# | - [NT] EE 201 NETWORK THEORY KTU B TECH QUESTIONS FOR SECOND YEAR [S3] STUDENTS | QUESTION BANK

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**APJ ABDUL KALAM TECHNOLOGICAL UNIVERSITY**

**NETWORK THEORY**

**QUESTION PAPERS**

1. State Kirchoff’s law.

2. The resistors that are connected in series the values are R1=15Î©, R2=Î©, and R3=Î©. The

current is 0.2A. Determine the Voltage drop across the each resistor and the total voltage.

3. State maximum power transfer theorem.

4. Convert the given star to equivalent delta. Having the values of Ra = 1KÎ©, Rb = 5KÎ© & Rc = 100Î©.

5. Two inductively coupled coils have self inductance L1=45 mH and L2=150 mH. If the co-

efficient of coupling is 0.5 (i) find the value of mutual inductance between the coils and

(ii) what is the maximum possible mutual inductance?

6. Define coupled circuits.

7. Write 2 properties of Laplace transformations.

8. Define transient state and transient time.

9. Draw the phasor diagram of power factor measurement in three phase circuits.

10. Give the relation connecting the power factor angle with two wattmeter leading?

Part – B (16*5=80Marks)

11. A wheat stone bridge circuit is made up of the following resistors AB=3Î© BC=6Î© and CD=15Î© and DA=7Î© .A 30 V battery is connected between A&C.

Find the current through a 10Î© galvanometer connected between B&D using loop method.

or

12. i) Three parallel connected resistors that a total supply current of 3mA have values of 10kÎ©, 12kÎ©, and 15kÎ©.

Convert the resistance values into conductance, and determine the individual branch currents.

ii) Find the Equivalent resistance and the current in each resistance.

13. Find the current through 3 ohms resistor by using superposition theorem.

or

14. For the circuit shown in the fig below, find I3 and verify reciprocity theorem.

15. A parallel RLC circuit with R=10Î©, L =10 mH & C=1Mf has an applied voltage of 200 V at resonant frequency.

Calculate the resonant frequency, the current in the circuit and the voltages across the elements at resonance. Find also the quality factor and bandwidth.

or

16. Write a short note on analysis of single and double tuned coupled circuits.

17. A series RL circuit with R=100Î© & L=20H has a dc voltage of 200V applied through a switch at t=0 find

a) the equation for the current and t=0 find

b) the equation for the current and voltages across the different elements,

c) the current at t=0.5 seconds,

d) the current at 1 sec.

Or

18. For the circuit shown in figure. Determine the current when the switch is closed at t=0.

Assume zero charge on the capacitor initially.

(ii) Give the short notes on symmetrical component and un-symmetrical component.

or

20. The power flowing into a balanced three phase inductive load measured by the 2

wattmeter method are 200 W and 1000 W. the line voltage are 400V, 50 Hz. Determine the total power, KVA and the power factor of the load.

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