0
Circuits and Transmission Lines : Question Paper May 2015 - Electronics & Telecomm (Semester 3) | Mumbai University (MU)

Circuits and Transmission Lines - May 2015

Electronics & Telecomm. (Semester 3)

TOTAL MARKS: 80
TOTAL TIME: 3 HOURS
(1) Question 1 is compulsory.
(2) Attempt any three from the remaining questions.
(3) Assume data if required.
(4) Figures to the right indicate full marks.


1 (a) Determine y-parameter for the network. (5 marks)


1 (b) The constants of a transmission line are R=6Ω/km, L=2.2 mH/Km.G=0.25×10-6 ℧/km, C=0.005×10-6 F/km.
Determine the characteristics impedance, propagation constant and attenuation constant at 1 KHZ.
(5 marks)


1 (c) Test if F(S)=2S6+4S5+6S4+8S3+6S2+4S+2 is a Hurwitz polynomial. (5 marks)


1 (d) The current I(S) in network is given by $$ I(S) = \dfrac {2(S)} {(S+1)(S+2)}. $$ Plot the pole-zero pattern in the S-plane and hence obtain i(t). (5 marks)


2 (a) Find the current through 10Ω resistor using Norton's theorem. (10 marks)


2 (b) Find the current i(t) for t>0. (10 marks)


3 (a) Find Foster I and Foster II forms of the driving points function: $$ F(S) = \dfrac {S^3 + 9S^2 + 23S + 15 } {S(S^3+ 12S^2 + 44S + 48)} $$ (10 marks)


3 (b) Determine ABCD parameters of the network shown: (10 marks) 4 (a) A transmission line has a characteristics impedance of 150 Ω and terminated in a load ZL=75 - J100&Omega. Using switch chart, find
i) VSWR
ii) Reflection coefficient
iii) Input impedance at a distance 0.1λ from the load.
iv) location of first voltage maximum and first voltage minimum from the load.
(10 marks)


4 (b) Find I2 using mesh analysis. (10 marks)


5 (a) For the network shown, capacitor C has an initial voltage VC(-0) of 10V and at the same instant current in the inductor L is zero. The switch is closed at time t=0. Obtain the expression for voltage V(t) across the inductor L. (10 marks)


5 (b) For the network shown, determine $$ \dfrac {V1} {I_1} \ and \ \dfrac {V_2} {I_1} $$ . Plot the poles and zeros. (10 marks)


6 (a) For the network shown, find the equivalent T-network. (10 marks)


6 (b) Derive condition for reciprocity in terms of Z parameters and symmetry in terms of h parameters. (10 marks)

0  upvotes

Next up

Read More Questions

If you are looking for answer to specific questions, you can search them here. We'll find the best answer for you.

Search

Study Full Subject

If you are looking for good study material, you can checkout our subjects. Hundreds of important topics are covered in them.

Know More