B there must be either a zero or a pole at origin and

(B)
There must be either a zero or a pole at origin and infinity.
(C) The highest (or lowest) powers of numerator or denominator differ by
unity.
(D) All of the above.
Ans: D
Q.13 The current
x
i in the network is:
2
1
4
With the voltage source of 3v only, the current
'
x
i is
A i
x
15
3
9 6
3
'
=
+
=
With the current source of 2A only, the current
"
x
i
is
A i
x
15
12
15
6
2
9 6
6
2
"
= × =
+
× = .
Thus, by Superposition principle, the current
x
i through the resistance
Ω 9
is
A A i i i
x x x
1
15
15
15
12 3
15
12
15
3
" '
= =
+
= + = + =
Q.14 The equivalent circuit of the capacitor shown is
Q.15 The value of
 



1

AE-08 CIRCUIT THEORY AND DESIGN
Ans: D
2
max
I
I
rms
=
For the given wave form A I 1
max
=
The value of
















max
max
max
1
.
2
I
I
is
I
I
rms
=
2
1
2
1
.
2
1
= .
Q.16 The phasor diagram for an ideal inductance having current I through it and voltage V across it
is :
(A) (B)
(C) (D)
Ans: D
5
Q.17 If the impulse response is realisable by delaying it appropriately and is bounded for bounded
excitation, then the system is said to be :
Q.18 In any lumped network with elements in b branches,
( ) ( )
, 0 t i . t
k
b
1 k
= υ
∑
=
for all t, holds good
according to:
k
Q.19 Superposition theorem is applicable only to networks that are:
Q.20
In the solution of network differential equations, the constants in the complementary
function have to be evaluated from the initial conditions, and then the particular integral is
to be added. This procedure is
(A) correct.

AE-08 CIRCUIT THEORY AND DESIGN
(B) incorrect.
(C) the one to be followed for finding the natural response.
(D) the one to be followed for finding the natural and forced responses.
Ans: A
Q.21 Two voltage sources connected in parallel, as shown in the Fig.1, must satisfy the conditions:
≠ .
if
6
Q.22 The rms value of the a-c voltage
( )
t 314 sin 200 t v = is:
V
V
V m
RMS
42 . 141
44 . 1
200
2
200
2
= = = =
Q.23 In a 2-terminal network containing at least one inductor and one capacitor, resonance
condition exists only when the input impedance of the network is:
Q.24 If a network function has zeros only in the left-half of the s-plane, then it is said to be
(A) a stable function. (B) a non-minimum phase function.
(C)
a minimum phase function.
(D)
an all-pass function.
Ans: C
Q.25 Zeros in the right half of the s-plane are possible only for