Question

When two, two-port networks are connected in series, then

• A. Z parameters are added
• B. Y parameters are added
• C. H parameters are added
• D. ABCD parameters are multiplied

Hint:

Series Connection \(\implies\) Add Z-parameters.
Parallel Connection \(\implies\) Add Y-parameters.
Cascade Connection \(\implies\) Multiply ABCD-parameters.

Answer 1

The Correct Option is A

When two-port networks are interconnected: 

Series Connection: The overall Z-parameters (Impedance parameters) are the sum of individual Z-parameters. \( [Z_{\text{total}}] = [Z_A] + [Z_B] \). 
Parallel Connection: The overall Y-parameters (Admittance parameters) are the sum of individual Y-parameters. 
Cascade Connection: The overall ABCD-parameters (Transmission parameters) matrices are multiplied. 
Series-Parallel Connection: The overall H-parameters (Hybrid parameters) are added.

For a series connection, Z parameters are added:

\[ \boxed{\text{Z parameters are added}} \]