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Electronics & Communication System - Signal Systems

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13.

The Fourier transform of unit impulse function is

A.	1	B.	0
C.	S	D.	1/S

14.

If ‘θ’ is the angle between two vectors then dot product of the two vectors contains the term

A.	cosθ	B.	sinθ
C.	tanθ	D.	secθ

15.

The continuous time LTI system is causal if

A.	h (t) = 0 for t = 0	B.	h (t) = 0 for t > 0
C.	h (t) = 0 for t < 0	D.	h (t) = 1 for t < 0

16.

The Fourier transform of the exponential signal ejωt is

A.	a constant	B.	a rectangular gate
C.	an impulse	D.	a series of impulses

17.

The auto-correlation function of a rectangular pulse of duration T is

A.	a rectangular pulse of duration T	B.	a rectangular pulse of duration 2T
C.	a triangular pulse of duration T	D.	a triangular pulse of duration 2T

18.

The system characterized by the equation y (t) = ax (t) + b is

A.	Linear for any value of b	B.	linear if b > 0
C.	Linear if b < 0	D.	Non-linear

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