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1 EE 4 (RR) Total No. of Questions :09] [Total No. of Pages : 03 II/IV B.Tech. DEGREE EXAMINATIONS, APRIL/MAY- 016 Second Semester ELECTRICAL & ELECTRONICS NETWORK ANALYSIS Time: Three Hours Answer Question No.1 Compulsory Answer ONE question from each Unit 1. a. Write the expression for power in 3 phase Delta load? Maximum marks:70 14X1=14 M 4X14=56 M b. What is the power factor of load when two wattmeters show equal reading? c. Write the applications of KUL method? d. Define pole and zero e. Define Network function? f. Define hybride parameter of two port network? g. What is co-efficient of coupling? h. Define image parameters. i. Draw the magnitude plot of high pass filter? j. What are the advantages of m-derived filter? k. Write the General expression for cauer second form? l. Draw lattice network? m. Laplace transform of () t n. What is Fourier series expansion UNIT-I. a. Explain Relation ship between line and phase voltages and current in star connection? Draw phasor diagram. b. A balanced 3-phase load draws 8 kw at a lagging p.f. of 0.8. If the line voltage applied is 440w. Find the complex power and line current? 3. a. Explain procedure to measure 3 phase power using wattmeter method? Also comment on reading variation according power factor of load? b. A delta connected load has impedance of Z j10, Z 10 O Z j10. If the load be connected across a three phase 440V supply, obtain the line currents? UNIT-II 4. a. Explain about restriction on location of poles and zeros in driving point functions? 1 RY YB BR P.T.O

2 I s b. A current transfer function is given by domain response. 5s.Obtian its time ( s )( s s ) 5. a. Find the h-parameters of fig (1) and draw equivalent h-parameter model. b. Derive ABCD parameter interms of y-parameters? UNIT-III 6. a. Derive an equation for pulse Response of series RL circuit in Laplace form b. In a series LC circuit, a 50 V DC applied at t=0. Find the voltage across the capacitor at t=. Assume zero initial conditions in circuit elements? 7. a. Derive an expression for step response of series RLC circuit in laplace domain considering initial zero conditions? b. A two mesh network shown in Fig.(). Obtain the expression for I 1 (s) and I (s), when switch is close t=0. Assume zero initial conditions. UNIT-IV 8. a. Write a note on m-derive filters and their applications? P.T.O

3 b. Find the conductively coupled equivalent circuit of fig(3). 9. a. Find out the given function F() s 4 3 s s 6 s 3 s 6 is a Hurwitz polynomial or not? b. Synthesize the network having driving point impedance in the first cauer form? z() s s s s 4 s 4s 3 3

4 EE 4 (CR) Total No. of Questions :09] [Total No. of Pages : 03 II/IV B.Tech. DEGREE EXAMINATIONS, APRIL/MAY- 016 Second Semester ELECTRICAL & ELECTRONICS NETWORK ANALYSIS Time: Three Hours Answer Question No.1 Compulsory Answer ONE question from each Unit 1. a. Write the equation for the convertion from Delta to star? b. Define Polyphase system? c. What are the advantages of 3 phase system? d. Draw lattice network. e. Define ABCD parameters and symmetrical condition? f. What is network function? g. State inverse h-parameters? h. Obtain the laplace transform of 8(1-t) i. Write the Relation between Z and Y parameters. j. Write general expression for foster second form? k. What is Band pass filter? l. Define co-efficienct of coupling m. Sketch the response of RC series circuit step response? n. What is Fourier series. UNIT-I. a. Write the advanatages of three phase system? Maximum marks:70 14X1=14 M 4X14=56 M b. The phase impedance of a delta connected load is (15+j0). What is the line current if applied line voltage is 00V? Obtain the amount of power consumed per phase. What is phasor sum of the three line currents? 3. a. Derive the expression for impedances in star to Delta transformation for a unbalance 3 phase load? b. A three phase 400V load has a power factor of 0.4. Two watt meters are connected to measure power. If the input power be 10 kw, find the reading of watt meters? 1 P.T.O

5 UNIT-II 4. a. Find the poles and zero location of the current transfer function ratio I I1 in the circuit shown in fig(1) in S-domain b. Derive an expression for pulse response of RL circuit in Laplace domain? 5. a. For the circuit shown in fig(). Obtain the current through the capacitor at t 0 following switching at t=0. Assume the capacitor to be initially discharged. b. Find VC () t and I 1 () t in the circuit of fig(3) assuming zero initial conditions P.T.O

6 UNIT-III 6. a. An attenuator has shown in Fig(4) find the Y-parameters and draw the equivalent Y- parameter circuit. b. Derive ABCD parameters is terms of Z-parameters. 7. a. Explain different symmetric properties in Fourier series? b. Obtain the exponential Fourier series of the wave form shown in fig (5) UNIT-IV 8. a. Compare constant K and m-derived filters? b. Fig(6) represents a coupled coil circuit where L 1 =0 mh, L =50 mh. If the co-efficient of mutual induction is 0.8, find the value of mutual inductance and write down the mesh equation in time domain. 9. a. Test the given function f () s s 3 s 3 s 4 s s 1 is Hurwitz polynomial or not b. An impedance function is given by z() s ( s 1)( s 3) ( s )( s 4) find the R-L representation of Foster first form of network? 3

7 EE 4 (RR) Total No. of Questions : 09 ] [ Total No.of Pages : 03 II/IV B. Tech. DEGREE EXAMINATIONS, DECEMBER Second Semester ELECTRICAL & ELECTRONICS NETWORK ANALYSIS Time : Three Hours Maximum Marks : a) Define Real and Reactive Power. b) What is independent sources. Answer Question No. 1 Compulsory. 14x1=14 M Answer ONE question from each Unit. 4x14=56 M c) Define impedance and admittance. d) What are the unit of admittance? e) State Millman's theorem. f) What are poles and zeros? g) State inverse transmission parameters. h) Define Q-factor. i) Define Band width. j) Draw the step response of RL series circuit. k) Write the relation between z and h parameters. l) Draw the frequency response of Band pass filters. m) Write Foster first form of RC circuit. n) Draw Foster second form of RL circuit. UNIT - I. a) Explain the measurement of power and power factor of a balanced three phase load using two-wattmeter method? b) Determine the time current for the unbalanced Delta connected load as shown in figure(1). If the phase sequence is (i) R - Y - B (ii) R - B - Y. P.T.O.

8 EE 4 (RR) 3. a) Derive relation between line and phase voltage of a Delta connected 3 system. b) The input power to a 3 load is 10kw at 0.8pf. Two wattmeters are connected to measure the power. Find the individual reading of the wattmeters? Also determine power, power factor of meters at which both shows equal reading? UNIT - II 4. a) Derive an expression for impulse response of series RC circuit? b) In the circuit shown in figure () the switch has been closed for a long time and is opened at t = 0. Find V C (t) for all time intervals. 5. a) Write a note on Restrictions on pole and zero locations? b) In the network of fig (3) find V V C. Also find the pole and zero locations? UNIT - III 6. a) Derive the Z-parameters interms of h-parameters?

9 b) Find the transmission parameter matrix of fig (4). EE 4 (RR) 7. a) Explain the Trignometric form of Fourier-series with examples? b) Find the fourier series expansion of the given waveform. UNIT - IV 8. a) Write about single tuned and double tuned circuits? b) Find the input impedance of the circuit in Fig (6) and the current from the voltage source. 9. a) Find the Range of value 'm' in P(s), so the P(s) is Hurwitz polynomial. Assume P(s) = s 4 +s 3 +ms +s+. b) Derive the General expression for Caurs forms of RC circuits? 3

10 EE 4 (CR) Total No. of Questions : 09 ] [ Total No.of Pages : 03 II/IV B. Tech. DEGREE EXAMINATIONS, DECEMBER Second Semester ELECTRICAL & ELECTRONICS NETWORK ANALYSIS Time : Three Hours Maximum Marks : a) Define power and energy? Answer Question No. 1 Compulsory. 14x1=14 M Answer ONE question from each Unit. 4x14=56 M b) State the applications of Millman's method? c) Define branch, tree and twig? d) Write the expression for star to delta transformation? e) Explain step response of series RLC Network? f) Define complex power? g) What is Network Function? h) What is the relation between z-parameters and y-parameters? i) State two restrictions on pole and zero locations for driving point functions? j) Define Self and Mutual Inductance? k) Draw the Lattice Network? l) Write the expression for Foster first form? m) Define Q-factor. n) What is Low pass and High pass filters? UNIT - I. a) Explain various advantages of 3-phase system over 1-phase system? b) 3-, 4-wire, 100V (L-L) system supplied a balancedy connected load having impedances o of Ω in each phase. Find the line currents and draw the phasor diagram. How much current is flowing through the Neutral? 3. a) Explain the variation in Wattmeter reading with respect to load power factor in Twowattmeter method? b) A 3-, Y-connected load has a Inductor of 500mH and capacitance of 100 F in each phase. The load is connected across 0V, 50Hz, 3- balanced system. Find the line currents for the load? P.T.O.

11 EE 4 (CR) UNIT - II 4. a) What are Impedance and Admittance Functions in the circuit shown below, write in complex frequency domain. b) Derive an expression for impulse response of a series RLC circuit using Laplace Transform method? 5. a) Find the driving point admittance of the network shown in figure. Also draw Pole-Zero plot? b) Explain Time domain behaviour from the Pole-Zero plots. UNIT - III 6. a) Obtain transmission parameter of the Network shown in figure.

12 b) Derive the relation between h-parameters and z-parameters? EE 4 (CR) 7. a) Write a note on properties of Fourier - Analysis? b) Obtain Fourier series of the given wave form shown in figure? UNIT - IV 8. a) Derive an expression for coefficient of coupling of a coupled circuit? b) Explain frequency response of band pass filters? 9. a) Write the properties of Hurwitz polynomial? b) A driving point function is given by s F(s) s 6s 8 4s 3 Show that the function can be realized in both the Cauer RC and RL Forms? 3

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