Assignment

Batch: 2010 - 2014

VINAYAKA MISSIONS UNIVERSITY Vinayaka Mission’s Kirupananda Variyar Engineering College

SALEM – 636 308 Semeste

Programme

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B.E. BIOMEDICAL ENGINEERING

3

Subject Code & E347N303 – CIRCUITS AND NETWORKS Name Mr.Mathan Kumar.S Name of the Tutor 1 Assignment. No. Date of 22 – 07 – Date of 11 – 07 – 2011 Announcement 2011 Submission Two (or) Three lines explanation / Short Answer / Short Calculation

PART – A

1. State Kirchhoff’s law. 2. Write the classification of circuit element with examples. 3. What is meant by network? 4. Define ideal voltage and current source. 5. What is a DC and AC excitation? 6. What is meant by active and ive element? 7. Write the basic concept of series and parallel circuit. 8. Compare series and parallel circuit. 9. Give two applications of both series combination and parallel combination. 10.

What are the disadvantages of series circuit?

11. Draw the phasor diagram for RL and RC series circuit. 12.

What are the advantages of parallel circuits with applications?

13. Draw the symbolic representation of the voltage source and current source.

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Assignment

Batch: 2010 - 2014

14. Give the voltage and current equation for an AC through pure capacitance & inductance. 15. Draw the phasor diagram and waveform for a purely capacitive circuit & resistive circuit. 16. What is circuit? 17.

What is power factor and reactive factor?

18. A coil having a resistance of 20Ω and inductance of 0.25H is connected across 200V and 60Hz supply. Calculate the current. 19.

What is an impedance triangle?

20.

For the purely resistive circuit excited by sinusoidal varying

voltage, what are the phase angle and power factor? 21. For the purely inductive circuit supplied by sinusoidal varying voltage, what is the phase relation between current and applied voltage. How are applied voltage and induced emf? 22.

Two resistances of 1.5Ω and 3.5Ω are connected in parallel and

this parallel combination is connected in series with a resistance of 1.95Ω. Calculate the equivalent resistance value. 23. A voltage divider circuit of two resistors is designed with total resistance of the two resistors equal to 50Ω. If the output voltage is 10% of the input voltage, obtain the values of the two resistors in the circuit. 24.

Two capacitors C1 & C2 are connected in series if C1 = 10µF and

equivalent capacitance is 1.67µF. Find C2. 25.

Define apparent and reactive power.

26.

State Current division and Voltage division rule.

27.

Define source transformation.

28.

What is impedance?

29.

Two inductors with equal value of “L” are connected in series

and parallel. What is the equivalent inductance?

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Assignment 30.

Batch: 2010 - 2014

Two inductors with equal value of “C” are connected in series

and parallel. What is the equivalent capacitance?

PART – B

Descriptive ( Essay Type)

1. Briefly explain i)

Kirchhoff’s law

ii)

Series and parallel circuit

2. Find the Equivalent resistance and the current in each resistance. 3

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3. i) Derive the total inductance formula for two inductances are connected in parallel. ii) Derive the total resistance formula for three resistances are connected in parallel. 4. A 50Ω resistor and a 75mH inductor are connected in series across a 400V, 50Hz supply. Find the impedance of the circuit, voltage across the resistor, voltage across the inductor, apparent power, active power and reactive power.

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Assignment

Batch: 2010 - 2014

5. i) Two resistors are connected in parallel and a voltage of 240V is applied to the terminals, the total current is 15A and the power dissipated in one of the resistor is 2000W. What is the resistance of each element? ii) A 200W, 220V bulb is put in series with a 150W, 220V bulb across a 440V supply. What will be the current draw? What will be the power consumed by each bulb? Will such combination work? 6. Derive the current and power expression of AC through pure Resistance and Capacitance.

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Assignment

Batch: 2010 - 2014

7. A 50Hz alternating voltage a 240V (rms) is applied independently to the Resistance of 75Ω

i)

ii) Inductance 0.75H

iii) Capacitance of

75µF. Find the expression of the instantaneous current in each case and draw phasor diagram in each case. 8. Explain the concept of “voltage division” and “current division” in an electric circuit with an example. 9. i) A bulb is rated at 220 V, 400W. Find the rated current, resistance of the filament and the energy consumed when it is operated for 15 hours. ii) An incandescent lamp is rated for 100V, 200W using suitable resistor how you can operate this lamp on 220V mains. 10. i) A coil having a resistance of 40Ω and inductance of 0.75H forms part of series circuit, if the supply voltage is 250V, 50Hz. To Find the a) line current b) Power factor c) Voltage across the coil. ii) Derive the total capacitance formula for three capacitances are connected in Series. 11.

Derive the impedance and power expression of AC through

Series R-L Circuit. 12. A coil having a resistance of 8Ω and inductance of 32mH is connected to 230V, 60Hz supply. Calculate the a) Inductive reactance

b)

Impedance

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Assignment c) Express impedance in polar form

Batch: 2010 - 2014 d) Phase angle

e) Power

factor f) Power 13.

Derive the impedance and power expression of AC through

Series R-C Circuit. 14. Derive the current and power expression of AC through pure Inductance and also draw a V – I characteristics curve. 15. A capacitor having a capacitance of 50µF is connected in series with a non-inductive resistance of 150Ω across 240V, 60Hz. Calculate the current, power and phase difference between current and supply voltage.

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