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Solved Problems-9

Problems-9
A network has two input terminals ab and two output terminals cd. The input impedance with c-d open-circuited is (250 + j100) ohm and with c-d short-circuited is (400 + j300) ohm. The impedance across c-d with a-b open-circuited is 200 ohm. Determine the equivalent T-network parameters.
Solution
For c-d Terminals opened,
 
Description: Description: 5911.png(i)
 
But, for c-d terminals shorted,
 
Description: Description: 5917.png(ii)
 
Again, with a-b terminals opened,
 
(ZB + ZC) = 200 (iii)
 
From (ii) and (i), we get,
 
Description: Description: 5923.png
 
or Description: Description: 5929.png{by (iii)
 
or Description: Description: 5937.png
 
Description: Description: 5943.png
 




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