NETWORK ANALYSIS I
NETWORK ANALYSIS I ECE 220
U of L
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This 11 page Class Notes was uploaded by Wade Davis PhD on Friday October 23, 2015. The Class Notes belongs to ECE 220 at University of Louisville taught by Staff in Fall. Since its upload, it has received 63 views. For similar materials see /class/228376/ece-220-university-of-louisville in Electronics and Computer Technology at University of Louisville.
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Date Created: 10/23/15
ECE 220 Network Analysis I Final 08F 424 Points Name You may use one sheet of notes and your calculator Fill in the blanks circle the correct answer etc 1 25 Find the resistance between A and B The answer is an integer 132 0 A 3012 on Ln A LQ e 1037 1 851 2 25 Find the impedance between C and D Q Ila ml 3 32 Find the Vt for t 0 t 0 andt 00 Whatis the time constant for t gt 0 150 em 41on JWV T Ark Tiau T va 4 30 A 14KW machine 78PF lagging a 12 KW lighting load and a 4 KVAR capacitor are connected across a 110V AC line What is the line current feeding the 3 devices 5 40 V 50 cos 40t 37 volts Vms v f Hz Vavg v Period S V max v Average power consumed in me v a 59 resistor connected to this Vlmdpm ak v voltage source w Vtl v 6 10 2 should be 0 for thi A 5 54 maximum power to be consumed in 22 should be 2 for the 4 maximum power to be consumed in the 5 3 laquot V z j6 impedance 7 20 1 IJ l 3 29 39 8 9quot 641 a VAVA J 200v 395 A The answer is an integer 8 20 I Z A The answer is an on On integer Wm 39 I 541 4 1 WV 1 6 a V 3 9 30 it A use phasors loo as Votsn quot m WM Va 13 L 10 20 7 57 Draw the Thevenin equivalent circuit 0 A L 20V 30 1 4m 11 30 5 quot D 50 M Find an expression for it JE X xisz 1 oov 806 DJL VW 12 10 How much energy is consumed in 2 A minutes How many electrons pass through the circuit in 2 minutes IOn 9mmquot 13 5 A capacitor has a stripe on it as shown What does the stripe mean 14 35 15 24 594 A uquot Aida 3 75ft j 393 M quot 1 0 16 18 t in VAVAVA39 Write a sufficient number of equations to solve for all the mesh currents in this circuit Do not solve The initial voltage across the capacitor is zero VR V VLt V Vct V Circle the nodes in the circuit at left in such a way that there are as few distinct nodes as possible How many KCL equations are needed for the circuit How many KVL equations are needed 17 25 The op amp is ideal Find V0 333 m 18 25 A 3phase power distribution system with a line voltage of 600 V is connected to a 10 KVA Y connected machine with a power factor of 079 lagging Find the total power delivered to the load the line current and the phase current of one phase of the load ECE 220 NETWORK ANALYSIS I FINAL 098 265 Points Name You may use one sheet of notes and your calculator Fill in the blanks circle the correct answer etc 1 20 309 Find the resistance between A and B The A 6L 1 l gg answer is an integer ISZ 2380 727 Qv W b 5 510 2 5 If there are 22 essential nodes in a network you need KCL equations 3 5 A circuit with 17 meshes requires KVL equations 4 10 KO L 50 wmnzt 393 L V MN MFT 30V 6 10 50 V loV UL CJL 9J1 7 20 A black box with 2 leads sticking out of it is known to contain only DC sources and resistors The short circuit current is found to be 6A The current through a 109 resistor is found to be 4A Sketch the Thevenin equivalent circuit for the black box 8 5 A certain device stores 180000 J of energy How much is that in KwHrs 9 5 The voltage across an cannot be changed instantaneously 10 20 A 3phase deltaconnected generator is connected to a balanced Y connected load Each phase of the generator has a voltage of 200V Each phase of the load has an impedance of 15 j 18Q Find the total power consumed by the load 11 20 The switch is closed at t0 0 Find Vt for t gt 0 NJ 305 9391quotquot 39 5MF7120 l m 12 40 i 100 cos 40t 20 A Imax 1min Iavg Ipcak to peak NW7 8 HEH II II A 02 If this current were to ow through a 59 resistor the average power consumed would 13 20 9 00quotquot H Find Vt Assume that the voltage across the capacitor is zero at t O Simplify your answer 2on 14 W r r L isideal 4 39 Dis6V 39 kg 20 kg 30 kQ50 kg 80 kg 100 kg Capacitors available 1pF5 pF 10 pF 9V 15 20 A motor connected to a 220 V 1ine consumes 40 KVA with apowerfactor of 062 lagging A 20 KVAR capacitor is also connected across the line Findthe cunent in the line feeding the two devices 16 15 Find 7so that the J 90 2 maximum pgwer is consumed in Z NL QSEOO N J30 17 15 Find V