Basics of two port network

Q. The DC voltage gain $\frac{V_0}{V_i}$ in the following circuit is given by

1. $A_v\frac{R_2}{R_1+R_2}$
2. $A_v\frac{R_1}{R_1+R_2}$
3. $A_v\frac{R_2}{R_1+R_2}+R_0$
4. $A_v$

Q. For transfer function of a physical two-port network:

1. All the zeros must lie only in the left half of the s-plane
2. The poles may lie anywhere in the s-plane
3. The poles lying on the imaginary axis must be simple.
4. A pole may lie at origin.

Q.

For a 2-port network consisting of an ideal lossless transformer, the parameter $S_{21}$ (rounded off to two decimal places) for a reference impendance of $10\Omega$, is

1. 0.8