Networks Analysis and Synthesis - Engineering

Q1:

Consider the following
If a network has impedance (1 - j) at a specific frequency, the circuit would consists of series
  1. R and C
  2. R and L
  3. R, L and C
Which of these statements is correct?

A 1 and 2

B 1 and 3

C 1, 2 and 3

D 2 and 3

ANS:D - 2 and 3

RC circuit has impedance of the form (1 - j). Moreover R, L, C circuit can also have impedance of the form 1 - j if XC > XL.