University of Mumbai 2008-4th Sem B.E Electrical and Electronics Engineering Electrical Networks - Question Paper
Electrical Networks Sem IV May 2008
-UU-9709
[Total Marks: 100
[I1L.VUI.U uuunej
(3 Hours)
N.B.; (1) Question No. 1 is compulsory.
(2) Solve any four questions out of remaining six questions.
(3) Figures to the right indicate full marks. -
1. "(a) Find the Laplace transform of non-periodic function shown in figures - 20
*t
(o) Find the z-parameters in terms of h-parameters.
(c) Test whether the following function is Hurwitz Polynomial.
(d) Using Laplace transform find the expression for i(t) In the netwoifc given if switch is closed at t s 0.
2. (a) Two networks are shown in diagram. Obtain the transmission parameters of the resulting 10 circuit when both the circuits are cascade.
|o -ft -Va-
to
o-WV
SSi-
\V &- )0-ri
<rj
r
% lo-*-
-o
CO
(b) In the circuit shown in figure below, switch K is opened at t = 0. Find the expression 10 for the o/p voltage V0(t). Use Laplace transform.
I
Con. 3270-C0-9709-08.
,T*trxe? firz-'U/r tn-cV'- rr~-r
3. (a) Check whether the following functions are positive real - ? M
10
s + 3
0) F(S)
S + 5s + 6
2sa + 2s2 + 3a + 2 s2 + 1
<) F(e) =
(} Derive the conditions for reciprocity and symmetry of the circuit in terms of z-parameters. 10
4. (a) Find the network functions rrr t. t* and for the network shown in figure. 10
vt *1 S
A. p I.
t oi n.rzrv,<x>
t
M
i
o-
- _
(b) The network shown has zero initial conditions. A voltage Vt) - 6(1) applied to two 10
[-21 -311 e + e" J, What should be V,(t) to give
v0(t) = 1 e-.
5. (a) Find the Fourier series of the wavelorm shown - 10
(b) Determine Vc(t) use Fourier transform -
10
t
cC
I
6. (a) Realise the Foster forms of the foilowing RC impedance function -
10
10
2(s + 2)(sf4)
M ' (8f1) (St3)
(b) Find the Caver forms ol the following RL impedance function -
2(s + 1) (s + 3)
z(s)
<8 + 2) (s * 6)
7. Write short notes on (any two)
(a) Odd function and Even function as regards to Fourier series
(b) The complex Treavency plane
i*a uuui ii..i ._____
20
Attachment: |
Earning: Approval pending. |