Networks Analysis and Synthesis - Engineering

Q1:

Consider the following from the point of view of possible realization as driving point impedances using passive elements
Among these

A 1, 2, 4 are realisable

B 1, 2, 3 are realisable

C 3, 4 are realisable

D none is realisable

ANS:B - 1, 2, 3 are realisable

In realisable functions degrees of numerator and denominator can differ by a maximum of 1.