### Two-Port Networks - Topicwise GATE Questions on Network Theory (from 2003)

2003
1. The impedance parameters Z11 and Z12 of the two port network in figure are

2004
2. For the lattice circuit shown in figure, Za = j2Ω and Zb = 2Ω. The values of the open circuit impedance parameters (Z-parameters) are

2005
3. The ABCD parameters of an ideal n:1 transformer shown in figure are given below. The value of 'x' will be

a) n
b) 1/n
c) n2
d) 1/n2

4. The h-parameters of the circuit shown in figure are

2006
5. A two port network is represented by ABCD parameters as shown below. If port-2 is terminated by RL, the input impedance seen at port-1 is given by

6. In the two port network shown in the figure below, Z12 and Z21 are respectively

2008
A two port network shown below is excited by external DC sources. The voltages and the currents are measured with voltmeters V1, V2 and ammeters A1, A2 (all assumed to be ideal), as indicated. Under following switch conditions, the readings obtained are:

7. The Z-parameter matrix for this network is

8. The h-parameter network for this network is

2010
9. For the two-port network shown below, the short-circuit admittance parameter matrix is

2011
10. In the circuit shown below, the network N is described by the following Y matrix: The voltage gain V2/V1 is

a) 1/90
b) - 1/90
c) - 1/99
d) - 1/11

2012
Common Data for Questions 11 and 12:
With 10 volts DC connected at port A in the linear nonreciprocal two-port network shown below,

the following were observed:
(i) 1Ω connected at port B draws a current of 3 amps
(ii) 2.5Ω connected at port B draws a current of 2 amps
11. With 10 volts DC connected at port A, the current drawn by 7Ω connected at port B is
a) 3/7 A
b) 5/7 A
c) 1 A
d) 9/7 A

12. For the same network, with 6 volts DC connected at port A, 1Ω connected at port B draws 7/3 amp. If 8 volts DC is connected to port A, the open circuit voltage at port B is
a) 6 V
b) 7 V
c) 8 V
d) 9 V

2014
13. In the h – parameter model of 2 – port network given in the figure shown,

the value of h22 (in siemens) is _____________

14. For the two – port network shown in the figure,
the impedance (Z) matrix (in Ω) is

2015
15. The 2 – port Admittance matrix of the circuit shown is given by____________

16. The ABCD parameters of the following 2 – port network are

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