**2005**

1. The first and Last critical frequency of an RC driving point impedance function must respectively be

a) a zero and a pole

b) a zero and a zero

c) a pole and a pole

d) a pole and a zero

**Solution :**https://www.youtube.com/watch?v=noq2x3cDycY

**2006**

2. The first and the last critical frequencies (singularities) of a driving point impedance function of a passive network having two kinds of elements, are a pole and a zero respectively. The above property will be satisfied by

a) RL network only

b) RC network only

c) LC network only

d) RC as well as RL networks

**Solution :**https://www.youtube.com/watch?v=L4AUTybSCjk

3. A negative resistance R

_{neg}is connected to a passive network N having driving point impedance Z

_{1}(s) as shown below. For Z

_{2}(s) to be positive real,

**Solution :**https://www.youtube.com/watch?v=ESM5mIZBEeU

**2008**

4. The driving point impedance of the following network is given as shown. The component values are

**Solution :**https://www.youtube.com/watch?v=CI2Na_stYRg