Communication Systems - Engineering

Q1:

In a phase discriminator fc, is the IF to which primary circuit is tuned. Consider the following statements: The primary and secondary voltages are
  1. exactly 90° out of phase when input frequency is fc
  2. more than 90° out of phase when input frequency is higher than fc
  3. less than 90° out of phase when input frequency is lower than fc
Which of the above statements is correct?

A 1 only

B 1 and 2

C 1, 2 and 3

D 2 and 3

ANS:A - 1 only

No answer description is available.