l. The superposition thborem can only be applied to circuits that are
fil) linear. (3) nonlinear. (5) inverted.
(2) bilateral. (4) unilateral.
2. ln the circuit of Fig. 84 find the currenr through R, by the superposition method. (Hint: Fig. 60)
(l) /r : 4.16 A (3) /r = 0.375 A
(2) I,: 0.416 A (4) It = 3.75 A
Rl
30n
R2
25.n
20v
n
Fig. 84
3. In the circuit of Fig. 84 find the current
tion method.
(1) /3 : 1.16 A
(2) It = 0.116 A
(1) analogs of each other.
* (2) duals of each other.
5. In the circuit shown in
minalsaandbis
{ XXXXXXXXXXmhos. (4)
7. Given the values in Question 6, what
circuit of Fig. 8(bX
XXXXXXXXXXmho XXXXXXXXXXmho
dd XXXXXXXXXXmho (4) 3 mho.s.
4 : 0.021 A
/s = 0.883 A
through fts by the superpo$r-
(s XXXXXXXXXXA
(3) equivalent to each other.
(4) variations of each other.
Fig. 85, the total conductance between ter2.1 mhos XXXXXXXXXXrnhos.
2.14 mhos XXXXXXXXXXmhos.
(3)
(4)
4. Kirchhoffs current law and Kirchhoffs voltage law are
\ t'lh+F'6
Fig. 85
6. The voltage source in Fig. 86 has the parameter values E, = 12 V and
R" : 40. What is the value of the equivalent current source {r?
(1) r.2 A X(3) 3 A (s) 12 A ,.
(2) 2A (4)4A (6)4FA t
is the conductance G, in the
o't+ D'V+
O'N
t'
,6,v
..NIE
)
(5) 4 mhos
(6) 25 mhos
8. If the current source shown in Fig. 8(b) has the value I, : 14 A and if
G, : 0.2 mho, what is the value of the equivalent constant-voltage
source E" in Fig. 8(aX
v1
I
v
lrL
' (o)
l ,
.ry h
I
'*'
tY, o'L"l
""(ru
Fig. 86
XXXXXXXXXXv
XXXXXXXXXXv
XXXXXXXXXXv XXXXXXXXXXv
(4) 7 v y(6) 70 v
9. Given the values in Question 8, what is the value of R" in Fig. 86(a)?
(l XXXXXXXXXX
XXXXXXXXXXo XXXXXXXXXXo
J 10. In the circuit of Fig. 87 which of the following equations is not
correct? (Hint: check by using 15v battery and 10o resistors)
*5)t(
Sl'(l) Iz: Ir - It ($ f
:
*
,r\ 12 R3 ') E: I,
, E _ I,R
(5) 1: :
u -'t^'t 9 '
r12
(4) I' _
E - /rRr -,
R3
R1 " i0P
\6{ t to)L
Fig. 87
Jtt. Figure 88 shows the equivalent circuit of an FET amplifier. What is
the output voltage Eo of this stage? (Hint: Topic l)
(t) G^EG, 6 %ES Ups*U2 *(rffi
In the circuit of Fig. 88, what is the current through
tance G1?
t2. the load conduce-- EG ^\
V--'Y'S b5 t hL)
!"nL'''
/ ,^
121',) r
Fig. 88
13. In the circuit of Fig. 89(a) furd the current through R3 with the switch in
position 1. Assume a perfect diode (zerc forward resistance and infrnite
back resistance). (Hint: See exarnple 2 in Topic 16. Short out the 60V
supply and find the current through R3, observing the polarity. Next,
short out the 40V supply and again find the current, noting the direction.)
+
(I) Zero
(2) 0.2s mA
(3) 0.7s mA
lokn 30 krI
+60 V -4OV
1r7,.rz!G"
17y GtG^Eo,
\-" Gt * Gos
rJ/ E:ffi
(4\ G tEe
,
\'/ G^ * Gt + Gog
,
f.t, ^rt
tr4ffi1
\J) v2n6r{JDS
(6) G^GrGo, {\Y h
5ko
2 7.5 kfr
o-^AA+-2Ov
I
-40 v
R3
Fis. 89
14. In the circuit of Fig. 89 (b) find the current through the 5-kcl fesis!9r with the
switch in positioni. lchoot".your answer from the choices givenfor
Question 13.)
84
15 mA
d-c
Fig.93 '
Questions 17 to 19 refer to Fig. 93.
17. What value of current flows through R5? (tlint: Topic 16 example 3)
(1) 6 mA XXXXXXXXXXmA (s) 33 mA
(2) 12 mA XXXXXXXXXXn1A XXXXXXXXXXmA
18. What is voltage .E o?
(i) -3.e v (4) {.6 v
XXXXXXXXXXV XXXXXXXXXXV
XXXXXXXXXXV XXXXXXXXXXv
XXXXXXXXXXV
XXXXXXXXXXv
i9. How much power is dissipated on Rr?
XXXXXXXXXXmW XXXXXXXXXXmW XXXXXXXXXXmw XXXXXXXXXXmW
Questions 20 to 23 rcfer to Fig. 94. (Hint App. Ex. 11, problems 1 and 2)
20. What is the value of curent flowing through R1?
(1) 0 mA XXXXXXXXXXmA (s) 660 mA
XXXXXXXXXXmA XXXXXXXXXXmA XXXXXXXXXXmA
21. What is the direction of curent through R,?
(1) Downward *(2) Upward
Rt =5 n'
6V
R+=2o nRz =lOO
E -
f(2) UPward
Rz =lo n'
Rs=20 n'
Fig.94
22. Whatis the current through ^Rr? (I) 0 mA XXXXXXXXXXmA
@ ls mA @) 3rs mA
(s) 6ts mA
XXXXXXXXXXmA
23. What is the rtiqection of current through ^Rr? g (t) Downward (t- U;**d
k