. Find the effective BTL 1 Remembering
resistance between (a) A and B (b) A and N. (16)
14. For the circuit shown in figure, find the equivalent resistance using star-delta BTL 1 Remembering
transformation. (16)
PART – A
Q.No Questions BT Competence
Level
1. What is mean by Resonance? BTL 1 Remembering
2. Define series resonance and draw its circuit diagram. BTL 1 Remembering
3. Write the expression for the resonant frequency of RLC series circuit. BTL 2 Understanding
5. Estimate the expression for maximum energy stored in inductor. BTL 2 Understanding
6. Analyze the frequency response of RLC series and parallel circuit. BTL 4 Analyzing
8. Find the expression for maximum energy stored in capacitor. BTL 1 Remembering
10. A circuit has the resonant frequency of 60Hz and lower half-power BTL 2 Understanding
frequency of 40Hz. Identify its bandwidth?
12. How will you recognize the self inductance in a circuit. BTL 1 Remembering
16. Write the importance of dot rule for coupled coils. BTL 5 Evaluating
17. Draw the frequency response of a single tuned circuits BTL 4 Analyzing
19. Two coupled coils with L1=0.02H L2=0.01H and K=0.5 are connected in BTL 2 Understanding
series aiding arrangement. Predict its equivalent inductance.
20. Construct the expression for effective inductance of two parallel connected BTL 6 Creating
magnetically coupled coils.
PART – B
1. Find the expression for resonant frequency in RLC series circuit. (16) BTL 1 Remembering
Discuss the bandwidth of a series RLC circuit as a function of resonant BTL 2 Understanding
2.
frequency. (16)
Interpret the expression for the following: BTL 3 Applying
3.
(i) Half power frequencies (6)
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For the parallel network shown in figure, identify the value of R for BTL 1 Remembering
resonance.
6.
(16)
Formulate the expression for the resonant frequency for the circuit shown BTL 6 Creating
in figure below. (16)
7.
Examine the relation between self-inductance and mutual inductance of the BTL 4 Analyzing
8.
coupled circuits. (16)
9. How will you evaluate the Conductively coupled coils? (16) BTL 5 Evaluating
Two coils connected in series have an equivalent inductance of 10H. When BTL 4 Analyzing
the connections of one coil is reversed, the effective inductance is 6H. If
10.
the co-efficient of coupling is 0.6, calculate the self-inductance of each coil
and mutual inductance. (16)
Two identical coupled coils in series has an equivalent inductance of BTL 1 Remembering
0.080H and 0.0354H when connected in series aiding and series opposing.
11.
Find the values of the inductance, mutual inductance and co-efficient of
coupling. (16)
12. SCompare the term single tuned circuit with double tuned circuit. (16) BTL 2 Understanding
A
A coil having an inductance of 100mH is magnetically coupled to another BTL 2 Understanding
13. coil having an inductance of 900mH. The coefficient of coupling between
the coils is 0.45. Predict the equivalent inductnace if the two coils are
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connected in i) Series aiding ii) Series opposing iii) Parallel aiding iv)
Parallel opposing (16)
14. Analyze the performance of double tuned circuit. (16) BTL 4 Analyzing
5. BTL 4 Analyzing
Select few applications of RL, RC, RLC circuits.
6. BTL 1 Remembering
Outline natural response.
7. Predict the condition, for the response of RLC series circuit to be BTL 2 Understanding
under damped for step input.
8. A RLC series circuit has R=10 Ω L=2H. State the value of BTL 1 Remembering
capacitance that will make the circuit critically damped.
10. Produce the time constant of RF circuit having R=10 Ω and BTL 3 Applying
L=0.1mH.
11. Give the condition for the response of RLC series circuit to be over BTL 1 Remembering
damped for step input
12. Show the Laplace transform for the unit step function BTL 1 Remembering
14. Formulate the difference between natural and forced response. BTL 5 Evaluating
15. Develop the equivalent circuit at t=0+ for a capacitor with initial BTL 6 Creating
charge of q=0
16. Illustrate the condition for critically damped response of a series RLC BTL 3 Applying
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20. A coil of resistance 2.2 Ω and an inductance 0.01H is connected in BTL 4 Analyzing
series with a capacitor across 220V mains. Identify the value of
capacitance such that maximum current flows in the circuit at a
frequency of 190 Hz and the maximum current.
PART B
Write the step response of RL and RC circuits and State their BTL 1 Remembering
1. performances. (16)
(i)Locate the transient response of a series RL circuit with DC input. BTL 2 Understanding
Sketch the variation of current and the voltage across the inductor (8)
(ii) Distinguish I and V as functions of time in the circuit shown
below. when the switch is closed at time t=0
(8)
2.
A series RL circuit With R=30 Ω, and L=15H has a constant voltage BTL 6 Creating
V=60v applied at t=0 as shown in figure. Assess the current I, the
voltage across resistor and the voltage across the inductor. (16)
3.
Formulate the expression for the current responses of RLC series BTL 5 Evaluating
4. circuit with sinusoidal excitation. Assume that the circuits is working
in critical damping condition. (16)
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Identify the expression for the complete solution of the current BTL 2 Understanding
5. response of RC series circuit with an excitation of V cos(ωt+φ) and
Briefly explain the significance of phase angle in the solution. (16)
The circuit shown in figure consists of resistance, inductance and BTL 2 Understanding
capacitance in series with 100v DC when the switch is closed at t=0.
Predict the current transient. (16)
6.
A RL series circuit excited by a sinusoidal source e(t)=10 sin 100t BTL 1 Remembering
7. volts, by closing the switch at t=0.Take R=10 Ω and L=0.1H. Relate
the current flowing through the RL circuit. (16)
A series RLC circuit with R=100 Ω, L=0.1H and C=100µF has a DC BTL 4 Analyzing
voltage of 200 volts applied to it t=0 through a switch. Illustrate the
expression for the transient current. Assume initially relaxed circuit
8.
conditions. (16)
(i)Describe natural response and transient response (8)
(ii)In the circuit shown in figure, identify the time when the voltage BTL 1
9. Remembering
across the capacitor becomes 25 V, after the switch is closed at t=0. (8)
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12
(i) In the circuit shown in fig, analyze the expression for i(t),VR(t)and BTL 4 Analyzing
VL(t) if the switch is closed at t=0 (8)
13
(ii) In the circuit shown in fig, detect the value of current ‘i’ at
t=50μS if the switch is closed at t=0 and VC(t=0)=0 . (8)
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In the circuit shown, point out the transient current after switch is BTL 4 Analyzing
closed at time t=0, given that an initial charge of 100µC is stored in the
capacitor. Examine the necessary equations. (16)
14
BTL 3 Applying
6. Recall the equivalent T and π models of two port networks BTL 1 Remembering
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BTL 2 Understanding
BTL 3 Applying
PART – B
1. (ii) Measure the h-parameters of the two port network shown in fig. BTL 5 Evaluating
(8)
3. BTL 2 Understanding
(8 marks)
(ii) Demonstrate Y parameters of network shown in fig from Z
parameters. (8)
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6. BTL 2 Understanding
7. BTL 3 Applying
9. BTL 1 Remembering
(16)
(i) Inspect the impedance (Z) parameter of the given two port
network shown in fig. (8)
12 BTL 3 Applying
13 BTL 4 Analyzing
Predict the Z parameters for the networks shown in the figure (16)
14 BTL 2 Understanding