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Name__S4 bution Student No.
ECE 201 Exam 2 March 21, 2011
Write your numerical answer in the boxes or lines provided. Remember to include
units with answers as appropriate.
Closed book, closed notes.
Check for all pages, 6 including this cover.
1. /20 Practice Exam 2
2. /20
3. /20
4. /20
5. /20
Total = /100
E(name): VCVS
Fame): CCCS
G(name): VCCS
H(name): CCVS
Green
. Use the superposition principle in this circuit to find cm
the requested variable. You must use the method of —\/\- 9
superposition to receive credit on this problem. Wy bx
a) Draw the circuit so as to determine the 3V on ar
contribution to ix just due to the current source. |
Determine that contribution.
oR
ay
ye ' ‘4q &
x ; —T 124 -
an ws Uy, + 2% Wet Ty o Q
ixr= 0.8%
b) Draw the circuit so as to determine the contribution to ix just due to the voltage
source. Determine that contribution.
én
ey
av ga byy 2 AX = wrA
IP
= oD A
¢) Use your results from part a and part b to determine the current iX for the circuit
at the top of the page.
\
by tly, hye FIA
ix= 1A
4) The two parts to this problem are independent.
a) Find vo and io. Show steps leading to the
answer. Take vs = 1.2 V.
b) The first line and last line of a SPICE
text input file for this circuit are
provided. Print the 5 lines in between.
Each line will be marked correct or
incorrect based on whether they would
function correctly if typed exactly as you
write it. Take p= 2.
EXAM 2 QUESTION
END
vo=
Oy"
| I .
E
y+
N
a
3 | x
a I
° i x
2
Lo A
oO
5. For each of the question parts below, choose the best answer and show the work used
to arrive at the answer. Work that justifies the answer is required for credit.
a)
b)
c)
Aone port linear circuit is represented by a Thévenin equivalent circuit with a Vr
=5 V and Rr = 50 ohms. A load resistor, Ri is connected to the output port. The
maximum power that can be delivered to Ri is 5 watts and this
occurs when Ri = . (Fill in the blanks with a numerical value.)
A one port linear circuit voltage produces 10 V to an open circuit load and
delivers 8 V to an 8 ohm resistor load. The voltage delivered to a 2 ohm resistor
would be: [1; 2; 3; 415) 6; 7; 8; 9; 10] volts. Choose the best answer, showing
how you arrive at it.
A certain network contains two sources and a large number of resistors, one of
which is designated Ri. Measurements at Ri show that it receives 20 watts when
only the first source is active and 80 watts when the second source is active. The
power it receives when both sources are operating is: [100; 120; 140; 160; (80)
200] watts. Choose the best answer, showing how you arrive at it.
