Question

Y (t) = x (t/5) is _______

(a) Compressed signal

(b) Expanded signal

(c) Time shifted signal

(d) Amplitude scaled signal by factor 1/5

I got this question by my school teacher while I was bunking the class.

I'm obligated to ask this question of Basic Operations on Signals in section Signals and Systems Basics of Signals and Systems

Answer 1

Right answer is (b) Expanded signal

To explain: y (t) = x (at), comparing this with the given expression we get a = 1/5. If 0<a<1 then it is expanded (stretched) version of x (t).