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Questions on Electrical Circuits - Midterm Exam 3 | EE 261, Exams of Microelectronic Circuits

Material Type: Exam; Professor: Inan; Class: Electrical Circuits; Subject: Electrical Engineering; University: University of Portland; Term: Fall 2003;

Typology: Exams

Pre 2010

Uploaded on 08/18/2009

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University Jf PJrtland
SchJJl Jf Engineering
EE 261-Electrical Circuits-3 cr. hrs.
Fall 2003
Midterm Exam # 3
(Monday, November 24, 2003, 1:35p.m.)
(Closed Book Exam, Three Formula Sheets are Allowed)
(Total Time: 55 minutes)
Name:_______________________J
Signature:___________________ J
An honest mind possesses a kingdom.
Lucius Annaeus Seneca (4B.C.65A.D.)
Honest people are the true winners of the universe.
Anonymous
pf3
pf4
pf5

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Download Questions on Electrical Circuits - Midterm Exam 3 | EE 261 and more Exams Microelectronic Circuits in PDF only on Docsity!

University J f P J rtland

Sch JJ l J f Engineering

EE 261-Electrical Circuits-3 cr. hrs.

Fall 2003

Midterm Exam # 3

(Monday, November 24, 2003, 1:35p.m.)

(Closed Book Exam, Three Formula Sheets are Allowed)

(Total Time: 55 minutes)

Name:_______________________ J

Signature: ___________________ J

“ An honest mind possesses a kingdom. ”

Lucius Annaeus Seneca (4B.C.−65A.D.)

“ Honest people are the true winners of the universe. ”

Anonymous

NOTE: On all the problems, please show your work clearly, and

provide the appropriate units for your answers. Also mark on the

schematic to show any current or voltage that you define in your

solution.

1. (Total: 30 Points) Consider the circuit shown below.

300 Ω i 100 Ω 36 mH 6-18 u ( t ) (mA) (^150) Ω

(a) (5 points) Find the value of i ( t = 0 −).

(b) (5 points) Find the value of i ( t = 0 +).

(e) (10 points) Write the complete mathematical expression for i ( t ) and

sketch i ( t ) over the time interval − 1 ms≤ t ≤ 1 ms. Provide all the

appropriate time and current values on your sketch.

i ( t ) (mA) t (ms)

2. (Total: 40 Points) Consider the second-order circuit shown below

where the switch is closed at t = 0 , after being open for a long time.

3 V (^) vC 5 nF t = 1 kΩ 4 kΩ 20 mH 2.2 kΩ

(a) (15 points) Find the roots of the characteristic equation of the circuit

and determine the type (over-damped, critically-damped, or under-

damped?) of the natural response vC ( t ) across the 5-nF capacitor for

t ≥ 0.

(b) (5 points) Based on part (a) results, write the general mathematical

expression for the voltage vC ( t )valid for t ≥ 0.

3. (30 Points) For the sinusoidal steady-state circuit shown, given the

source voltage and current in phasor form as V S = 4. 5 ej^0 V,

  1. 13 o S 0.^03 I = ej A, and given the impedance ( 50 50 )

Z 1 = − j Ω, find the

value of the impedance Z 2.

V S I S Z 1 Z 2