EE205: Electric Circuits II (092)

Others

Homework-assignments      Exams

Notes & Summary

Computer Assignments

Common Mistakes

Alsalam Alaikum wa Rahmat Allah

Dear EE205-Student,

Welcome to EE205. I pray Allah that you find this course very useful and enjoyable. An excellent start is needed.

This page serves my students in all semesters. It contains model exams, projects,...etc . Some material may be found through WebCT.

Best regards,

Dr. Ali Muqaibel

EE205 -092 Class

# Others

Course Syllabus-092_v1

# Homework assignments  092

 HW# Practice Assignment Problems Solution HW Problems to be submitted Due Date 1 HW1  Ch 11 Three Phase Circuits, (Word File) All Practice Problems Tuesday, Week 3 2 HW2  Ch 8, Natural and Step Response of RLC Circuits (pdf) HW2 (pdf) Tuesday Week 5 3 Handout:  Chapter 7:State equation and computer aided analysis  6, 9, 21, 25,38, 40 HW3 (pdf) Sunday, Week 7 4 Handout: Chapter 10: Resonant Circuits: 23, 26, 27, 33 HW4 (pdf) Tuesday, Week 9 5 Handout Chapter 10:     40, 42 , 50 , 53, 54 HW5 (pdf) Sunday, Week 10 6 Chapter 6: 34, 36, 38a, 44,45,46 (8th Edition) Chapter 9: 72, 73,75,77  (8th Edition) (if you do not have the 8th edition click here to get the questions) Sol HW6 HW6 (pdf) Sunday, Week 12 7 Chapter 14: 14.3, 14.6, 14.8, 14.15, 14.20 and 14.25 (7the edition) Sol HW7 HW7 (pdf) 8 Chapter 18:  18.3, 18.9, 18.10, 18.11 and  18.12 (7th edition) Sol HW8 HW8 (pdf)

# Exams

 Material Solution 082 Solution 092 [11.1-11.3] Balanced Three Phase Circuits Q1 ver 1 , Q1 ver 2 [11.4-11.6] Power Measurements & Calculations in Three Phase Chapter 8: Natural and Step Response of RLC Circuits Q3 Ver 1& 2 Quiz 2 092 Ch11, Ch8, and (Ch7 from the handout) M1 Solution M1 Solution 18.8/30 which is 62.7 %. Computer Aided Circuit Analysis (Handout Ch 7) Quiz 3 Resonance Frequency Quiz 4 S-Domain Analysis; Pole-Zero Plot Q5 ver1 ,      ver2 Ch 10 (Handout), Ch6+Ch9 (Mutual Inductance and Linear transformers) M2 Solution M2 Solution Mutual Inductance and transformers Quiz 5 Filters and Bode Plots Q6 Solution Quiz 6

## Exams 031

 Exam# Material Solution Q1 [11.1-11.4] Sec01 , Sec02 Q2 [11.5-11.6] Sec01 , Sec02 Q3 [8.1-8.2] Sec01 , Sec02 Q4 [8.3-8.5] Sec01 , Sec02 M1 Ch8, Ch11, and (Ch7 from the handout) Exam,  Solution Q5 Resonant Circuits (Handout 10.3, HW#6) Short Sol., Long Sol. Q6 Complex Frequency (S-Domain) Sec01 , Sec02 Q7 Mutual Inductance (6.4,6.5, HW#8) Sec01 , Sec02 M2 Ch 10 (from handout), Ch 6 & Ch 9 Exam & Solution Q8 Filters and Bode plot (HW#10) Sec01 , Sec02 Q9 Filters and Bode plot F Final Exam

# Notes & Summary

 # Material Related External Links 1 Chapter 11: Balanced Three-Phase Circuits V2.1 (pdf) Fundamentals of Electric Circuits by Alexander and Sadiku  : Balanced Three Phase Tutorial (CH12) and others (practice) 2 Chapter 8: Response of RLC Circuits 3 Ch7 Handout (Full) Ch7 Handout (Summary v2.1), (pdf) In Class Group Practice (pdf) 4 Chapter 10 Handout (Full) Ch10 Handout (Summary: Resonance and Quality Factor) (pdf) 5 Ch 10 (Summary: Complex S-domain Analysis) (pdf) Explore the S-Domain 6 Ch6 & Ch9 Mutual Inductance and Transformers (pdf corrected ver. 2.0) Transformers (Wikipedia) Transformer Java Example 7 Bode Plot Practice Problem 1 Practice Problem 2 SemiLog Paper Generating Program (click here to download) (Visit this Website) Rules for Making Bode Plots 8 Two port networks (properties: reciprocity and symmetry, ppt) 9 Summary of Main ideas in the course (pdf)

# Projects

 # Project Title Solution Due Date 092 Computer Aided Circuit Analysis Matlab Links Tuesday , May 15, 2010 082-1 Computer Aided Circuit Analysis Sat., May 30, 2009 031-1 Mon., Nov. 10, 2003 031-2 Sat., Jan. 3, 2003

# Common Mistakes:

These are some common mistakes.... if you find additional common mistakes send them to me to list them. This way  we can avoid them and make them less common

1) Analysis of Balanced Three Phase Circuits

• Mixing angular frequency (rad/sec) with frequency in (Hz). Do not forget to do the proper transformation.

• Remember that adding or subtracting 360 degrees does not change the angle. (240 is equivalent to -120). Also when using the calculator do no forget to make sure that it is set properly to radians or degrees.

• When asked to find the three phase voltages or currents, do not forget to find the values for the other two phases.

• cos is used as a reference with angle zero. If sin  is used it has to be converted to sin if need be. sin x= cos (x-90).

• Line Voltages (VAB,VBC,VCA or Vab,Vbc,Vca) does not equal to voltage drop across the line (VaA, VbB, VcC). This is a very common mistake.

• If the frequency is negative do not forget to do the proper change on the angle.

• When using the equation for complex power, the conjugate is usually forgotten.

• If the total power is given do not forget to divide by 3 to draw the single phase.

• If the load is given as delta, you need to divide by three to draw the single phase equivalent.

• If the complex power is give as P+j Q, we cannot directly represent this as resistance and inductance !

2) Natural & Step response of Series and Parallel RLC Circuits

• alpha for series is different than alpha for parallel circuit. It is very common to mix them.

• When finding the type of response it is very common to compare mega^2 with alpha.. You should compare omega with alpha.

• After finding the constant in the response you should assign it to the proper exponent (or expression). It is very common to write A1 in place of A2 and so on.

3)

• For Q = 2π

Remember that the maximum energy stored is measured after summing W(t)C & W(t)L not individually and do not forget 2π.

• Q is measured at resonance.
• When finding the power lost in R do not forget 1/2 if I is an amplitude value.
• For impedance scaling :

R'=kmR            L'=kmL             C'=C/km           ωr'= ωr             BW'= BW

• For frequency scaling :

R'=R                L'=L/kf             C'=C/kf            ωr'=kf ωr           BW'= kf BW

• Do not mix up the symbols of poles "X" and zeros "O" in pole-zero plot.
• For the total energy stored in coupled coil

w(t)=1/2 L1 i12(t) + 1/2 L2 i22(t)  M i1(t) i2(t)

there is no 1/2 before M.

Here is a nice one