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Model 1

This document contains a model test paper for the subject Circuit Theory for first year second semester students. It has two parts - Part A contains 10 multiple choice questions worth 2 marks each. Part B contains 5 numerical problems worth 16 marks each. The test is for 3 hours and carries a maximum of 100 marks. Some example questions in Part A include defining a node, junction and branch. Part B involves calculating currents, powers, resonant frequencies and quality factors for various RLC series and parallel circuits.

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Raja pandiyan
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140 views13 pages

Model 1

This document contains a model test paper for the subject Circuit Theory for first year second semester students. It has two parts - Part A contains 10 multiple choice questions worth 2 marks each. Part B contains 5 numerical problems worth 16 marks each. The test is for 3 hours and carries a maximum of 100 marks. Some example questions in Part A include defining a node, junction and branch. Part B involves calculating currents, powers, resonant frequencies and quality factors for various RLC series and parallel circuits.

Uploaded by

Raja pandiyan
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
Available Formats
Download as DOCX, PDF, TXT or read online on Scribd
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Er.

PERUMAL MANIMEKALAI COLLEGE OF ENGINEERING


DEPARTMENT OF ELECTRICAL AND ELECTRONICS ENGINEERING
MODEL TEST-I (Set-I)
YEAR/SEM : I / II Max Marks: 100
SUB : CIRCUIT THEORY HOURS : 3 Hrs

PART-A
ANSWER ALL THE QUESTIONS 10*2=20
1. What is a node, a junction and a branch

2. Compare series and parallel circuit.

3. State Super Position Theorem

4. State current division rule.

5. Compare series and parallel resonance circuits.

6. Define Q factor of a coil.

7. Mention the relationship between Q-factor and bandwidth

8. Define Series Resonance

9. What is meant by parallel resonance?

10. Draw the frequency response of R-L circuit and explain.

PART-B (16*5=80)
11.A) Determine the current supplied by each battery in the circuit shown in figure using mesh
analysis.

OR
B) Determine the power dissipation in the 4 ohm resistor of the circuit shown in figure.
12. A) Using superposition theorem find the current IL and the power consumed by 23 ohm
resistor in the circuit shown in figure.

OR
B) Derive the expression for Star to delta conversion.
13. A) A series RLC circuit with R=10 ohms, L=10 mH, & C=1 micro farad has an applied
voltage of 200 V at resonant frequency. Calculate the resonant frequency, the current in the
circuit and voltages across the elements at resonance. Find also the quality factor and the
bandwith.
OR
B) Compute Q of the series RLC circuit with R=10 ohms, L=0.04 H, & C=1 micro farad. Find
bandwith, resonant frequency, and half power frequencies.
14.A) A series RLC circuit with R=5 ohms, L=40 m H, & C=1 micro farad. Find the Q of the
circuit, the separation between half power frequencies, the resonant frequency and the half power
frequencies.

OR
B) A series RLC circuit consists of 50 ohm resistance, 0.2 H inductance and 10 micro farad
capacitance with the applied voltage of 20 V. Determine the resonant frequency, Find the q
factor of the circuit, Compute the lower and upper frequency limits and also find the bandwidth
of the circuit.
15.A) Obtain the expression for the resonant frequency for the circuit shown in figure.

OR
B) For the circuit shown in figure, determine the value of C at which it resonates when f=100 Hz.
Er. PERUMAL MANIMEKALAI COLLEGE OF ENGINEERING
DEPARTMENT OF ELECTRICAL AND ELECTRONICS ENGINEERING
INTERNAL TEST-I (Set-III)
YEAR/SEM : I / II Max Marks: 100
SUB : CIRCUIT THEORY HOURS : 3 Hrs

PART-A
ANSWER ALL THE QUESTIONS 10*2=20

1. Define Ohms Law.


2. Mention the disadvantages of Ohm’s Law
3. In the circuit find the maximum power transferred.

4. Write the formula for star to delta transformation


5. When do you say that a given AC circuit is at resonance?
6. Write the significance of quality factor.
7. Write the condition of resonance.
8. Define band width of a resonant circuit.
9. Draw the series resonance circuit and the phasor diagram
10. Draw the parallel resonance circuit and the phasor diagram.

PART-B (16*5=80)
11 A) Find the current through the 8 ohms resistor shown in figure

OR
B) Use mesh analysis to determine the three mesh currents in the circuit figure shown in figure.
12. A) For the circuit shown in figure, determine the equivalent resistance by using Star –delta
transformation.

OR
B) Determine the Thevenin’s equivalent circuit of the network given. Also find the current
through a 100 ohm galvanometer connected across AB.
13. A) A series RLC circuit with R=20 ohms, L=2.5 mH, & C=1 micro farad has an applied
voltage of 200 V at resonant frequency. Calculate the resonant frequency, the current in the
circuit and voltages across the elements at resonance. Find also the quality factor and the
bandwith.
OR
B) Compute Q of the series RLC circuit with R=40 ohms, L=0.08 H, & C=2 micro farad. Find
bandwith, resonant frequency, and half power frequencies.
14.A) A series RLC circuit with R=10 ohms, L=80 m H, & C=1 micro farad. Find the Q of the
circuit, the separation between half power frequencies, the resonant frequency and the half power
frequencies.
OR
B) The circuit shown in figure is resonant at a frequency of w=5000 rad/sec. Find the value of L.
15.A) Obtain the expression for the resonant frequency for the circuit shown in figure.
OR
B) For the circuit shown in figure, determine the value of C at which it resonates when f=100 Hz.

Prepared by Verified By
Er. PERUMAL MANIMEKALAI COLLEGE OF ENGINEERING
DEPARTMENT OF ELECTRICAL AND ELECTRONICS ENGINEERING
INTERNAL TEST-I (Set-III)
YEAR/SEM : I / II Max Marks: 100
SUB : CIRCUIT THEORY HOURS : 3 Hrs

PART-A
ANSWER ALL THE QUESTIONS 10*2=20

1. Define kirchoffs Voltage law


2. Define ‘Mesh analyses of a circuit.
3. What is the limitation of superposition theorem?
4. Define source transformtion.
5. What do you understand by damped frequency?
6. What are half power frequencies?
7. What is Bandwidth and sel ctivity?
8. State the properties of a series RLC circuit.
9. A Series resonance circuit has a bandwidth of 20 KHz and a quality factor of 40. The
resistor value is 10Kohm. Find the value of L of this circuit.
10. Define quality factor in the resonant circuit

PART-B (16*5=80)
11.A) In the circuit of figure1, find the current through RL.

OR
B) What is the voltage across X & Y in the circuit shown in figure

12. A) In the circuit of figure six resistors are connected to form delta and a star. Find the
effective resistance between (a) A and B (b) A and N.

OR
B)Find the Thevenin’s equivalent circuit across the terminals A and B for the network shown in
figure.
13. A) A series RLC circuit with R=10 ohms, L=10 mH, & C=1 micro farad has an applied
voltage of 200 V at resonant frequency. Calculate the resonant frequency, the current in the
circuit and voltages across the elements at resonance. Find also the quality factor and the
bandwith.
OR
B) Compute Q of the series RLC circuit with R=10 ohms, L=0.04 H, & C=1 micro farad. Find
bandwith, resonant frequency, and half power frequencies.
14.A) Find the value of L at which the circuit resonates at a frequency of 1000 rad/sec in the
circuit shown in figure.

OR
B) Derive the expression for RLC parallel Circuit & Magnification.
15.A) Obtain the expression for the resonant frequency for the circuit shown in figure.
OR
B) For the circuit shown in figure, determine the value of C at which it resonates when f=100 Hz.
Prepared By Verified By

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