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Exam Questions Papers - Engineering

Q1:

If . dt, then F[y(t)] is

A - jsgn(f). x(f)

B j2pf . e-jptf . x(f)

C

D

ANS:A - - jsgn(f). x(f)

⇒ F{Y(t)} = Y(f) = X(f) x sin (t) ⇌ By duality :⇌ sgn + (- f) ⇒ ⇌ jsgn (- f) ∴⇌ - j sgn (f) ∵ sgn(- f) = - sgn(f) ⇒ Y(f) = X(f). [- j sgn(f)].