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(ELEC101)[2010](s)midterm1~1788^_10274.pdf
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DEPARTMENT OF ELECTRONIC AND COMPUTER ENGINEERING
HONG KONG UNIVERSITY OF SCIENCE OF TECHNOLOGY
ELEC 101(L2) BASIC ELECTRONICS
Quiz #1

19:00 -20:00 16 March 2010 LT-B

Name: Student No. : D~partment :
Questions Maximum Scores Scores
1 15
2 15
3 18
4 15
5 15
6 22
Total 100

1.
Answer all questions in the space provided.

2.
This is a closed book examination. No additional sheet is allowed.

3.
Show all your calculations clearly. No marks will be given for unjustified answers.

4.
Do your own work. Any form of cheating is a violation of academic integrity, and will be dealt with accordingly.


1

1. Find Vo in the below circuit using nodal analysis (node voltage analysis). Find the power delivered by the 6A current source.

I( L ,
/ Va f 3 _~o Vo + 3
1/:/
-
t -+ -6-0
b 2.--
if
'-)
I -,-
Ilia 0 VJ
-
Po.,.v " rAeJ,'ve.ru
--. (6)l~)= FJ
-.......

2

2. Use mesh analysis to find 10 in the below network.
----..10


1 ") -l?-:;: /



.-L ---([,) ( ~) -f-Cf"J -l r ) Cr) :: 0

--r$)
?lA I' f", fJ1 e<;[J } d-Jr/~ 2
(r, -l~ )Cf) -t If + C -[$) (2<) :;:-0


3

3. Use the principle of superposition to find the voltage Vo in the below circuit. lA

4V
10
+1
2V
2A 40
l'-~'f~~

' t.p
(!) cD
~61
2~ l.(-. ~l i 'f ~.....-: ...
~ G2-Y'0 110~;; (~~i)C{)
V. I /-1-If
~I ::. 0, If
V ~l. ::. ,-()r~ V
Q j 1 @ I
I
rlf c5!J~
1 eo~ =tr
~, -f Lf ) C~) (~ 1)
f+ t.f' '
Va) -1,6 V Vo, ~O

4

4. Use source transformation to find the voltage Vo in the below circuit.
2!l O.3!l

+
SV
O.S!l
Vo


-----:.----f

5

5. Find the voltage Vo in the below circuit.
...------1 .-1--------.
1A
+ Vo_
3Q
2Q 1Q
2V
~--~+ I~--~
/(c L
~ 5t.Afler~.;
-/ + Vo 11: -2
D
-;:2. T-I 0
~
zV
[0 -/
6

6. (a) Find the Thevenin and Norton equivalent with respect to the terminals a, b for the below circuit. I.e. Find VTH, RTH and IN, RN.
1----0 a
~------~--------~--------~b
1---4 \J.---..-_--J
(0
PI'! '; (/.,
g:!JLJ
7

(b)
Draw the Thevenin and Norton equivalent circuits at below.

(c)
When a load resistor of RL is connected between the terminals a and b, what is the value of RL will give a maximum power dissipation at the load? Find the value of the maximum power dissipation at the load.


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