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Communication Systems - Engineering

Q1:

Consider the following
  1. A signal f(t) and its Hilbert transform fh(t) have the same energy density spectrum
  2. A signal f(t) and its Hilbert transform, fh(t) have the same auto correlation function
  3. A signal f(t) and its Hilbert transform are mutually orthogonal
Which of the above are true?

A 1, 2 and 3

B 1 and 2 only

C 1 only

D 2 and 3 only

ANS:A - 1, 2 and 3

All are correct.