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CONFIDENTIAL EE/OCT2010/ELE413

UNIVERSITI TEKNOLOGI MARAFINAL EXAMINATION

COURSECOURSE CODEEXAMINATIONTIME

CIRCUIT ANALYSIS IIELE413OCTOBER 20103 HOURS

INSTRUCTIONS TO CANDIDATES1 . This question paper consists of Eleven (11) questions.

Answer ALL questions in the answer booklet. Start each answer on the new page..3. Do not bring any material into the examination room unless permission is given by theinvigilator.

Please check to make sure that this examination pack consists of:i) the Ques tion Paperii) an Answ er Booklet - provided by the Faculty

DO NOT TURN THIS PAGE UNTIL YOU ARE TOLD TO DO SOThis examination paper consists of 6 printed pages Hak Cipta Universiti Teknologi MARA C O N FI D E N TI A L

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CONFIDENTIAL 2 EE/OCT2010/ELE413

QUESTION 1Figure Q1 shows a network of impedances in an electric circuit. By using any suitable methodfind the total impedance with respect to terminal a-b and calculate the current i x marked in thefigure below.

J10Q2 0 Q . 15Q

to a -MOQ

30 sin 500t + 65 V (QJ) -J15f> ,

| j 15Q

_ L 3j10Q

Figure Q1 (8 marks)

QUESTION 2Mesh Analysis involved analyzing voltage in a loop. Find the voltage Vx in the circuit in FigureQ2 below.

J10Q

-j15Q=i= 3Z45A

Figure Q2 (12 marks)

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QUE S TION 3By using Nodal Analysis, f ind vol tage Vi, V 2 and V 3 in the circuit in Figure Q3

1Z-9WA

V2

J1Q

IZ90A-e-1Q

V-1Q" A A A / | V l

f U 1 0 Z 0 F z^z-jlQ

Figure Q3 (12 marks)

QUE S TION 4Find ^ using Supe rposi t ion The orem for the circui t show n in Figure Q4. Given V s(t) = 55 sin(200t + 50) V and ls( t) = 10 cos (200t + 50) A

(t> -7"4Q:12 QAA/V 8QAAAn

v.ni -j6QFigure Q4 (9 marks )

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Q U E S T I O N 5By referr ing to the circuit in Figure Q5, obtain the Y-parameter of the 2 port network.

l i ^ Y n ^ + Y ^ V al 2 = Y 2 l V i + Y 2 2 V 2

11 1 0 QAA/V

16 QAA/V1 6Q

10Q

1 2 QAA/V10 V,

Figure Q5 (9 marks)

QU EST ION 6The method of Super Posi t ion Theorem involv ing analyzing one act ive independent source at at ime and upon complet ion of al l the analysis, the sum of any parameter wil l be calculated inorder to get the f inal value of i t . Upo n turning off any indep ende nt voltage and current sourc e,the connection between the circuit elements wil l change. By referr ing to the circuit given inFigure Q6, ident ify al l the circuit elements that wil l be omitted for analysis and give yourjust i f icat ion upon doing it .

R a

R bAAAr

R e

R fR dAAAr

R e-Wv 1

6sFigure Q6 (6 marks)

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QUESTION 7For the circuit shown in Figure Q7, find A i,A v,Z j andZ 0

[Z ] = 12 - 8- 6 14

95V20QA A A y -V v v

11+Vl

[Z ]

>?+V2

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